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

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1117/12.2055753
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Name affiliation
  1. National Research Council of Canada. National Science Infrastructure
FormatText, Article
Proceedings titleGround-Based and Airborne Instrumentation for Astronomy V
Series titleProceedings of SPIE; no. 9147
ConferenceGround-Based and Airborne Instrumentation for Astronomy V, June 22-26, 2014
ISSN0277-786X
1996-756X
ISBN9780819496157
Article number914755
SubjectAdaptive optics; Astronomy; Extrasolar planets; Infrared devices; Signal to noise ratio; Spectrophotometry; Stars; astrometry; Exo-planets; Gemini Planet Imager; GPI; High contrast imaging; Satellites
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.
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PublisherSPIE
LanguageEnglish
Peer reviewedYes
NPARC number21275483
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