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Journal Articles The Astronomical Journal Year : 2020

HD 165054: An Astrometric Calibration Field for High-contrast Imagers in Baade's Window

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

Abstract

We present a study of the HD 165054 astrometric calibration field that has been periodically observed with the Gemini Planet Imager (GPI). HD 165054 is a bright star within Baade's Window, a region of the galactic plane with relatively low extinction from interstellar dust. HD 165054 was selected as a calibrator target due to the high number density of stars within this region (∼3 stars per square arcsecond with H < 22), necessary because of the small field of view of the GPI. Using nine epochs spanning over five years, we have fit a standard five-parameter astrometric model to the astrometry of seven background stars within close proximity to HD 165054 (ρ < 2″). We achieved a proper motion precision of ∼0.3 mas yr-1 and constrained the parallax of each star to be ≲1 mas. Our measured proper motions and parallax limits are consistent with the background stars being a part of the galactic bulge. Using these measurements, we find no evidence of any systematic trend of either the plate scale or the north angle offset of GPI between 2014 and 2019. We compared our model describing the motions of the seven background stars to observations of the same field in 2014 and 2018 obtained with Keck/NIRC2, an instrument with excellent astrometric calibration. We find that the predicted position of the background sources is consistent with that measured by NIRC2, within the uncertainties of the calibration of the two instruments. In the future, we will use this field as a standard astrometric calibrator for the upgrade of GPI and potentially for other high-contrast imagers.

Dates and versions

insu-03705160 , version 1 (27-06-2022)

Identifiers

Cite

Meiji M. Nguyen, Robert J. de Rosa, Jason J. Wang, Thomas M. Esposito, Paul Kalas, et al.. HD 165054: An Astrometric Calibration Field for High-contrast Imagers in Baade's Window. The Astronomical Journal, 2020, 159, ⟨10.3847/1538-3881/ab86aa⟩. ⟨insu-03705160⟩
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