Bio
Bruce Macintosh's research focusses on the study of extrasolar planets, in particular the study of such planets through direct imaging, and on using adaptive optics to shape the wavefronts of light for a variety of applications. Direct imaging of extrasolar planets involves blocking, suppressing, and subtracting the light of the bright parent star so that a planet hundreds of thousands of times fainter can be seen and studied in detail. Prof. Macintosh is the Principal Investigator of the Gemini Planet Imager http://planetimager.org/ ,an advanced adaptive optics planet-finder for the Gemini South telescope,. He also leads a Science Investigation Team for the coronagraph instrument on the WFIRST mission, focused on imaging and spectroscopy of extrasolar planets. He serves as Deputy Director of the Kavli Institute for Particle Astrophysics and Cosmology https://kipac.stanford.edu/
Professor Macintosh believes strongly in making astronomy and physics more inclusive, diverse and supportive. He currently chairs the Physics Department's Equity and Inclusion Committee https://physics.stanford.edu/about/equity-and-inclusion/committee and is active in science policy including the recently-completed Astronomy and Astrophysics 2020 Decadal Survey.
Professor Macintosh has taken the position of Director of University of California Observatories at UC Santa Cruz and is currently on a 0% appointment at Stanford.
Administrative Appointments
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Deputy Director, Kavli Institute for Particle Astrophysics and Cosmology (2018 - Present)
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Professor of Physics, Kalvi Institute for Particle Astrophysics and Cosmology, Department of Physics, Stanford University (2013 - Present)
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Associate Director for High-Contrast AO, National Science Foundation Center for Adaptive Optics (2005 - 2009)
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Physicist, Applied Physics Section, Physics Division Lawrence Livermore National Laboratory (2001 - 2014)
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Physicist, Institute of Geophysics and Planetary Physics Lawrence Livermore National Laboratory (1997 - 2001)
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Postdoctoral Researcher, Institute of Geophysics and Planetary Physics Lawrence Livermore National Laboratory (1994 - 1997)
Honors & Awards
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Physics Directorate Award for Outstanding Postdoc Mentoring, LLNL (2013)
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Elected Fellow, SPIE (2011)
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Newcomb Cleveland Prize for best paper published in Science, American Association for Advancement in Science (2010)
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Science and Technology award for outstanding research, LLNL (2010)
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Science and Technology Directorate award for excellence in publication, LLNL (2009)
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Most significant paper in adaptive optics, OSA (2004)
Boards, Advisory Committees, Professional Organizations
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Member, National Research Council ASTRO2020 Decadal Survey Steering Committee (2019 - Present)
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Member, National Academy of Sciences Exoplanet Science Strategy Committee (2018 - 2019)
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Member, National Academy of Sciences Committee on Astronomy and Astrophysics (CAA) (2015 - 2019)
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Member, National Academy of Sciences Committee on progress of the 2010 Decadal Survey (2015 - 2016)
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Member, Scientific Organizing Committee, Sagan Exoplanet Summer Workshop (2014 - 2014)
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WFIRST Science Definition Team and Formulation Science Working Group Member, NASA (2013 - Present)
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Convener, Thirty Meter Telescope Exoplanet International Science Development Team (2013 - 2018)
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Member, Program Committee, “Adaptive Optics Systems and Applications” 2012 SPIE Astronomical Instrumentation (2012 - 2012)
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Fellow, SPIE (2011 - Present)
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Conceptual Design Reviewer, LSST Camera Systems (2011 - 2011)
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Member, Program Committee, “Techniques for detection of exoplanets” 2011 SPIE Optics and Photonics (2011 - 2011)
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Member, NASA Exoplanet Analysis Group Executive Committee (2010 - 2012)
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Panel Member, National Research Council ASTRO2010 Decadal Survey: Program Prioritization Panel on Ground Based Optical/IR (2009 - 2010)
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IRIS Science Team Member, Thirty meter Telescope (2008 - Present)
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Program Committee Member, “Adaptive Optics Systems and Applications” SPIE Astronomical Instrumentation (2008 - 2008)
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Astronomy and Astrophysics Advisory Committee member, Exoplanet Task Force (ExoPTF) (2007 - 2008)
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Member, NASA APRA Review Panel (X-ray) (2007 - 2008)
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Member, European Southern Observatory Very Large Telescope SPHERE planet finder (2007 - 2008)
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Member, Giant Segmented Mirror Telescope Science Working Group (2007 - 2008)
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Scientific Organizing Committee Member, Spirit of Lyot conference (2007 - 2007)
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Member, Keck Next Generation AO System Science Team (2006 - 2010)
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Member, Gemini Adaptive Optics Working Group (2006 - 2009)
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Narrow-field IR AO System Conceptual Design Reviewer, Thirty Meter Telescope (2006 - 2006)
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Laboratory Directed Research and Development selection committee Member, Lawrence Livermore National Laboratory (2005 - 2007)
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Chair, Next-Generation Wavefront Controller CDR, Keck Observatory (2005 - 2005)
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Member Terrestrial Planet Finder instrument conceptual design selection, NASA (2005 - 2005)
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Terrestrial Planet Finder Technology Advisory Committee Member, Jet Propulsion Laboratory (2004 - 2006)
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AO Development Plan Steering Committee Member, National Science Foundation (2004 - 2004)
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Member NSF Major Research Instrumentation Astronomy Review Panel, National Science Foundation (2003 - 2003)
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Member, Keck Observatory Adaptive Optics Working Group (2002 - 2008)
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Member, NASA Gossamer Spacecraft Program Review Panel (2001 - 2001)
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Member LLNL IGPP Director Search Committee, Lawrence Livermore National Laboratory (2001 - 2001)
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Member, University of California Observatories Infrared Working Group (1995 - 2002)
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Member, American Astronomical Society
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Referee, Optics Express
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Referee, Applied Optics
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Referee, Ap. J. Letters
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Referee, PASP
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Referee, Ap.J
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Referee, JOSA A
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Member, AAS Division of Planetary Sciences
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Referee, A&A
Professional Education
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B.Sc., Trinity College, University of Toronto, Ontario, Canada, Physics (1988)
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Ph.D., University of California, Los Angeles, Astronomy (1994)
2023-24 Courses
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Independent Studies (3)
- Independent Research and Study
PHYSICS 190 (Win, Spr) - Research
PHYSICS 490 (Aut, Win, Spr) - Senior Thesis Research
PHYSICS 205 (Aut, Win, Spr)
- Independent Research and Study
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Prior Year Courses
2021-22 Courses
- Electricity, Magnetism, and Optics
PHYSICS 23 (Win)
2020-21 Courses
- Introduction to Stellar and Galactic Astrophysics
PHYSICS 160, PHYSICS 260 (Win) - Stars and Planets in a Habitable Universe
PHYSICS 15 (Spr)
- Electricity, Magnetism, and Optics
All Publications
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Atmospheric Monitoring and Precise Spectroscopy of the HR 8799 Planets with SCExAO/CHARIS*
ASTRONOMICAL JOURNAL
2022; 164 (4)
View details for DOI 10.3847/1538-3881/ac8984
View details for Web of Science ID 000854330100001
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Astrometric gravitational-wave detection via stellar interferometry
PHYSICAL REVIEW D
2022; 106 (2)
View details for DOI 10.1103/PhysRevD.106.023002
View details for Web of Science ID 000827455500006
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Integral Field Spectroscopy with the Solar Gravitational Lens
ASTROPHYSICAL JOURNAL
2022; 930 (1)
View details for DOI 10.3847/1538-4357/ac5e9d
View details for Web of Science ID 000789660600001
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Multiwavelength Mitigation of Stellar Activity in Astrometric Planet Detection
ASTRONOMICAL JOURNAL
2022; 163 (5)
View details for DOI 10.3847/1538-3881/ac56e0
View details for Web of Science ID 000781801100001
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Deep Exploration of the Planets HR 8799 b, c, and d with Moderate-resolution Spectroscopy
ASTRONOMICAL JOURNAL
2021; 162 (6)
View details for DOI 10.3847/1538-3881/ac273a
View details for Web of Science ID 000727016600001
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Starshade rendezvous: exoplanet sensitivity and observing strategy
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
2021; 7 (2)
View details for DOI 10.1117/1.JATIS.7.2.021210
View details for Web of Science ID 000674834700013
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Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc
ASTRONOMICAL JOURNAL
2021; 161 (3)
View details for DOI 10.3847/1538-3881/abd639
View details for Web of Science ID 000620947300001
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The Nancy Grace Roman Space Telescope Coronagraph Instrument (CGI) Technology Demonstration
SPIE-INT SOC OPTICAL ENGINEERING. 2021
View details for DOI 10.1117/12.2562997
View details for Web of Science ID 000646193100025
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A Search for Polarized Thermal Emission from Directly Imaged Exoplanets and Brown Dwarf Companions to Nearby Stars
ASTRONOMICAL JOURNAL
2020; 160 (6)
View details for DOI 10.3847/1538-3881/abc33d
View details for Web of Science ID 000593511700001
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Moderate-resolution K-band Spectroscopy of Substellar Companion kappa Andromedae b
ASTRONOMICAL JOURNAL
2020; 160 (5)
View details for DOI 10.3847/1538-3881/abb9b1
View details for Web of Science ID 000577768600001
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On the Chemical Abundance of HR 8799 and the Planet c
ASTRONOMICAL JOURNAL
2020; 160 (3)
View details for DOI 10.3847/1538-3881/ababa7
View details for Web of Science ID 000568414800001
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Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager
ASTRONOMICAL JOURNAL
2020; 160 (2)
View details for DOI 10.3847/1538-3881/ab91b1
View details for Web of Science ID 000582598300007
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Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign
ASTRONOMICAL JOURNAL
2020; 160 (1)
View details for DOI 10.3847/1538-3881/ab9199
View details for Web of Science ID 000542590400001
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BAFFLES: Bayesian Ages for Field Lower-mass Stars
ASTROPHYSICAL JOURNAL
2020; 898 (1)
View details for DOI 10.3847/1538-4357/ab9a35
View details for Web of Science ID 000553460400001
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The Gemini Planet Imager View of the HD 32297 Debris Disk
ASTRONOMICAL JOURNAL
2020; 159 (6)
View details for DOI 10.3847/1538-3881/ab8881
View details for Web of Science ID 000533607100001
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HD 165054: An Astrometric Calibration Field for High-contrast Imagers in Baade's Window
ASTRONOMICAL JOURNAL
2020; 159 (6)
View details for DOI 10.3847/1538-3881/ab86aa
View details for Web of Science ID 000531607100001
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Imaging the 44 au Kuiper Belt Analog Debris Ring around HD 141569A with GPI Polarimetry
ASTRONOMICAL JOURNAL
2020; 159 (2)
View details for DOI 10.3847/1538-3881/ab5d2e
View details for Web of Science ID 000520440300001
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The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet beta Pictoris b from Combined Direct Imaging and Astrometry
ASTRONOMICAL JOURNAL
2020; 159 (2)
View details for DOI 10.3847/1538-3881/ab5b92
View details for Web of Science ID 000520508500001
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Revised astrometric calibration of the Gemini Planet Imager
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
2020; 6 (1)
View details for DOI 10.1117/1.JATIS.6.1.015006
View details for Web of Science ID 000590130800019
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First Resolved Scattered-light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager
ASTRONOMICAL JOURNAL
2020; 159 (1)
View details for DOI 10.3847/1538-3881/ab5af2
View details for Web of Science ID 000519136300001
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An Updated Visual Orbit of the Directly Imaged Exoplanet 51 Eridani b and Prospects for a Dynamical Mass Measurement with Gaia
ASTRONOMICAL JOURNAL
2020; 159 (1)
View details for DOI 10.3847/1538-3881/ab4da4
View details for Web of Science ID 000555473100001
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Effects of mirror seeing on high-contrast adaptive optics instruments
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
2020; 6 (1)
View details for DOI 10.1117/1.JATIS.6.1.015002
View details for Web of Science ID 000590130800015
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The Possible Astrometric Signature of a Planetary-mass Companion to the Nearby Young Star TW Piscis Austrini (Fomalhaut B): Constraints from Astrometry, Radial Velocities, and Direct Imaging
ASTRONOMICAL JOURNAL
2019; 158 (6)
View details for DOI 10.3847/1538-3881/ab4c9b
View details for Web of Science ID 000499917500001
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Detection of a Low-mass Stellar Companion to the Accelerating A2IV Star HR 1645
ASTRONOMICAL JOURNAL
2019; 158 (6)
View details for DOI 10.3847/1538-3881/ab4ef7
View details for Web of Science ID 000499917800001
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Radial Velocity Discovery of an Eccentric Jovian World Orbiting at 18 au
ASTRONOMICAL JOURNAL
2019; 158 (5)
View details for DOI 10.3847/1538-3881/ab3e63
View details for Web of Science ID 000503507000012
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Radial Velocity Measurements of HR 8799 b and c with Medium Resolution Spectroscopy
ASTRONOMICAL JOURNAL
2019; 158 (5)
View details for DOI 10.3847/1538-3881/ab4594
View details for Web of Science ID 000498577800003
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Model of the Search for Extraterrestrial Intelligence with Coronagraphic Imaging
ASTRONOMICAL JOURNAL
2019; 158 (5)
View details for DOI 10.3847/1538-3881/ab40b8
View details for Web of Science ID 000498575100002
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Asymmetries in adaptive optics point spread functions
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
2019; 5 (4)
View details for DOI 10.1117/1.JATIS.5.4.049003
View details for Web of Science ID 000510649500028
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The Degree of Alignment between Circumbinary Disks and Their Binary Hosts
ASTROPHYSICAL JOURNAL
2019; 883 (1)
View details for DOI 10.3847/1538-4357/ab287b
View details for Web of Science ID 000486374000022
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Formation Design of Distributed Telescopes in Earth Orbit for Astrophysics Applications
JOURNAL OF SPACECRAFT AND ROCKETS
2019; 56 (5): 1462–77
View details for DOI 10.2514/1.A34420
View details for Web of Science ID 000489334400016
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Detecting Planets from Direct-imaging Observations Using Common Spatial Pattern Filtering
ASTRONOMICAL JOURNAL
2019; 158 (3)
View details for DOI 10.3847/1538-3881/ab3642
View details for Web of Science ID 000482608400005
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An Exo-Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light
ASTROPHYSICAL JOURNAL
2019; 882 (1)
View details for DOI 10.3847/1538-4357/ab3403
View details for Web of Science ID 000484506100006
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TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45Myr Tucana-Horologium Association
ASTROPHYSICAL JOURNAL LETTERS
2019; 880 (1)
View details for DOI 10.3847/2041-8213/ab2988
View details for Web of Science ID 000476911200002
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The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au
ASTRONOMICAL JOURNAL
2019; 158 (1)
View details for DOI 10.3847/1538-3881/ab16e9
View details for Web of Science ID 000471328800006
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Performance of the Gemini Planet Imager Non-redundant Mask and Spectroscopy of Two Close-separation Binaries: HR 2690 and HD 142527
ASTRONOMICAL JOURNAL
2019; 157 (6)
View details for DOI 10.3847/1538-3881/ab17db
View details for Web of Science ID 000470708400004
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Simulating the Effects of Exozodiacal Dust in WFIRST CGI observations
SPIE-INT SOC OPTICAL ENGINEERING. 2019
View details for DOI 10.1117/12.2529488
View details for Web of Science ID 000511170200014
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Dynamical Constraints on the HR 8799 Planets with GPI
ASTRONOMICAL JOURNAL
2018; 156 (5)
View details for DOI 10.3847/1538-3881/aae150
View details for Web of Science ID 000447164500002
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A Bayesian Framework for Exoplanet Direct Detection and Non-detection
ASTRONOMICAL JOURNAL
2018; 156 (5)
View details for DOI 10.3847/1538-3881/aade95
View details for Web of Science ID 000447164500006
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Color Classification of Extrasolar Giant Planets: Prospects and Cautions
ASTRONOMICAL JOURNAL
2018; 156 (4)
View details for DOI 10.3847/1538-3881/aad59d
View details for Web of Science ID 000444698500004
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Direct Imaging of the HD 35841 Debris Disk: A Polarized Dust Ring from Gemini Planet Imager and an Outer Halo from HST/STIS
ASTRONOMICAL JOURNAL
2018; 156 (2)
View details for DOI 10.3847/1538-3881/aacbc9
View details for Web of Science ID 000438669300001
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GPI Spectra of HR 8799 c, d, and e from 1.5 to 2.4 mu m with KLIP Forward Modeling
ASTRONOMICAL JOURNAL
2018; 155 (6)
View details for DOI 10.3847/1538-3881/aabcb8
View details for Web of Science ID 000431526900002
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Characterizing Earth Analogs in Reflected Light: Atmospheric Retrieval Studies for Future Space Telescopes
ASTRONOMICAL JOURNAL
2018; 155 (5)
View details for DOI 10.3847/1538-3881/aab95c
View details for Web of Science ID 000430532600001
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WFIRST Coronagraph Technology Requirements: Status Update and Systems Engineering Approach
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for Web of Science ID 000442117200054
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Moving the Gemini planet imager to Gemini North: expectations and challenges
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2312778
View details for Web of Science ID 000452664300097
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Air, Telescope, and Instrument Temperature Effects on the Gemini Planet Imager's Image Quality
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2319615
View details for Web of Science ID 000452819300155
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Upgrading the Gemini Planet Imager: GPI 2.0
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2313771
View details for Web of Science ID 000452664300100
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Application of phase diversity to estimate the non common path aberrations in the Gemini Planet Imager: results from simulation and real data
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2313458
View details for Web of Science ID 000452819300168
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Characterization of lemniscate atmospheric aberrations in Gemini Planet Imager data
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2314267
View details for Web of Science ID 000452819300189
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The Gemini Planet Imager: Looking back over five years and forward to the future
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2314253
View details for Web of Science ID 000452819300017
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Automated data processing architecture for the Gemini Planet Imager Exoplanet Survey
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
2018; 4 (1)
View details for DOI 10.1117/1.JATIS.4.1.018002
View details for Web of Science ID 000429569000037
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Lessons for WFIRST CGI from ground-based high-contrast systems
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2313820
View details for Web of Science ID 000450864600169
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Characterization of atmospheric turbulence for the Large Synoptic Survey Telescope
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2314311
View details for Web of Science ID 000450858000141
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Two-Stage Attitude Control for Direct Imaging of Exoplanets with a CubeSat Telescope
SPIE-INT SOC OPTICAL ENGINEERING. 2018
View details for DOI 10.1117/12.2314233
View details for Web of Science ID 000450864600054
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Individual, Model-independent Masses of the Closest Known Brown Dwarf Binary to the Sun
ASTROPHYSICAL JOURNAL
2017; 846 (2)
View details for DOI 10.3847/1538-4357/aa844f
View details for Web of Science ID 000425459000009
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Optimization of pyKLIP's forward model matched filter for the GPI Exoplanet Survey
SPIE-INT SOC OPTICAL ENGINEERING. 2017
View details for DOI 10.1117/12.2274539
View details for Web of Science ID 000423870900061
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Planet signal extraction from direct imaging using common spatial pattern filtering
SPIE-INT SOC OPTICAL ENGINEERING. 2017
View details for DOI 10.1117/12.2273957
View details for Web of Science ID 000423870900046
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The automated data processing architecture for the GPI Exoplanet Survey
SPIE-INT SOC OPTICAL ENGINEERING. 2017
View details for DOI 10.1117/12.2274531
View details for Web of Science ID 000423870900060
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High Contrast Observations of Circumstellar Disks with the Gemini Planet Imager's Polarimetry Mode
SPIE-INT SOC OPTICAL ENGINEERING. 2017
View details for DOI 10.1117/12.2275823
View details for Web of Science ID 000418369900024
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BRINGING "THE MOTH" TO LIGHT: A PLANET-SCULPTING SCENARIO FOR THE HD 61005 DEBRIS DISK
ASTRONOMICAL JOURNAL
2016; 152 (4)
View details for DOI 10.3847/0004-6256/152/4/85
View details for Web of Science ID 000383805000007
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The International Deep Planet Survey II. The frequency of directly imaged giant exoplanets with stellar mass
ASTRONOMY & ASTROPHYSICS
2016; 594
View details for DOI 10.1051/0004-6361/201527828
View details for Web of Science ID 000385832200039
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DISCOVERY OF A SUBSTELLAR COMPANION TO THE NEARBY DEBRIS DISK HOST HR 2562
ASTROPHYSICAL JOURNAL LETTERS
2016; 829 (1)
View details for DOI 10.3847/2041-8205/829/1/L4
View details for Web of Science ID 000385412000004
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ASTROMETRIC MONITORING OF THE HR 8799 PLANETS: ORBIT CONSTRAINTS FROM SELF-CONSISTENT MEASUREMENTS
ASTRONOMICAL JOURNAL
2016; 152 (2)
View details for DOI 10.3847/0004-6256/152/2/28
View details for Web of Science ID 000381817500001
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THE PDS 66 CIRCUMSTELLAR DISK AS SEEN IN POLARIZED LIGHT WITH THE GEMINI PLANET IMAGER
ASTROPHYSICAL JOURNAL LETTERS
2016; 818 (1)
View details for DOI 10.3847/2041-8205/818/1/L15
View details for Web of Science ID 000369605600015
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Performance of the Gemini Planet Imager's adaptive optics system
APPLIED OPTICS
2016; 55 (2): 323-340
Abstract
The Gemini Planet Imager's adaptive optics (AO) subsystem was designed specifically to facilitate high-contrast imaging. A definitive description of the system's algorithms and technologies as built is given. 564 AO telemetry measurements from the Gemini Planet Imager Exoplanet Survey campaign are analyzed. The modal gain optimizer tracks changes in atmospheric conditions. Science observations show that image quality can be improved with the use of both the spatially filtered wavefront sensor and linear-quadratic-Gaussian control of vibration. The error budget indicates that for all targets and atmospheric conditions AO bandwidth error is the largest term.
View details for DOI 10.1364/AO.55.000323
View details for Web of Science ID 000368006800016
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Science yield estimate with the Wide-Field Infrared Survey Telescope coronagraph
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
2016; 2 (1)
View details for DOI 10.1117/1.JATIS.2.1.011020
View details for Web of Science ID 000374192200021
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Accreting protoplanets in the LkCa 15 transition disk.
Nature
2015; 527 (7578): 342-344
Abstract
Exoplanet detections have revolutionized astronomy, offering new insights into solar system architecture and planet demographics. While nearly 1,900 exoplanets have now been discovered and confirmed, none are still in the process of formation. Transition disks, protoplanetary disks with inner clearings best explained by the influence of accreting planets, are natural laboratories for the study of planet formation. Some transition disks show evidence for the presence of young planets in the form of disk asymmetries or infrared sources detected within their clearings, as in the case of LkCa 15 (refs 8, 9). Attempts to observe directly signatures of accretion onto protoplanets have hitherto proven unsuccessful. Here we report adaptive optics observations of LkCa 15 that probe within the disk clearing. With accurate source positions over multiple epochs spanning 2009-2015, we infer the presence of multiple companions on Keplerian orbits. We directly detect Hα emission from the innermost companion, LkCa 15 b, evincing hot (about 10,000 kelvin) gas falling deep into the potential well of an accreting protoplanet.
View details for DOI 10.1038/nature15761
View details for PubMedID 26581290
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Discovery and spectroscopy of the young jovian planet 51 Eri b with the Gemini Planet Imager.
Science
2015; 350 (6256): 64-67
Abstract
Directly detecting thermal emission from young extrasolar planets allows measurement of their atmospheric compositions and luminosities, which are influenced by their formation mechanisms. Using the Gemini Planet Imager, we discovered a planet orbiting the ~20-million-year-old star 51 Eridani at a projected separation of 13 astronomical units. Near-infrared observations show a spectrum with strong methane and water-vapor absorption. Modeling of the spectra and photometry yields a luminosity (normalized by the luminosity of the Sun) of 1.6 to 4.0 × 10(-6) and an effective temperature of 600 to 750 kelvin. For this age and luminosity, "hot-start" formation models indicate a mass twice that of Jupiter. This planet also has a sufficiently low luminosity to be consistent with the "cold-start" core-accretion process that may have formed Jupiter.
View details for DOI 10.1126/science.aac5891
View details for PubMedID 26272904
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beta PICTORIS' INNER DISK IN POLARIZED LIGHT AND NEW ORBITAL PARAMETERS FOR beta PICTORIS b
ASTROPHYSICAL JOURNAL
2015; 811 (1)
View details for DOI 10.1088/0004-637X/811/1/18
View details for Web of Science ID 000363471600019
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CHARACTERIZING THE ATMOSPHERES OF THE HR8799 PLANETS WITH HST/WFC3
ASTROPHYSICAL JOURNAL LETTERS
2015; 809 (2)
View details for DOI 10.1088/2041-8205/809/2/L33
View details for Web of Science ID 000360715500016
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SIMULTANEOUS DETECTION OF WATER, METHANE, AND CARBON MONOXIDE IN THE ATMOSPHERE OF EXOPLANET HR 8799 b
ASTROPHYSICAL JOURNAL
2015; 804 (1)
View details for DOI 10.1088/0004-637X/804/1/61
View details for Web of Science ID 000354189500061
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SCATTERED LIGHT FROM DUST IN THE CAVITY OF THE V4046 Sgr TRANSITION DISK
ASTROPHYSICAL JOURNAL LETTERS
2015; 803 (1)
View details for DOI 10.1088/2041-8205/803/1/L10
View details for Web of Science ID 000352817200010
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POLARIMETRY WITH THE GEMINI PLANET IMAGER: METHODS, PERFORMANCE AT FIRST LIGHT, AND THE CIRCUMSTELLAR RING AROUND HR 4796A
ASTROPHYSICAL JOURNAL
2015; 799 (2)
View details for DOI 10.1088/0004-637X/799/2/182
View details for Web of Science ID 000348820900069
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THE FIRST H-BAND SPECTRUM OF THE GIANT PLANET beta PICTORIS b
ASTROPHYSICAL JOURNAL LETTERS
2015; 798 (1)
View details for DOI 10.1088/2041-8205/798/1/L3
View details for Web of Science ID 000347462300003
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The VAST Survey - IV. A wide brown dwarf companion to the A3V star zeta Delphini
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2014; 445 (4): 3694-3705
View details for DOI 10.1093/mnras/stu2018
View details for Web of Science ID 000346963300029
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GEMINI PLANET IMAGER SPECTROSCOPY OF THE HR 8799 PLANETS c AND d
ASTROPHYSICAL JOURNAL LETTERS
2014; 794 (1)
View details for DOI 10.1088/2041-8205/794/1/L15
View details for Web of Science ID 000343304300015
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First light of the Gemini Planet Imager
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
2014; 111 (35): 12661-12666
Abstract
The Gemini Planet Imager is a dedicated facility for directly imaging and spectroscopically characterizing extrasolar planets. It combines a very high-order adaptive optics system, a diffraction-suppressing coronagraph, and an integral field spectrograph with low spectral resolution but high spatial resolution. Every aspect of the Gemini Planet Imager has been tuned for maximum sensitivity to faint planets near bright stars. During first-light observations, we achieved an estimated H band Strehl ratio of 0.89 and a 5-σ contrast of 10(6) at 0.75 arcseconds and 10(5) at 0.35 arcseconds. Observations of Beta Pictoris clearly detect the planet, Beta Pictoris b, in a single 60-s exposure with minimal postprocessing. Beta Pictoris b is observed at a separation of 434 ± 6 milliarcseconds (mas) and position angle 211.8 ± 0.5°. Fitting the Keplerian orbit of Beta Pic b using the new position together with previous astrometry gives a factor of 3 improvement in most parameters over previous solutions. The planet orbits at a semimajor axis of [Formula: see text] near the 3:2 resonance with the previously known 6-AU asteroidal belt and is aligned with the inner warped disk. The observations give a 4% probability of a transit of the planet in late 2017.
View details for DOI 10.1073/pnas.1304215111
View details for Web of Science ID 000341230800041
View details for PubMedCentralID PMC4156769
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First light of the Gemini Planet imager.
Proceedings of the National Academy of Sciences of the United States of America
2014; 111 (35): 12661-12666
Abstract
The Gemini Planet Imager is a dedicated facility for directly imaging and spectroscopically characterizing extrasolar planets. It combines a very high-order adaptive optics system, a diffraction-suppressing coronagraph, and an integral field spectrograph with low spectral resolution but high spatial resolution. Every aspect of the Gemini Planet Imager has been tuned for maximum sensitivity to faint planets near bright stars. During first-light observations, we achieved an estimated H band Strehl ratio of 0.89 and a 5-σ contrast of 10(6) at 0.75 arcseconds and 10(5) at 0.35 arcseconds. Observations of Beta Pictoris clearly detect the planet, Beta Pictoris b, in a single 60-s exposure with minimal postprocessing. Beta Pictoris b is observed at a separation of 434 ± 6 milliarcseconds (mas) and position angle 211.8 ± 0.5°. Fitting the Keplerian orbit of Beta Pic b using the new position together with previous astrometry gives a factor of 3 improvement in most parameters over previous solutions. The planet orbits at a semimajor axis of [Formula: see text] near the 3:2 resonance with the previously known 6-AU asteroidal belt and is aligned with the inner warped disk. The observations give a 4% probability of a transit of the planet in late 2017.
View details for DOI 10.1073/pnas.1304215111
View details for PubMedID 24821792
View details for PubMedCentralID PMC4156769
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RESOLVED IMAGING OF THE HR 8799 DEBRIS DISK WITH HERSCHEL
ASTROPHYSICAL JOURNAL
2014; 780 (1)
View details for DOI 10.1088/0004-637X/780/1/97
View details for Web of Science ID 000328937100097
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MEMS and the direct detection of exoplanets
Conference on MEMS Adaptive Optics VIII
SPIE-INT SOC OPTICAL ENGINEERING. 2014
View details for DOI 10.1117/12.2044134
View details for Web of Science ID 000336081700005
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Gemini planet imager integration to the Gemini South telescope software environment
Conference on Observatory Operations - Strategies, Processes, and Systems V
SPIE-INT SOC OPTICAL ENGINEERING. 2014
View details for DOI 10.1117/12.2055654
View details for Web of Science ID 000343092000076
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The VAST Survey - III. The multiplicity of A-type stars within 75 pc
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2014; 437 (2): 1216-1240
View details for DOI 10.1093/mnras/stt1932
View details for Web of Science ID 000331617000016
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The adaptive x-ray optic project at the Lawrence Livermore National Laboratory
17th Pan-American Synchrotron Radiation Instrumentation Conference (SRI)
IOP PUBLISHING LTD. 2014
View details for DOI 10.1088/1742-6596/493/1/012022
View details for Web of Science ID 000336000800022
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FOMALHAUT b: INDEPENDENT ANALYSIS OF THE HUBBLE SPACE TELESCOPE PUBLIC ARCHIVE DATA
ASTROPHYSICAL JOURNAL
2013; 769 (1)
View details for DOI 10.1088/0004-637X/769/1/42
View details for Web of Science ID 000319904500042
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Computer vision applications for coronagraphic optical alignment and image processing
APPLIED OPTICS
2013; 52 (14): 3394-3403
View details for DOI 10.1364/AO.52.003394
View details for Web of Science ID 000318994500034
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Detection of Carbon Monoxide and Water Absorption Lines in an Exoplanet Atmosphere
SCIENCE
2013; 339 (6126): 1398-1401
View details for DOI 10.1126/science.1232003
View details for Web of Science ID 000316740700033
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High-contrast imager for Complex Aperture Telescopes (HiCAT): 1. Testbed design
Conference on Techniques and Instrumentation for Detection of Exoplanets VI
SPIE-INT SOC OPTICAL ENGINEERING. 2013
View details for DOI 10.1117/12.2023718
View details for Web of Science ID 000326739300050
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The International Deep Planet Survey I. The frequency of wide-orbit massive planets around A-stars
ASTRONOMY & ASTROPHYSICS
2012; 544
View details for DOI 10.1051/0004-6361/201218991
View details for Web of Science ID 000308290100009
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The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2012; 422 (4): 2765-2785
View details for DOI 10.1111/j.1365-2966.2011.20397.x
View details for Web of Science ID 000304246100003
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ROTATIONAL VELOCITIES OF INDIVIDUAL COMPONENTS IN VERY LOW MASS BINARIES
ASTROPHYSICAL JOURNAL
2012; 750 (1)
View details for DOI 10.1088/0004-637X/750/1/79
View details for Web of Science ID 000303063500079
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A SUBSTELLAR COMPANION TO THE DUSTY PLEIADES STAR HD 23514
ASTROPHYSICAL JOURNAL
2012; 748 (1)
View details for DOI 10.1088/0004-637X/748/1/30
View details for Web of Science ID 000301347500030
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MEMS practice, from the lab to the telescope
Conference on MEMS Adaptive Optics VI
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.910964
View details for Web of Science ID 000302692300002
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Coronagraphic Imaging of Debris Disks From a High Altitude Balloon Platform
Conference on Space Telescopes and Instrumentation - Optical, Infrared, and Millimeter Wave
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.924175
View details for Web of Science ID 000310691600015
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Performance of the Integral Field Spectrograph for the Gemini Planet Imager
Conference on Ground-Based and Airborne Telescopes IV
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.925790
View details for Web of Science ID 000313675900271
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Conceptual design for a deformable mirror for use with X-ray sources
Conference on Adaptive Optics Systems III
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.927233
View details for Web of Science ID 000312387300195
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Polarimetric Performance of the Gemini Planet Imager
Conference on Ground-Based and Airborne Telescopes IV
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.925239
View details for Web of Science ID 000313675900275
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The Gemini Planet Imager: Integration and Test
Conference on Ground-Based and Airborne Telescopes IV
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.926721
View details for Web of Science ID 000313675900057
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Wavefront sensing and correction with the Gemini Planet Imager
Conference on Adaptive Optics Systems III
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.926680
View details for Web of Science ID 000312387300036
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Technology demonstration of starshade manufacturing for NASA's Exoplanet Mission Program
Conference on Space Telescopes and Instrumentation - Optical, Infrared, and Millimeter Wave
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.926790
View details for Web of Science ID 000310691600009
- The Gemini Planet Imager: integration and status 2012: 84461U
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Test results for the Gemini Planet Imager data reduction pipeline
Conference On Software and Cyberinfrastructure for Astronomy II
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.926202
View details for Web of Science ID 000312888700109
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Focal plane wavefront sensing and control for ground-based imaging
Conference on Adaptive Optics Systems III
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.926353
View details for Web of Science ID 000312387300213
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Theoretical Limits on Bright Star Astrometry with Multi-Conjugate Adaptive Optics using a Diffractive Pupil
Conference on Adaptive Optics Systems III
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.927281
View details for Web of Science ID 000312387300022
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Review of small-angle coronagraphic techniques in the wake of ground-based second-generation adaptive optics systems
Conference on Space Telescopes and Instrumentation - Optical, Infrared, and Millimeter Wave
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.927245
View details for Web of Science ID 000310691600003
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Aliasing in a Hartmann wavefront sensor at x-ray wavelengths
Conference on Adaptive X-Ray Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.946116
View details for Web of Science ID 000312165200016
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High-contrast imaging in the Hyades with snapshot LOCI
Conference on Adaptive Optics Systems III
SPIE-INT SOC OPTICAL ENGINEERING. 2012
View details for DOI 10.1117/12.926377
View details for Web of Science ID 000312387300021
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M-BAND IMAGING OF THE HR 8799 PLANETARY SYSTEM USING AN INNOVATIVE LOCI-BASED BACKGROUND SUBTRACTION TECHNIQUE
ASTROPHYSICAL JOURNAL LETTERS
2011; 739 (2)
View details for DOI 10.1088/2041-8205/739/2/L41
View details for Web of Science ID 000294997600007
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TESTING THE APODIZED PUPIL LYOT CORONAGRAPH ON THE LABORATORY FOR ADAPTIVE OPTICS EXTREME ADAPTIVE OPTICS TESTBED
ASTRONOMICAL JOURNAL
2011; 142 (4)
View details for DOI 10.1088/0004-6256/142/4/119
View details for Web of Science ID 000295042500023
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THE YOUNG PLANET-MASS OBJECT 2M1207b: A COOL, CLOUDY, AND METHANE-POOR ATMOSPHERE
ASTROPHYSICAL JOURNAL LETTERS
2011; 735 (2)
View details for DOI 10.1088/2041-8205/735/2/L39
View details for Web of Science ID 000293138000015
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The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2011; 415 (1): 854-866
View details for DOI 10.1111/j.1365-2966.2011.18765.x
View details for Web of Science ID 000293755000088
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Experimental Design for the Gemini Planet Imager
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
2011; 123 (904): 692-708
View details for Web of Science ID 000292421300005
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CLOUDS AND CHEMISTRY IN THE ATMOSPHERE OF EXTRASOLAR PLANET HR8799b
ASTROPHYSICAL JOURNAL
2011; 733 (1)
View details for DOI 10.1088/0004-637X/733/1/65
View details for Web of Science ID 000290314600065
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APODIZED PUPIL LYOT CORONAGRAPHS FOR ARBITRARY APERTURES. III. QUASI-ACHROMATIC SOLUTIONS
ASTROPHYSICAL JOURNAL
2011; 729 (2)
View details for DOI 10.1088/0004-637X/729/2/144
View details for Web of Science ID 000288608700067
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DETERMINATION OF THE INCLINATION OF THE MULTI-PLANET HOSTING STAR HR 8799 USING ASTEROSEISMOLOGY
ASTROPHYSICAL JOURNAL LETTERS
2011; 728 (1)
View details for DOI 10.1088/2041-8205/728/1/L20
View details for Web of Science ID 000286623000020
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The use of a high-order MEMS deformable mirror in the Gemini Planet Imager
Conference on MEMS Adaptive Optics V
SPIE-INT SOC OPTICAL ENGINEERING. 2011
View details for DOI 10.1117/12.876496
View details for Web of Science ID 000298045000003
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Zodiac II: Debris Disk Science from a Balloon
Conference on Techniques and Instrumentation for Detection of Exoplanets V
SPIE-INT SOC OPTICAL ENGINEERING. 2011
View details for DOI 10.1117/12.899688
View details for Web of Science ID 000296102700048
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Rotational Velocities of Very Low Mass Binaries
16th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
ASTRONOMICAL SOC PACIFIC. 2011: 147–154
View details for Web of Science ID 000304381600016
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Integration and test of the Gemini Planet Imager
Conference on Astronomical Adaptive Optics Systems and Applications IV
SPIE-INT SOC OPTICAL ENGINEERING. 2011
View details for DOI 10.1117/12.893728
View details for Web of Science ID 000296103600003
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Advancing Technology for Starlight Suppression via an External Occulter
Conference on Techniques and Instrumentation for Detection of Exoplanets V
SPIE-INT SOC OPTICAL ENGINEERING. 2011
View details for DOI 10.1117/12.894497
View details for Web of Science ID 000296102700019
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Images of a fourth planet orbiting HR 8799
NATURE
2010; 468 (7327): 1080-1083
Abstract
High-contrast near-infrared imaging of the nearby star HR 8799 has shown three giant planets. Such images were possible because of the wide orbits (>25 astronomical units, where 1 au is the Earth-Sun distance) and youth (<100 Myr) of the imaged planets, which are still hot and bright as they radiate away gravitational energy acquired during their formation. An important area of contention in the exoplanet community is whether outer planets (>10 au) more massive than Jupiter form by way of one-step gravitational instabilities or, rather, through a two-step process involving accretion of a core followed by accumulation of a massive outer envelope composed primarily of hydrogen and helium. Here we report the presence of a fourth planet, interior to and of about the same mass as the other three. The system, with this additional planet, represents a challenge for current planet formation models as none of them can explain the in situ formation of all four planets. With its four young giant planets and known cold/warm debris belts, the HR 8799 planetary system is a unique laboratory in which to study the formation and evolution of giant planets at wide (>10 au) separations.
View details for DOI 10.1038/nature09684
View details for Web of Science ID 000285553800053
View details for PubMedID 21150902
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MASSES AND ORBITAL CONSTRAINTS FOR THE OGLE-2006-BLG-109Lb,c JUPITER/SATURN ANALOG PLANETARY SYSTEM
ASTROPHYSICAL JOURNAL
2010; 713 (2): 837-855
View details for DOI 10.1088/0004-637X/713/2/837
View details for Web of Science ID 000276329400010
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A COLD NEPTUNE-MASS PLANET OGLE-2007-BLG-368Lb: COLD NEPTUNES ARE COMMON
ASTROPHYSICAL JOURNAL
2010; 710 (2): 1641-1653
View details for DOI 10.1088/0004-637X/710/2/1641
View details for Web of Science ID 000274233300057
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Imaging Polarimetry with the Gemini Planet Imager
Conference on Adaptive Optics Systems II
SPIE-INT SOC OPTICAL ENGINEERING. 2010
View details for DOI 10.1117/12.857741
View details for Web of Science ID 000285506400192
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Performance of MEMS-based visible-light adaptive optics at Lick Observatory: Closed- and open-loop control
Conference on Adaptive Optics Systems II
SPIE-INT SOC OPTICAL ENGINEERING. 2010
View details for DOI 10.1117/12.857444
View details for Web of Science ID 000285506400056
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Laboratory test of application of Electric Field Conjugation image-sharpening to ground-based adaptive optics
Conference on Adaptive Optics Systems II
SPIE-INT SOC OPTICAL ENGINEERING. 2010
View details for DOI 10.1117/12.857511
View details for Web of Science ID 000285506400187
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The infrared imaging spectrograph (IRIS) for TMT: spectrograph design
Conference on Ground-based and Airborne Instrumentation for Astronomy III
SPIE-INT SOC OPTICAL ENGINEERING. 2010
View details for DOI 10.1117/12.857404
View details for Web of Science ID 000285832400085
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Gemini Planet Imager coronagraph testbed results
Conference on Ground-based and Airborne Instrumentation for Astronomy III
SPIE-INT SOC OPTICAL ENGINEERING. 2010
View details for DOI 10.1117/12.858623
View details for Web of Science ID 000285832400159
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Exoplanet Imaging with LOCI Processing: Photometry and Astrometry with the New SOSIE Pipeline.
Conference on Adaptive Optics Systems II
SPIE-INT SOC OPTICAL ENGINEERING. 2010
View details for DOI 10.1117/12.857225
View details for Web of Science ID 000285506400052
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Data reduction pipeline for the Gemini Planet Imager
Conference on Ground-based and Airborne Instrumentation for Astronomy III
SPIE-INT SOC OPTICAL ENGINEERING. 2010
View details for DOI 10.1117/12.858028
View details for Web of Science ID 000285832400104
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Advanced static speckle calibration for exo-planet imaging
Conference on Adaptive Optics Systems II
SPIE-INT SOC OPTICAL ENGINEERING. 2010
View details for DOI 10.1117/12.858270
View details for Web of Science ID 000285506400077
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Amplitude variations on a MEMS-based extreme adaptive optics coronagraph testbed
APPLIED OPTICS
2009; 48 (21): 4077-4089
Abstract
High-contrast imaging techniques such as coronagraphy are expected to play an important role in the imaging of extrasolar planets. Instruments like the Gemini Planet Imager (GPI) or the Spectro-Polar-Imetric High-Contrast Exoplanet Research (SPHERE) require high-dynamic range, achieved using coronagraphs to block light coming from the parent star. An extremely good adaptive optics (AO) system is required to reduce dynamic atmospheric wavefront errors to 50-100 nm rms. Systematic wavefront errors must also be controlled at the nanometer-equivalent level to remove persistent speckle artifacts. While precision AO systems can control wavefront phase errors at this level, systematic amplitude or intensity errors can also produce speckle artifacts and are uncontrolled by traditional AO phase conjugation. On the Laboratory for Adaptive Optics (LAO) extreme AO testbed, we observed a discrepancy between the coronagraphic image profile and the profile predicted by simple simulations using the measured optical phase, which could potentially be explained by amplitude variations. Measurements showed up to 7% rms intensity changes across the microelectrical mechanical (MEM) plane of the system. We identified potential sources of amplitude variation and compared them to a Fresnel model of the system. One potential concern was the surface structure of the MEM system's (MEMS) deformable mirror, but analysis shows that it induces at most 2% rms variation. The bulk of the observed intensity variation is due to nonuniform illumination of the system by the input single-mode fiber and phase errors mixing into amplitude at the nonpupil-plane due to the Talbot effect, coupled with residual astigmatism in the pupil imager.
View details for DOI 10.1364/AO.48.004077
View details for Web of Science ID 000268949800004
View details for PubMedID 19623221
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The effect of a small heat source on PSF stability for high-contrast imaging
OPTICS EXPRESS
2009; 17 (14): 11652-11664
Abstract
High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. The Laboratory for Adaptive Optics at UC Santa Cruz is investigating limits to high-contrast imaging in support of the Gemini Planet Imager (GPI). In this paper we examine the effect of heat sources in the testbed on point-spread-function (PSF) stability. Introducing a heat source primarily introduces image motion. The GPI error budget requires image motion to be less than 0.1 lambda /D. Systematic motion of the PSF core is typically 0.01 lambda /D rms and with a 20 watt heat source introduced near the pupil plane image motion is increased to 0.02 lambda /D rms. Therefore, even a heat source as large as 20 watts near the pupil plane causes errors below the GPI requirement, but the combination of the heat source and additional air turbulence on the system introduced by changes to the enclosure or the fan of other components can produce significantly more motion. Heat also can affect the speckle pattern in the high-contrast region, but in the final instrument other sources of error should be more significant.
View details for Web of Science ID 000267761200044
View details for PubMedID 19582080
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SHAPED PUPIL DESIGN FOR THE GEMINI PLANET IMAGER
ASTROPHYSICAL JOURNAL
2009; 698 (1): 938-943
View details for DOI 10.1088/0004-637X/698/1/938
View details for Web of Science ID 000266373700079
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Stroke saturation on a MEMS deformable mirror for woofer-tweeter adaptive optics
OPTICS EXPRESS
2009; 17 (7): 5829-5844
Abstract
High-contrast imaging of extrasolar planet candidates around a main-sequence star has recently been realized from the ground using current adaptive optics (AO) systems. Advancing such observations will be a task for the Gemini Planet Imager, an upcoming "extreme" AO instrument. High-order "tweeter" and low-order "woofer" deformable mirrors (DMs) will supply a >90%-Strehl correction, a specialized coronagraph will suppress the stellar flux, and any planets can then be imaged in the "dark hole" region. Residual wavefront error scatters light into the DM-controlled dark hole, making planets difficult to image above the noise. It is crucial in this regard that the high-density tweeter, a micro-electrical mechanical systems (MEMS) DM, have sufficient stroke to deform to the shapes required by atmospheric turbulence. Laboratory experiments were conducted to determine the rate and circumstance of saturation, i.e. stroke insufficiency. A 1024-actuator 1.5-microm-stroke MEMS device was empirically tested with software Kolmogorov-turbulence screens of r(0) =10-15 cm. The MEMS when solitary suffered saturation approximately 4% of the time. Simulating a woofer DM with approximately 5-10 actuators across a 5-m primary mitigated MEMS saturation occurrence to a fraction of a percent. While no adjacent actuators were saturated at opposing positions, mid-to-high-spatial-frequency stroke did saturate more frequently than expected, implying that correlations through the influence functions are important. Analytical models underpredict the stroke requirements, so empirical studies are important.
View details for Web of Science ID 000264747500102
View details for PubMedID 19333352
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Preliminary characterization of Boston Micromachines' 4096-actuator deformable mirror
Conference on MEMS Adaptive Optics III
SPIE-INT SOC OPTICAL ENGINEERING. 2009
View details for DOI 10.1117/12.811681
View details for Web of Science ID 000285333600014
- The detection and characterization of extrasolar planets. Physics Today 2009; 62: 46
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Direct Imaging of Multiple Planets Orbiting the Star HR 8799
SCIENCE
2008; 322 (5906): 1348-1352
Abstract
Direct imaging of exoplanetary systems is a powerful technique that can reveal Jupiter-like planets in wide orbits, can enable detailed characterization of planetary atmospheres, and is a key step toward imaging Earth-like planets. Imaging detections are challenging because of the combined effect of small angular separation and large luminosity contrast between a planet and its host star. High-contrast observations with the Keck and Gemini telescopes have revealed three planets orbiting the star HR 8799, with projected separations of 24, 38, and 68 astronomical units. Multi-epoch data show counter clockwise orbital motion for all three imaged planets. The low luminosity of the companions and the estimated age of the system imply planetary masses between 5 and 13 times that of Jupiter. This system resembles a scaled-up version of the outer portion of our solar system.
View details for DOI 10.1126/science.1166585
View details for Web of Science ID 000261170600030
View details for PubMedID 19008415
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Gas and dust associated with the strange, isolated star BP piscium
ASTROPHYSICAL JOURNAL
2008; 683 (2): 1085-1103
View details for Web of Science ID 000258528100038
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Keck observations of the 2002-2003 jovian ring plane crossing
ICARUS
2008; 195 (1): 348-360
View details for DOI 10.1016/j.icarus.2007.11.029
View details for Web of Science ID 000255466100020
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Laboratory demonstration of accurate and efficient nanometer-level wavefront control for extreme adaptive optics
APPLIED OPTICS
2008; 47 (9): 1317-1326
Abstract
A 32 x 32 microelectricalmechanical systems mirror is controlled in a closed-loop adaptive optics test bed with a spatially filtered wavefront sensor (WFS), Fourier transform wavefront reconstruction, and calibration of references with a high-precision interferometer. When correcting the inherent aberration of the mirror, 0.7 nm rms phase error in the controllable band is achieved. When correcting an etched phase plate with atmospheric statistics, a dark hole 10(3) deeper than the uncontrollable phase is produced in the phase power spectral density. Compensation of the mirror's influence function is done with a Fourier filter, which results in improved loop convergence. Use of the spatial filter is shown to reduce the gain variability of the WFS in a quadcell configuration.
View details for Web of Science ID 000255048000021
View details for PubMedID 18709080
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Discovery of a Jupiter/Saturn analog with gravitational microlensing
SCIENCE
2008; 319 (5865): 927-930
Abstract
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency of solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multiple-planet systems containing analogs of all the solar system planets except Mercury. We report the detection of a multiple-planet system with microlensing. We identify two planets with masses of approximately 0.71 and approximately 0.27 times the mass of Jupiter and orbital separations of approximately 2.3 and approximately 4.6 astronomical units orbiting a primary star of mass approximately 0.50 solar mass at a distance of approximately 1.5 kiloparsecs. This system resembles a scaled version of our solar system in that the mass ratio, separation ratio, and equilibrium temperatures of the planets are similar to those of Jupiter and Saturn. These planets could not have been detected with other techniques; their discovery from only six confirmed microlensing planet detections suggests that solar system analogs may be common.
View details for DOI 10.1126/science.1151947
View details for Web of Science ID 000253165700038
View details for PubMedID 18276883
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Confidence level and sensitivity limits in high-contrast imaging
ASTROPHYSICAL JOURNAL
2008; 673 (1): 647-656
View details for Web of Science ID 000253454200051
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The Gemini Planet Imager: from science to design to construction
Conference on Adaptive Optics Systems
SPIE-INT SOC OPTICAL ENGINEERING. 2008
View details for DOI 10.1117/12.788083
View details for Web of Science ID 000261491700031
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Amplitude variations on the ExAO testbed (II)
Conference on MEMS Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2008
View details for DOI 10.1117/12.771766
View details for Web of Science ID 000255942700016
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An End-to-End Polychromatic Fresnel Propagation Model of GPI
Conference on Adaptive Optics Systems
SPIE-INT SOC OPTICAL ENGINEERING. 2008
View details for DOI 10.1117/12.789899
View details for Web of Science ID 000261491700047
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Contrast analysis and stability on the ExAO testbed
Conference on Adaptive Optics Systems
SPIE-INT SOC OPTICAL ENGINEERING. 2008
View details for DOI 10.1117/12.789452
View details for Web of Science ID 000261491700181
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Empirical measurement of MEMS stroke saturation, with implications for woofer-tweeter architectures
Conference on Adaptive Optics Systems
SPIE-INT SOC OPTICAL ENGINEERING. 2008
View details for DOI 10.1117/12.788091
View details for Web of Science ID 000261491700100
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High-contrast imaging testbed
Conference on MEMS Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2008
View details for DOI 10.1117/12.771755
View details for Web of Science ID 000255942700015
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The Gemini Deep Planet Survey
ASTROPHYSICAL JOURNAL
2007; 670 (2): 1367-1390
View details for Web of Science ID 000251238300047
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Spatially resolved observations of the forbidden SO a(1) Delta -> X-3 Sigma(-) rovibronic transition on Io during an eclipse and a volcanic eruption at Ra Patera
ICARUS
2007; 191 (1): 172-182
View details for DOI 10.1016/j.icarus.2007.04.011
View details for Web of Science ID 000250766400012
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Fourier transform wavefront control with adaptive prediction of the atmosphere
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
2007; 24 (9): 2645-2660
Abstract
Predictive Fourier control is a temporal power spectral density-based adaptive method for adaptive optics that predicts the atmosphere under the assumption of frozen flow. The predictive controller is based on Kalman filtering and a Fourier decomposition of atmospheric turbulence using the Fourier transform reconstructor. It provides a stable way to compensate for arbitrary numbers of atmospheric layers. For each Fourier mode, efficient and accurate algorithms estimate the necessary atmospheric parameters from closed-loop telemetry and determine the predictive filter, adjusting as conditions change. This prediction improves atmospheric rejection, leading to significant improvements in system performance. For a 48x48 actuator system operating at 2 kHz, five-layer prediction for all modes is achievable in under 2x10(9) floating-point operations/s.
View details for Web of Science ID 000249813000017
View details for PubMedID 17767234
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The wide brown dwarf binary Oph 1622-2405 and discovery of a wide, low-mass binary in Ophiuchus (Oph 1623-2402): A new class of young evaporating wide binaries?
ASTROPHYSICAL JOURNAL
2007; 660 (2): 1492-1506
View details for Web of Science ID 000246571300054
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Measuring the mass of a pre-main-sequence binary star through the orbit of TWA 5A
ASTRONOMICAL JOURNAL
2007; 133 (5): 2008-2014
View details for Web of Science ID 000246342200017
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Discovery of a 66 mas ultracool binary with laser guide star adaptive optics
ASTRONOMICAL JOURNAL
2007; 133 (5): 2320-2326
View details for Web of Science ID 000246342200042
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Adaptive optics for direct detection of extrasolar planets: the Gemini Planet Imager
COMPTES RENDUS PHYSIQUE
2007; 8 (3-4): 365-373
View details for DOI 10.1016/j.crhy.2007.04.007
View details for Web of Science ID 000248896900011
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GQ Lup B visible and near-infrared photometric analysis
ASTROPHYSICAL JOURNAL
2007; 654 (2): L151-L154
View details for Web of Science ID 000243383000012
- GQ Lup B Optical and Near-Infrared Photometry The Astrophysical Journal Letters 2007; 654: 151
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Amplitude variations on the ExAO testbed
Conference on Techniques and Instrumentation for Detection of Exoplanets III
SPIE-INT SOC OPTICAL ENGINEERING. 2007
View details for DOI 10.1117/12.735741
View details for Web of Science ID 000252361500030
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An interferometric wave front sensor for measuring post-coronagraph errors on large optical telescopes
2007 IEEE Aerospace Conference
IEEE. 2007: 2258–2264
View details for Web of Science ID 000251235302017
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Ground-based near infrared spectroscopy of Jupiter's ring and moons
ICARUS
2006; 185 (2): 403-415
View details for DOI 10.1016/j.icarus.2006.07.007
View details for Web of Science ID 000243446300007
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HST NICMOS imaging of the planetary-mass companion to the young brown dwarf 2MASSW J1207334-393254
ASTROPHYSICAL JOURNAL
2006; 652 (1): 724-729
View details for Web of Science ID 000242125700065
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Optimal Fourier control performance and speckle behavior in high-contrast imaging with adaptive optics
OPTICS EXPRESS
2006; 14 (17): 7499-7514
Abstract
High-contrast imaging with adaptive optics (AO) for planet detection requires a sophisticated AO control system to provide the best possible performance. We evaluate the performance improvements in terms of residual error and point-spread function intensity provided by optimal Fourier control using detailed end-to-end simulation. Intensity, however, is not the final measure of system performance. We explore image contrast through analysis and simulation results, showing that speckles caused by atmospheric errors behave very differently in a temporal fashion from speckles caused by wavefront sensor noise errors.
View details for Web of Science ID 000240164100005
View details for PubMedID 19529117
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Accurate astrometry and photometry of saturated and coronagraphic point spread functions
ASTROPHYSICAL JOURNAL
2006; 647 (1): 612-619
View details for Web of Science ID 000239647800053
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Demonstrating sub-nm closed loop MEMS flattening
OPTICS EXPRESS
2006; 14 (12): 5558-5570
Abstract
Ground based high-contrast imaging (e.g. extrasolar giant planet detection) has demanding wavefront control requirements two orders of magnitude more precise than standard adaptive optics systems. We demonstrate that these requirements can be achieved with a 1024-Micro-Electrical-Mechanical-Systems (MEMS) deformable mirror having an actuator spacing of 340 microm and a stroke of approximately 1 microm, over an active aperture 27 actuators across. We have flattened the mirror to a residual wavefront error of 0.54 nm rms within the range of controllable spatial frequencies. Individual contributors to final wavefront quality, such as voltage response and uniformity, have been identified and characterized.
View details for Web of Science ID 000238437800071
View details for PubMedID 19516724
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Angular differential imaging: A powerful high-contrast imaging technique
ASTROPHYSICAL JOURNAL
2006; 641 (1): 556-564
View details for Web of Science ID 000236817800047
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Effect of wavefront error on 10(-7) contrast measurements
OPTICS LETTERS
2006; 31 (5): 565-567
Abstract
Received October 11, 2005; accepted November 10, 2005; posted December 2, 2005 (Doc. ID 65234) We have measured a contrast of 6.5 x 10(-8) from 10 to 25 lambda/D in visible light on the Extreme Adaptive Optics testbed, using a shaped pupil for diffraction suppression. The testbed was designed with a minimal number of high-quality optics to ensure low wavefront error and uses a phase-shifting diffraction interferometer for metrology. This level of contrast is within the regime needed for imaging young Jupiter-like planets, a primary application of high-contrast imaging. We have concluded that wavefront error, not pupil quality, is the limiting error source for improved contrast in our system.
View details for Web of Science ID 000235532600001
View details for PubMedID 16570399
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Experimental demonstration of phase correction with a 32 X 32 microelectromechanical systems mirror and a spatially filtered wavefront sensor
OPTICS LETTERS
2006; 31 (3): 293-295
Abstract
A 32 x 32 microelectromechanical systems deformable mirror is controlled in closed loop with a spatially filtered Shack-Hartmann wavefront sensor and a Fourier-transform wavefront reconstruction algorithm. A phase plate based on atmospheric turbulence statistics is used to generate a 1 microm peak-valley static phase aberration. Far-field images and direct phase measurements of the residual are used to compare performance with and without the spatial filter. Use of the spatial filter reduces error in the controllable band from 20 to 6 nm rms. Residual phase power is reduced by more than a factor of 5 for all spatial frequencies up to 0.85 x 1/2d, with a maximum attenuation factor of 37.
View details for Web of Science ID 000234961100001
View details for PubMedID 16480186
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Characterizing the potential of MEMS deformable mirrors for astronomical adaptive optics
Conference on Advances in Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2006: U696–U707
View details for DOI 10.1117/12.672470
View details for Web of Science ID 000240348301006
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Extreme adaptive optics testbed: Performance and characterization of a 1024-MEMS deformable mirror
Conference on MEMS/MOEMS Components and Their Applications III
SPIE-INT SOC OPTICAL ENGINEERING. 2006
View details for DOI 10.1117/12.648977
View details for Web of Science ID 000237171400016
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Wavefront control for the Gemini Planet Imager
Conference on Advances in Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2006: U550–U561
View details for DOI 10.1117/12.672328
View details for Web of Science ID 000240348300052
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The Gemini Planet Imager
Conference on Advances in Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2006: U195–U206
View details for DOI 10.1117/12.672430
View details for Web of Science ID 000240348300020
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Extreme adaptive optics for the thirty meter telescope
Conference on Advances in Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2006: U219–U233
View details for DOI 10.1117/12.672032
View details for Web of Science ID 000240348300022
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Effects of diffraction and static wavefront errors on high-contrast imaging from the thirty meter telescope
Conference on Advances in Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2006: U807–U817
View details for DOI 10.1117/12.671667
View details for Web of Science ID 000240348301017
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Exoplanet detection with simultaneous spectral differential imaging: effects of out-of-pupil-plane optical aberrations
Conference on Ground-Based and Airborne Instrumentation for Astronomy
SPIE-INT SOC OPTICAL ENGINEERING. 2006
View details for DOI 10.1117/12.672263
View details for Web of Science ID 000240348500116
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MEMS-based extreme adaptive optics for planet detection
Conference on MEMS/MOEMS Components and Their Applications III
SPIE-INT SOC OPTICAL ENGINEERING. 2006
View details for DOI 10.1117/12.657463
View details for Web of Science ID 000237171400006
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The Extreme Adaptive Optics Testbed at UCSC: Current results and coronagraphic upgrade
Conference on Advances in Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2006: U876–U887
View details for DOI 10.1117/12.672341
View details for Web of Science ID 000240348301024
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A conceptual design for the Thirty Meter Telescope adaptive optics systems
Conference on Advances in Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2006: U119–U132
View details for DOI 10.1117/12.669422
View details for Web of Science ID 000240348300013
- The Detection and Characterization of Exoplanets Physics Today 2006; 62: 46
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Interferometric wavefront sensors for extreme adaptive optics on the Thirty Meter Telescope
Conference on Advances in Adaptive Optics II
SPIE-INT SOC OPTICAL ENGINEERING. 2006: U1757–U1765
View details for DOI 10.1117/12.672405
View details for Web of Science ID 000240348302057
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Characterizing the adaptive optics off-axis point-spread function. II. Methods for use in laser guide star observations
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
2005; 117 (834): 847-859
View details for Web of Science ID 000231113400007
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The core of NGC 6240 from Keck adaptive optics and Hubble Space Telescope NICMOS observations
ASTROPHYSICAL JOURNAL
2005; 621 (2): 738-749
View details for Web of Science ID 000227545300015
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The dynamic neptunian ring arcs: evidence for a gradual disappearance of Liberte and resonant jump of courage
ICARUS
2005; 174 (1): 263-272
View details for DOI 10.1016/j.icarus.2004.10.020
View details for Web of Science ID 000228136900019
- Speckle lifetimes in high-contrast adaptive optics 2005: 170
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Performance of the Keck Observatory adaptive-optics system
APPLIED OPTICS
2004; 43 (29): 5458-5467
Abstract
The adaptive-optics (AO) system at the W. M. Keck Observatory is characterized. We calculate the error budget of the Keck AO system operating in natural guide star mode with a near-infrared imaging camera. The measurement noise and bandwidth errors are obtained by modeling the control loops and recording residual centroids. Results of sky performance tests are presented: The AO system is shown to deliver images with average Strehl ratios of as much as 0.37 at 1.58 microm when a bright guide star is used and of 0.19 for a magnitude 12 star. The images are consistent with the predicted wave-front error based on our error budget estimates.
View details for Web of Science ID 000224509800006
View details for PubMedID 15508602
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Titan's 2 mu m surface albedo and haze optical depth in 1996-2004
GEOPHYSICAL RESEARCH LETTERS
2004; 31 (17)
View details for DOI 10.1029/2004GL019803
View details for Web of Science ID 000222779900001
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Mid-infrared observations of Van Maanen 2: No substellar companion
ASTROPHYSICAL JOURNAL
2004; 608 (2): L109-L112
View details for Web of Science ID 000222184400009
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A new 1.6-micron map of Titan's surface
GEOPHYSICAL RESEARCH LETTERS
2004; 31 (17)
View details for DOI 10.1029/2004GL019871
View details for Web of Science ID 000222325300002
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Speckle imaging of Titan at 2 microns: surface albedo, haze optical depth, and tropospheric clouds 1996-1998
ICARUS
2004; 169 (2): 429-439
View details for DOI 10.1016/j.icarus.2003.12.026
View details for Web of Science ID 000221604300012
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A multiwavelength scattered light analysis of the dust grain population in the GG Tauri circumbinary ring
ASTROPHYSICAL JOURNAL
2004; 606 (2): 969-982
View details for Web of Science ID 000221261900028
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Keck AO observations of Io in and out of eclipse
ICARUS
2004; 169 (1): 250-263
View details for DOI 10.1016/j.icarus.2003.08.025
View details for Web of Science ID 000221180400014
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Spatially filtered wave-front sensor for high-order adaptive optics
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
2004; 21 (5): 810-819
Abstract
Adaptive optics (AO) systems take sampled measurements of the wave-front phase. Because in the general case the spatial-frequency content of the phase aberration is not band limited, aliasing will occur. This aliasing will cause increased residual error and increased scattered light in the point-spread function (PSF). The spatially filtered wave-front sensor (SFWFS) mitigates this phenomenon by using a field stop at a focal plane before the wave-front sensor. This stop acts as a low-pass filter on the phase, significantly reducing the high-spatial-frequency content phase seen by the wave-front sensor at moderate to high Strehl ratios. We study the properties and performance of the SFWFS for open- and closed-loop correction of atmospheric turbulence, segmented-primary-mirror errors, and sensing with broadband light. In closed loop the filter reduces high-spatial-frequency phase power by a factor of 10(3) to 10(8). In a full AO-system simulation, this translates to a reduction by up to 625 times in the residual error power due to aliasing over a specific spatial frequency range. The final PSF (generated with apodization of the pupil) has up to a 100 times reduction in intensity out to lambda/2d.
View details for Web of Science ID 000220982700016
View details for PubMedID 15139434
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HD 199143 and HD 358623: Two recently identified members of the beta Pictoris Moving Group
ASTRONOMY & ASTROPHYSICS
2004; 414 (1): 175-179
View details for DOI 10.1051/0004-6361:20031598
View details for Web of Science ID 000188009900019
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Characterization of adaptive optics at Keck Observatory: Part II
Conference on Advancements in Adaptive Optics
SPIE-INT SOC OPTICAL ENGINEERING. 2004: 174–183
View details for Web of Science ID 000225417900017
- Characterization of Keck Adaptive Optics II 2004: 174
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Is that really your Strehl ratio?
Conference on Advancements in Adaptive Optics
SPIE-INT SOC OPTICAL ENGINEERING. 2004: 504–515
View details for DOI 10.1117/12.549115
View details for Web of Science ID 000225417900050
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Coronagraph design for an extreme adaptive optics system with spatially-filtered wavefront sensing on segmented telescopes
Conference on Advancements in Adaptive Optics
SPIE-INT SOC OPTICAL ENGINEERING. 2004: 535–544
View details for DOI 10.1117/12.551939
View details for Web of Science ID 000225417900053
- Titan: 2 micron surface albedo and haze optical depth in 1996-1998 Icarus 2004; 169: 429
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Science camera calibration for extreme adaptive optics
Conference on Advancements in Adaptive Optics
SPIE-INT SOC OPTICAL ENGINEERING. 2004: 370–378
View details for DOI 10.1117/12.552362
View details for Web of Science ID 000225417900036
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eXtreme Adaptive Optics Planet Imager: Overview and status
Conference on Advancements in Adaptive Optics
SPIE-INT SOC OPTICAL ENGINEERING. 2004: 359–369
View details for DOI 10.1117/12.552188
View details for Web of Science ID 000225417900035
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Extreme adaptive optics testbed: Results and future work
Conference on Advancements in Adaptive Optics
SPIE-INT SOC OPTICAL ENGINEERING. 2004: 954–959
View details for DOI 10.1117/12.551762
View details for Web of Science ID 000225417900097
- No evidence for dust around the Beta Pictoris moving group stars HD 199143 and HD 358623 Astronomy and Astrophysics 2004; 414: 175
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The altitude of Neptune cloud features from high-spatial-resolution near-infrared spectra
ICARUS
2003; 166 (2): 359-374
View details for DOI 10.1016/j.icarus.2003.07.006
View details for Web of Science ID 000187231000012
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Speckle imaging of volcanic hotspots on Io with the Keck telescope
ICARUS
2003; 165 (1): 137-143
View details for DOI 10.1016/S0019-1035(03)00168-4
View details for Web of Science ID 000185338200011
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Deep keck adaptive optics searches for extrasolar planets in the dust of epsilon Eridani and Vega
ASTROPHYSICAL JOURNAL
2003; 594 (1): 538-544
View details for Web of Science ID 000185087400044
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Experimental validation of Fourier-transform wave-front reconstruction at the Palomar Observatory
OPTICS LETTERS
2003; 28 (10): 798-800
Abstract
Wave-front reconstruction with use of the Fourier transform has been validated through theory and simulation. This method provides a dramatic reduction in computational costs for large adaptive (AO) systems. Because such a reconstructor can be expressed as a matrix, it can be used as an alternative in a matrix-based AO control system. This was done with the Palomar Observatory AO system on the 200-in. Hale telescope. Results of these tests indicate that Fourier-transform wave-front reconstruction works in a real system. For both bright and dim stars, a Hudgin-geometry Fourier-transform method produced performance comparable to that of the Palomar Adaptive Optics least squares. The Fried-geometry method had a noticeable Strehl ratio performance degradation of 0.043 in the K band (165-nm rms wave-front error added in quadrature) on a dim star.
View details for Web of Science ID 000182634500012
View details for PubMedID 12779150
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Keck AO observations of Io in and out of eclipse
Conference on Discoveries and Research Prospects from 6- to 10- Meter-Class Telescopes II
SPIE-INT SOC OPTICAL ENGINEERING. 2003: 139–149
View details for Web of Science ID 000181979900014
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Characterization of adaptive optics at Keck Observatory
Conference on Astronomical Adaptive Optics Systems and Applications
SPIE-INT SOC OPTICAL ENGINEERING. 2003: 1–10
View details for Web of Science ID 000188421300001
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A Keck adaptive optics search for young extrasolar planets
Conference on Scientific Frontiers in Research on Extrasolar Planets
ASTRONOMICAL SOC PACIFIC. 2003: 91–94
View details for Web of Science ID 000186106100017
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Keck near-infrared observations of the Orion Proplyds: Initial results
Conference on Discoveries and Research Prospects from 6- to 10- Meter-Class Telescopes II
SPIE-INT SOC OPTICAL ENGINEERING. 2003: 364–374
View details for Web of Science ID 000181979900036
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Cloud structures on Neptune observed with Keck Telescope adaptive optics
ASTRONOMICAL JOURNAL
2003; 125 (1): 364-375
View details for Web of Science ID 000179931600029
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Inter-decadal variations of east Asian monsoon and its relation with precipitations over North china
Conference on Atmospheric and Oceanic Processes, Dynamics, and Climate Change
SPIE-INT SOC OPTICAL ENGINEERING. 2003: 1–10
View details for Web of Science ID 000182656000001
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Extreme adaptive optics planet imager: XAOPI
Conference on Techniques and Instrumentation for Detection of Exoplanets
SPIE-INT SOC OPTICAL ENGINEERING. 2003: 272–282
View details for Web of Science ID 000187838700027
- Deep adaptive optics searches for planets in the dust of Epsilon Eridani and Vega The Astrophysical Journal 2003; 594: 538
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Initial concepts for CELT adaptive optics
Conference on Adaptive Optical System Technologies II
SPIE-INT SOC OPTICAL ENGINEERING. 2003: 1165–1174
View details for Web of Science ID 000181980700120
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Wave-front control for extreme adaptive optics
Conference on Astronomical Adaptive Optics Systems and Applications
SPIE-INT SOC OPTICAL ENGINEERING. 2003: 190–200
View details for Web of Science ID 000188421300020
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Recent science and engineering results with the laser guide star adaptive optics system at Lick Observatory
Conference on Adaptive Optical System Technologies II
SPIE-INT SOC OPTICAL ENGINEERING. 2003: 354–359
View details for Web of Science ID 000181980700039
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Titan's clouds from Gemini and Keck adaptive optics imaging
ASTROPHYSICAL JOURNAL
2002; 581 (2): 1399-1406
View details for Web of Science ID 000179914300053
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Speckle decorrelation and dynamic range in speckle noise-limited imaging
ASTROPHYSICAL JOURNAL
2002; 581 (1): L59-L62
View details for Web of Science ID 000179682200014
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Stellar companions to stars with planets
ASTROPHYSICAL JOURNAL
2002; 581 (1): 654-665
View details for Web of Science ID 000179681500048
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Keck adaptive optics images of Uranus and its rings
ICARUS
2002; 160 (2): 359-374
View details for DOI 10.1006/icar.2002.6966
View details for Web of Science ID 000179988000010
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Characterizing the adaptive optics off-axis point-spread function. I. A semiempirical method for use in natural guide star observations
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
2002; 114 (801): 1267-1280
View details for Web of Science ID 000178972200011
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High-resolution Keck adaptive optics imaging of violent volcanic activity on Io
ICARUS
2002; 160 (1): 124-131
View details for DOI 10.1006/icar.2002.6955
View details for Web of Science ID 000179364900013
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Titan's atmosphere in late southern spring observed with adaptive optics on the W.M. Keck II 10-meter telescope
ICARUS
2002; 157 (1): 254-258
View details for DOI 10.1006/icar.2002.6831
View details for Web of Science ID 000175929000021
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High-resolution infrared imaging of Neptune from the Keck Telescope
ICARUS
2002; 156 (1): 1-15
View details for DOI 10.1006/icar.2001.6766
View details for Web of Science ID 000175374300001
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The surface of Titan from adaptive optics observations
24th General Assembly of the International-Astronomical-Union
ASTRONOMICAL SOC PACIFIC. 2002: 629–629
View details for Web of Science ID 000178493500164
- Practical high-order adaptive optics systems for extrasolar planet searches 2002: 60
- Science with laser guide stars at Lick Observatory 2002: 336
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Near-infrared observations of Neptune's tropospheric cloud layer with the Lick Observatory adaptive optics system
ASTRONOMICAL JOURNAL
2001; 122 (3): 1636-1643
View details for Web of Science ID 000170997700044
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Science with Laser Guide Stars at Lick Observatory
Conference on Adaptive Optics Systems and Technology II
SPIE-INT SOC OPTICAL ENGINEERING. 2001: 336–342
View details for Web of Science ID 000175163000033
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High resolution imaging with AEOS
Conference on Multifrequency Electronic/Photonic Devices and Systems for Dual-Use Applications
SPIE-INT SOC OPTICAL ENGINEERING. 2001: 178–186
View details for Web of Science ID 000174396400020
- Keck adaptive optics imaging of TWA5 and 6 Young Stars near Earth edited by Jaywaharda, R. 2001: 309
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Astronomical coronagraphy with high order adaptive optics
Conference on Multifrequency Electronic/Photonic Devices and Systems for Dual-Use Applications
SPIE-INT SOC OPTICAL ENGINEERING. 2001: 290–297
View details for Web of Science ID 000174396400032
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Practical high-order adaptive optics systems for extrasolar planet searches
Conference on Adaptive Optics Systems and Technology II
SPIE-INT SOC OPTICAL ENGINEERING. 2001: 60–68
View details for Web of Science ID 000175163000007
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Keck adaptive optics observations of TW hydrae association members
Workshop on Young Stars Near Earth
ASTRONOMICAL SOC PACIFIC. 2001: 309–315
View details for Web of Science ID 000175724200051
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First light adaptive optics images from the Keck II Telescope: A new era of high angular resolution imagery
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
2000; 112 (769): 315-319
View details for Web of Science ID 000085788900003
- Initial performance of the Keck adaptive optics system 2000: 600
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Initial performance of the Keck AO wavefront controller system
Conference on Adaptive Optical Systems Technology
SPIE-INT SOC OPTICAL ENGINEERING. 2000: 600–607
View details for Web of Science ID 000089218600068
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IRCAL: The infrared camera for adaptive optics at Lick Observatory
Conference on Optical and IR Telescope Instrumentation and Detectors
SPIE-INT SOC OPTICAL ENGINEERING. 2000: 814–821
View details for Web of Science ID 000089706500084
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Adaptive optics high resolution spectroscopy: Present status and future direction
International Conference on Imaging the Universe in 3 Dimensions
ASTRONOMICAL SOC PACIFIC. 2000: 568–572
View details for Web of Science ID 000087281800077
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Etched silicon gratings for NGST
NGST Science and Technology Exposition Conference
ASTRONOMICAL SOC PACIFIC. 2000: 457–461
View details for Web of Science ID 000089621100053
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Progress with the Lick adaptive optics system
Conference on Adaptive Optical Systems Technology
SPIE-INT SOC OPTICAL ENGINEERING. 2000: 63–70
View details for Web of Science ID 000089218600008
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Neptune and Titan observed with Keck Telescope adaptive optics
Conference on Adaptive Optical Systems Technology
SPIE-INT SOC OPTICAL ENGINEERING. 2000: 803–810
View details for Web of Science ID 000089218600088
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Titan: High-resolution speckle images from the Keck Telescope
ICARUS
1999; 139 (2): 189-201
View details for Web of Science ID 000081469500003
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Adaptive optics high resolution spectroscopy: Present status and future direction
Conference on Adaptive Optics Systems and Technology
SPIE-INT SOC OPTICAL ENGINEERING. 1999: 174–183
View details for Web of Science ID 000083637400018
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Improved performance of the laser guide star adaptive optics system at Lick Observatory
Conference on Adaptive Optics Systems and Technology
SPIE-INT SOC OPTICAL ENGINEERING. 1999: 2–7
View details for Web of Science ID 000083637400001
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A cw, high-power, conduction-cooled, edge-pumped slab laser
Conference on Solid State Lasers VIII
SPIE - INT SOC OPTICAL ENGINEERING. 1999: 2–7
View details for Web of Science ID 000080658300001
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Phase retrieval techniques for adaptive optics
SPIE Conference on Adaptive Optical System Technologies
SPIE-INT SOC OPTICAL ENGINEERING. 1998: 658–667
View details for Web of Science ID 000076793400072
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Direct imaging of extra-solar planets
Workshop on Brown Dwarfs and Extrasolar Planets
ASTRONOMICAL SOC PACIFIC. 1998: 262–270
View details for Web of Science ID 000073481100037
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Observing techniques for astronomical laser guide star adaptive optics
SPIE Conference on Adaptive Optical System Technologies
SPIE-INT SOC OPTICAL ENGINEERING. 1998: 277–281
View details for Web of Science ID 000076793400030
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Image improvement from a sodium-layer laser guide star adaptive optics system
SCIENCE
1997; 277 (5332): 1649-1652
View details for Web of Science ID A1997XV68400046
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A companion to the white dwarf G261-43
ASTRONOMICAL JOURNAL
1997; 113 (2): 764-766
View details for Web of Science ID A1997WE93400029
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First significant image improvement from a sodium-layer laser guide star adaptive optics system at Lick Observatory
Conference on Adaptive Optics and Applications
SPIE-INT SOC OPTICAL ENGINEERING. 1997: 240–248
View details for Web of Science ID A1997BJ86X00026
- Initial results from the Lick Observatory Laser Guide Star Adaptive Optics system 1996: 75
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THE BROWN DWARF CANDIDATE 0918-0023B IS A DISTANT COMPACT GALAXY
ASTROPHYSICAL JOURNAL
1995; 449 (2): L117-L118
View details for Web of Science ID A1995RP42500005
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UBVRI PHOTOMETRY OF THE TYPE-IA SN-1994D IN NGC-4526
ASTRONOMICAL JOURNAL
1995; 109 (5): 2121-2133
View details for Web of Science ID A1995QV64500019
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RADIAL-VELOCITIES OF VERY-LOW MASS STARS AND CANDIDATE BROWN DWARF MEMBERS OF THE HYADES AND PLEIADES
ASTRONOMICAL JOURNAL
1994; 108 (1): 160-174
View details for Web of Science ID A1994NT50100015
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A NEAR-INFRARED IMAGING SEARCH FOR LOW-MASS COMPANIONS TO HYADES STARS
Conference on Infrared Astronomy with Arrays: The Next Generation
KLUWER ACADEMIC PUBL. 1994: 231–234
View details for Web of Science ID A1994BA82J00073
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PERFORMANCE AND RESULTS WITH A DOUBLE-BEAM INFRARED CAMERA
8th SPIE Conference on Instrumentation in Astronomy
SPIE - INT SOC OPTICAL ENGINEERING. 1994: 457–466
View details for Web of Science ID A1994BA90A00048
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THE UCLA DOUBLE-BEAM INFRARED CAMERA SYSTEM
Conference on Infrared Detector and Instrumentation
SPIE - INT SOC OPTICAL ENGINEERING. 1993: 513–533
View details for Web of Science ID A1993BZ73X00053
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THE OEDIPUS EXPERIMENT - ANALYSIS OF THE CURRENT VOLTAGE DATA
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
1991; 96 (A10): 17879-17890
View details for Web of Science ID A1991GJ37100024