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Proceedings Paper

Gemini planet imager observational calibrations VIII: characterization and role of satellite spots
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Paper Abstract

The Gemini Planet Imager (GPI) combines extreme adaptive optics, an integral field spectrograph, and a high performance coronagraph to directly image extrasolar planets in the near-infrared. Because the coronagraph blocks most of the light from the star, it prevents the properties of the host star from being measured directly. Instead, satellite spots, which are created by diffraction from a square grid in the pupil plane, can be used to locate the star and extract its spectrum. We describe the techniques implemented into the GPI Data Reduction Pipeline to measure the properties of the satellite spots and discuss the precision of the reconstructed astrometry and spectrophotometry of the occulted star. We find the astrometric precision of the satellite spots in an H-band datacube to be 0.05 pixels and is best when individual satellite spots have a signal to noise ratio (SNR) of > 20. In regards to satellite spot spectrophotometry, we find that the total flux from the satellite spots is stable to ~7% and scales linearly with central star brightness and that the shape of the satellite spot spectrum varies on the 2% level.

Paper Details

Date Published: 24 July 2014
PDF: 15 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914755 (24 July 2014); doi: 10.1117/12.2055753
Show Author Affiliations
Jason J. Wang, Univ. of California, Berkeley (United States)
Abhijith Rajan, Arizona State Univ. (United States)
James R. Graham, Univ. of California, Berkeley (United States)
Dmitry Savransky, Cornell Univ. (United States)
Patrick J. Ingraham, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Kimberly Ward-Duong, Arizona State Univ. (United States)
Jennifer Patience, Arizona State Univ. (United States)
Robert J. De Rosa, Arizona State Univ. (United States)
Univ. of Exeter (United Kingdom)
Joanna Bulger, Arizona State Univ. (United States)
Anand Sivaramakrishnan, Space Telescope Science Institute (United States)
Marshall D. Perrin, Space Telescope Science Institute (United States)
Sandrine J. Thomas, NASA Ames Research Ctr. (United States)
Univ. of California, Santa Cruz (United States)
Naru Sadakuni, Gemini Observatory (Chile)
Alexandra Z. Greenbaum, Johns Hopkins Univ. (United States)
Space Telescope Science Institute (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Christian Marois, NRC - Herzberg Institute of Astrophysics (Canada)
Univ. of Victoria (Canada)
Ben R. Oppenheimer, American Museum of Natural History (United States)
Paul Kalas, Univ. of California, Berkeley (United States)
Andrew Cardwell, Gemini Observatory (Chile)
Stephen Goodsell, Gemini Observatory (Chile)
Pascale Hibon, Gemini Observatory (Chile)
Fredrik T Rantakyrö, Gemini Observatory (Chile)

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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