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Proceedings Paper

Gemini planet imager observational calibrations X: non-redundant masking on GPI
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Paper Abstract

The Gemini Planet Imager (GPI) Extreme Adaptive Optics Coronograph contains an interferometric mode: a 10-hole non-redundant mask (NRM) in its pupil wheel. GPI operates at Y, J, H, and K bands, using an integral field unit spectrograph (IFS) to obtain spectral data at every image pixel. NRM on GPI is capable of imaging with a half resolution element inner working angle at moderate contrast, probing the region behind the coronagraphic spot. The fine features of the NRM PSF can provide a reliable check on the plate scale, while also acting as an attenuator for spectral standard calibrators that would otherwise saturate the full pupil. NRM commissioning data provides details about wavefront error in the optics as well as operations of adaptive optics control without pointing control from the calibration system. We compare lab and on-sky results to evaluate systematic instrument properties and examine the stability data in consecutive exposures. We discuss early on-sky performance, comparing images from integration and tests with the first on-sky images, and demonstrate resolving a known binary. We discuss the status of NRM and implications for future science with this mode.

Paper Details

Date Published: 24 July 2014
PDF: 14 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91477B (24 July 2014); doi: 10.1117/12.2056429
Show Author Affiliations
Alexandra Z. Greenbaum, Johns Hopkins Univ. (United States)
Anthony Cheetham, The Univ. of Sydney (Australia)
Anand Sivaramakrishnan, Space Telescope Science Institute (United States)
Peter Tuthill, Space Telescope Science Institute (Australia)
Barnaby Norris, Space Telescope Science Institute (Australia)
Laurent Pueyo, The Univ. of Sydney (United States)
Naru Sadakuni, Gemini Observatory (Chile)
Fredrik Rantakyrö, Gemini Observatory (Chile)
Pascale Hibon, Gemini Observatory (Chile)
Stephen Goodsell, Gemini Observatory (Chile)
Markus Hartung, Gemini Observatory (Chile)
Andrew Serio, Gemini Observatory (Chile)
Andrew Cardwell, Gemini Observatory (Chile)
Lisa Poyneer, Lawrence Livermore National Lab. (United States)
Bruce Macintosh, Lawrence Livermore National Lab. (United States)
Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Dmitry Savransky, Cornell Univ. (United States)
Marshall D. Perrin, The Univ. of Sydney (Australia)
Schuyler Wolff, Johns Hopkins Univ. (United States)
Patrick Ingraham, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Sandrine Thomas, NASA Ames Research Ctr. (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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