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Proceedings Paper

Gemini planet imager observational calibrations V: astrometry and distortion
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Paper Abstract

We present the results of both laboratory and on sky astrometric characterization of the Gemini Planet Imager (GPI). This characterization includes measurement of the pixel scale* of the integral field spectrograph (IFS), the position of the detector with respect to north, and optical distortion. Two of these three quantities (pixel scale and distortion) were measured in the laboratory using two transparent grids of spots, one with a square pattern and the other with a random pattern. The pixel scale in the laboratory was also estimate using small movements of the artificial star unit (ASU) in the GPI adaptive optics system. On sky, the pixel scale and the north angle are determined using a number of known binary or multiple systems and Solar System objects, a subsample of which had concurrent measurements at Keck Observatory. Our current estimate of the GPI pixel scale is 14.14 ± 0.01 millarcseconds/pixel, and the north angle is -1.00 ± 0.03°. Distortion is shown to be small, with an average positional residual of 0.26 pixels over the field of view, and is corrected using a 5th order polynomial. We also present results from Monte Carlo simulations of the GPI Exoplanet Survey (GPIES) assuming GPI achieves ~1 milliarcsecond relative astrometric precision. We find that with this precision, we will be able to constrain the eccentricities of all detected planets, and possibly determine the underlying eccentricity distribution of widely separated Jovians.

Paper Details

Date Published: 28 July 2014
PDF: 16 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914784 (28 July 2014); doi: 10.1117/12.2056646
Show Author Affiliations
Quinn M. Konopacky, Dunlap Institute for Astronomy Astrophysics, Univ. of Toronto (Canada)
Sandrine J. Thomas, NASA Ames Research Ctr. (United States)
Bruce A. Macintosh, Stanford Univ. (United States)
Lawrence Livermore National Lab. (United States)
Daren Dillon, Univ. of California Observatories (United States)
Naru Sadakuni, Univ. of California Observatories (United States)
Gemini Observatory (Chile)
Jérôme Maire, Dunlap Institute for Astronomy and Astrophysics, Univ. of Toronto (Canada)
Michael Fitzgerald, Univ. of California, Los Angeles (United States)
Sasha Hinkley, California Institute of Technology (United States)
Paul Kalas, Univ. of California, Berkeley (United States)
Thomas Esposito, Univ. of California, Los Angeles (United States)
Christian Marois, NRC - Dominion Astrophysical Observatory (Canada)
Patrick J. Ingraham, Stanford Univ. (United States)
Franck Marchis, SETI Institute (United States)
Marshall D. Perrin, Space Telescope Science Institute (United States)
James R. Graham, Univ. of California, Berkeley (United States)
Jason J. Wang, Univ. of California, Berkeley (United States)
Robert J. De Rosa, Arizona State Univ. (United States)
Univ. of Exeter (United Kingdom)
Katie Morzinski, Steward Observatory, The Univ. of Arizona (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Jeffrey K. Chilcote, Univ. of California, Los Angeles (United States)
James E. Larkin, Univ. of California, Los Angeles (United States)
Daniel Fabrycky, The Univ. of Chicago (United States)
Stephen J. Goodsell, Gemini Observatory (Chile)
Ben R. Oppenheimer, American Museum of Natural History (United States)
Jenny Patience, Arizona State Univ. (United States)
Leslie Saddlemyer, NRC - Dominion Astrophysical Observatory (Canada)
Anand Sivaramakrishnan, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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