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

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DOIResolve DOI: http://doi.org/10.1117/12.2055753
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TypeArticle
Proceedings titleSPIE - International Society for Optical Engineering. Proceedings
ConferenceGround-Based and Airborne Instrumentation for Astronomy V, 22 June 2014 through 26 June 2014
ISSN0277-786X
ISBN9780819496157
Volume9147
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
AbstractThe 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.
Publication date
PublisherSPIE
LanguageEnglish
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21275483
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Record identifier17e9a212-5008-472b-865a-1d3c73dcc2c8
Record created2015-07-14
Record modified2017-04-24
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