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Proceedings Paper

Status and performance of the Gemini Planet Imager adaptive optics system
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Paper Abstract

The Gemini Planet Imager is a high-contrast near-infrared instrument specifically designed to image exoplanets and circumstellar disks over a narrow field of view. We use science data and AO telemetry taken during the first 1.5 yr of the GPI Exoplanet Survey to quantify the performance of the AO system. In a typical 60 sec H-band exposure, GPI achieves a 5σ raw contrast of 10−4 at 0.4"; typical final 5σ contrasts for full 1 hr sequences are more than 10 times better than raw contrasts. We find that contrast is limited by bandwidth wavefront error over much of the PSF. Preliminary exploratory factor analysis can explain 60{70% of the variance in raw contrasts with combinations of seeing and wavefront error metrics. We also examine the effect of higher loop gains on contrast by comparing wavefront error maps reconstructed from AO telemetry to concurrent IFS images. These results point to several ways that GPI performance could be improved in software or hardware.

Paper Details

Date Published: 26 July 2016
PDF: 15 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99090V (26 July 2016); doi: 10.1117/12.2233172
Show Author Affiliations
Vanessa P. Bailey, Stanford Univ. (United States)
Lisa A. Poyneer, Lawrence Livermore National Lab. (United States)
Bruce A. Macintosh, Stanford Univ. (United States)
Dmitry Savransky, Cornell Univ. (United States)
Jason J. Wang, Univ. of California, Berkeley (United States)
Robert J. De Rosa, Univ. of California, Berkeley (United States)
Katherine B. Follette, Stanford Univ. (United States)
S. Mark Ammons, Lawrence Livermore National Lab. (United States)
Thomas Hayward, Gemini Observatory (Chile)
Patrick Ingraham, Large Synoptic Survey Telescope (United States)
Jérôme Maire, Univ. of Toronto (Canada)
David W. Palmer, Lawrence Livermore National Lab. (United States)
Marshall D. Perrin, Space Telescope Science Institute (United States)
Abhijith Rajan, Arizona State Univ. (United States)
Fredrik T. Rantakyrö, Gemini Observatory (Chile)
Sandrine Thomas, Large Synoptic Survey Telescope (United States)
Jean-Pierre Véran, NRC Herzberg Institute of Astrophysics (Canada)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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