TY - JOUR
T1 - Revised astrometric calibration of the Gemini Planet Imager
AU - De Rosa, Robert J.
AU - Nguyen, Meiji M.
AU - Chilcote, Jeffrey
AU - MacIntosh, Bruce
AU - Perrin, Marshall D.
AU - Konopacky, Quinn
AU - Wang, Jason J.
AU - Duchêne, Gaspard
AU - Nielsen, Eric L.
AU - Rameau, Julien
AU - Ammons, S. Mark
AU - Bailey, Vanessa P.
AU - Barman, Travis
AU - Bulger, Joanna
AU - Cotten, Tara
AU - Doyon, Rene
AU - Esposito, Thomas M.
AU - Fitzgerald, Michael P.
AU - Follette, Katherine B.
AU - Gerard, Benjamin L.
AU - Goodsell, Stephen J.
AU - Graham, James R.
AU - Greenbaum, Alexandra Z.
AU - Hibon, Pascale
AU - Hung, Li Wei
AU - Ingraham, Patrick
AU - Kalas, Paul
AU - Larkin, James E.
AU - Maire, Jérôme
AU - Marchis, Franck
AU - Marley, Mark S.
AU - Marois, Christian
AU - Metchev, Stanimir
AU - Millar-Blanchaer, Maxwell A.
AU - Oppenheimer, Rebecca
AU - Palmer, David
AU - Patience, Jennifer
AU - Poyneer, Lisa
AU - Pueyo, Laurent
AU - Rajan, Abhijith
AU - Rantakyrö, Fredrik T.
AU - Ruffio, Jean Baptiste
AU - Savransky, Dmitry
AU - Schneider, Adam C.
AU - Sivaramakrishnan, Anand
AU - Song, Inseok
AU - Soummer, Remi
AU - Thomas, Sandrine
AU - Kent Wallace, J.
AU - Ward-Duong, Kimberly
AU - Wiktorowicz, Sloane
AU - Wolff, Schuyler
N1 - Publisher Copyright:
© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE).
PY - 2020/1/1
Y1 - 2020/1/1
N2 - We present a revision to the astrometric calibration of the Gemini Planet Imager (GPI), an instrument designed to achieve the high contrast at small angular separations necessary to image substellar and planetary-mass companions around nearby, young stars. We identified several issues with the GPI data reduction pipeline (DRP) that significantly affected the determination of the angle of north in reduced GPI images. As well as introducing a small error in position angle measurements for targets observed at small zenith distances, this error led to a significant error in the previous astrometric calibration that has affected all subsequent astrometric measurements. We present a detailed description of these issues and how they were corrected. We reduced GPI observations of calibration binaries taken periodically since the instrument was commissioned in 2014 using an updated version of the DRP. These measurements were compared to observations obtained with the NIRC2 instrument on Keck II, an instrument with an excellent astrometric calibration, allowing us to derive an updated plate scale and north offset angle for GPI. This revised astrometric calibration should be used to calibrate all measurements obtained with GPI for the purposes of precision astrometry.
AB - We present a revision to the astrometric calibration of the Gemini Planet Imager (GPI), an instrument designed to achieve the high contrast at small angular separations necessary to image substellar and planetary-mass companions around nearby, young stars. We identified several issues with the GPI data reduction pipeline (DRP) that significantly affected the determination of the angle of north in reduced GPI images. As well as introducing a small error in position angle measurements for targets observed at small zenith distances, this error led to a significant error in the previous astrometric calibration that has affected all subsequent astrometric measurements. We present a detailed description of these issues and how they were corrected. We reduced GPI observations of calibration binaries taken periodically since the instrument was commissioned in 2014 using an updated version of the DRP. These measurements were compared to observations obtained with the NIRC2 instrument on Keck II, an instrument with an excellent astrometric calibration, allowing us to derive an updated plate scale and north offset angle for GPI. This revised astrometric calibration should be used to calibrate all measurements obtained with GPI for the purposes of precision astrometry.
KW - Gemini Planet Imager
KW - astrometric calibration
KW - data processing
KW - high-contrast imaging
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U2 - 10.1117/1.JATIS.6.1.015006
DO - 10.1117/1.JATIS.6.1.015006
M3 - Article
AN - SCOPUS:85082951769
SN - 2329-4124
VL - 6
JO - Journal of Astronomical Telescopes, Instruments, and Systems
JF - Journal of Astronomical Telescopes, Instruments, and Systems
IS - 1
M1 - 015006
ER -