@inproceedings{8586f898e1ba49b0aa8f579f1538767b,
title = "Gemini planet imager observational calibrations VIII: Characterization and role of satellite spots",
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.",
keywords = "GPI, Gemini Planet Imager, astrometry, exoplanets, high contrast imaging, spectrophotometry",
author = "Wang, {Jason J.} and Abhijith Rajan and Graham, {James R.} and Dmitry Savransky and Ingraham, {Patrick J.} and Kimberly Ward-Duong and Jennifer Patience and {De Rosa}, {Robert J.} and Joanna Bulger and Anand Sivaramakrishnan and Perrin, {Marshall D.} and Thomas, {Sandrine J.} and Naru Sadakuni and Greenbaum, {Alexandra Z.} and Laurent Pueyo and Christian Marois and Oppenheimer, {Ben R.} and Paul Kalas and Andrew Cardwell and Stephen Goodsell and Pascale Hibon and Rantakyr{\"o}, {Fredrik T.}",
year = "2014",
doi = "10.1117/12.2055753",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Ramsay, {Suzanne K.} and McLean, {Ian S.} and Hideki Takami",
booktitle = "Ground-Based and Airborne Instrumentation for Astronomy V",
note = "Ground-Based and Airborne Instrumentation for Astronomy V ; Conference date: 22-06-2014 Through 26-06-2014",
}