Revised astrometric calibration of the Gemini Planet Imager

Robert J. De Rosa; Meiji M. Nguyen; Jeffrey Chilcote; Bruce MacIntosh; Marshall D. Perrin; Quinn Konopacky; Jason J. Wang; Gaspard Duchêne; Eric L. Nielsen; Julien Rameau; S. Mark Ammons; Vanessa P. Bailey; Travis Barman; Joanna Bulger; Tara Cotten; Rene Doyon; Thomas M. Esposito; Michael P. Fitzgerald; Katherine B. Follette; Benjamin L. Gerard; Stephen J. Goodsell; James R. Graham; Alexandra Z. Greenbaum; Pascale Hibon; Li Wei Hung; Patrick Ingraham; Paul Kalas; James E. Larkin; Jérôme Maire; Franck Marchis; Mark S. Marley; Christian Marois; Stanimir Metchev; Maxwell A. Millar-Blanchaer; Rebecca Oppenheimer; David Palmer; Jennifer Patience; Lisa Poyneer; Laurent Pueyo; Abhijith Rajan; Fredrik T. Rantakyrö; Jean Baptiste Ruffio; Dmitry Savransky; Adam C. Schneider; Anand Sivaramakrishnan; Inseok Song; Remi Soummer; Sandrine Thomas; J. Kent Wallace; Kimberly Ward-Duong; Sloane Wiktorowicz; Schuyler Wolff

doi:10.1117/1.JATIS.6.1.015006

Revised astrometric calibration of the Gemini Planet Imager

Robert J. De Rosa, Meiji M. Nguyen, Jeffrey Chilcote, Bruce MacIntosh, Marshall D. Perrin, Quinn Konopacky, Jason J. Wang, Gaspard Duchêne, Eric L. Nielsen, Julien Rameau, S. Mark Ammons, Vanessa P. Bailey, Travis Barman, Joanna Bulger, Tara Cotten, Rene Doyon, Thomas M. Esposito, Michael P. Fitzgerald, Katherine B. Follette, Benjamin L. GerardStephen J. Goodsell, James R. Graham, Alexandra Z. Greenbaum, Pascale Hibon, Li Wei Hung, Patrick Ingraham, Paul Kalas, James E. Larkin, Jérôme Maire, Franck Marchis, Mark S. Marley, Christian Marois, Stanimir Metchev, Maxwell A. Millar-Blanchaer, Rebecca Oppenheimer, David Palmer, Jennifer Patience, Lisa Poyneer, Laurent Pueyo, Abhijith Rajan, Fredrik T. Rantakyrö, Jean Baptiste Ruffio, Dmitry Savransky, Adam C. Schneider, Anand Sivaramakrishnan, Inseok Song, Remi Soummer, Sandrine Thomas, J. Kent Wallace, Kimberly Ward-Duong, Sloane Wiktorowicz, Schuyler Wolff

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18 Scopus citations

Abstract

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.

Original language	English (US)
Article number	015006
Journal	Journal of Astronomical Telescopes, Instruments, and Systems
Volume	6
Issue number	1
DOIs	https://doi.org/10.1117/1.JATIS.6.1.015006
State	Published - Jan 1 2020
Externally published	Yes

Keywords

Gemini Planet Imager
astrometric calibration
data processing
high-contrast imaging

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Control and Systems Engineering
Instrumentation
Astronomy and Astrophysics
Mechanical Engineering
Space and Planetary Science

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10.1117/1.JATIS.6.1.015006

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De Rosa, R. J., Nguyen, M. M., Chilcote, J., MacIntosh, B., Perrin, M. D., Konopacky, Q., Wang, J. J., Duchêne, G., Nielsen, E. L., Rameau, J., Ammons, S. M., Bailey, V. P., Barman, T., Bulger, J., Cotten, T., Doyon, R., Esposito, T. M., Fitzgerald, M. P., Follette, K. B., ... Wolff, S. (2020). Revised astrometric calibration of the Gemini Planet Imager. Journal of Astronomical Telescopes, Instruments, and Systems, 6(1), Article 015006. https://doi.org/10.1117/1.JATIS.6.1.015006

De Rosa, RJ, Nguyen, MM, Chilcote, J, MacIntosh, B, Perrin, MD, Konopacky, Q, Wang, JJ, Duchêne, G, Nielsen, EL, Rameau, J, Ammons, SM, Bailey, VP, Barman, T, Bulger, J, Cotten, T, Doyon, R, Esposito, TM, Fitzgerald, MP, Follette, KB, Gerard, BL, Goodsell, SJ, Graham, JR, Greenbaum, AZ, Hibon, P, Hung, LW, Ingraham, P, Kalas, P, Larkin, JE, Maire, J, Marchis, F, Marley, MS, Marois, C, Metchev, S, Millar-Blanchaer, MA, Oppenheimer, R, Palmer, D, Patience, J, Poyneer, L, Pueyo, L, Rajan, A, Rantakyrö, FT, Ruffio, JB, Savransky, D, Schneider, AC, Sivaramakrishnan, A, Song, I, Soummer, R, Thomas, S, Kent Wallace, J, Ward-Duong, K, Wiktorowicz, S & Wolff, S 2020, 'Revised astrometric calibration of the Gemini Planet Imager', Journal of Astronomical Telescopes, Instruments, and Systems, vol. 6, no. 1, 015006. https://doi.org/10.1117/1.JATIS.6.1.015006

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title = "Revised astrometric calibration of the Gemini Planet Imager",

abstract = "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.",

keywords = "Gemini Planet Imager, astrometric calibration, data processing, high-contrast imaging",

author = "{De Rosa}, {Robert J.} and Nguyen, {Meiji M.} and Jeffrey Chilcote and Bruce MacIntosh and Perrin, {Marshall D.} and Quinn Konopacky and Wang, {Jason J.} and Gaspard Duch{\^e}ne and Nielsen, {Eric L.} and Julien Rameau and Ammons, {S. Mark} and Bailey, {Vanessa P.} and Travis Barman and Joanna Bulger and Tara Cotten and Rene Doyon and Esposito, {Thomas M.} and Fitzgerald, {Michael P.} and Follette, {Katherine B.} and Gerard, {Benjamin L.} and Goodsell, {Stephen J.} and Graham, {James R.} and Greenbaum, {Alexandra Z.} and Pascale Hibon and Hung, {Li Wei} and Patrick Ingraham and Paul Kalas and Larkin, {James E.} and J{\'e}r{\^o}me Maire and Franck Marchis and Marley, {Mark S.} and Christian Marois and Stanimir Metchev and Millar-Blanchaer, {Maxwell A.} and Rebecca Oppenheimer and David Palmer and Jennifer Patience and Lisa Poyneer and Laurent Pueyo and Abhijith Rajan and Rantakyr{\"o}, {Fredrik T.} and Ruffio, {Jean Baptiste} and Dmitry Savransky and Schneider, {Adam C.} and Anand Sivaramakrishnan and Inseok Song and Remi Soummer and Sandrine Thomas and {Kent Wallace}, J. and Kimberly Ward-Duong and Sloane Wiktorowicz and Schuyler Wolff",

note = "Publisher Copyright: {\textcopyright} 2020 Society of Photo-Optical Instrumentation Engineers (SPIE).",

year = "2020",

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doi = "10.1117/1.JATIS.6.1.015006",

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journal = "Journal of Astronomical Telescopes, Instruments, and Systems",

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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

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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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 -

Revised astrometric calibration of the Gemini Planet Imager

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Keywords

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