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

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

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摘要

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.

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  • 来源
    《The Astronomical journal》 |2020年第6期|244-1-244-14|共14页
  • 作者单位

    Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA;

    Institut de Recherche sur les Exoplanètes, Département de Physique, Université de Montréal, Montréal QC, H3C 3J7, Canada;

    Department of Astronomy, University of California, Berkeley, CA 94720, USADepartment of Physics & Astronomy, University of California, Los Angeles, CA 90095, USAPhysics and Astronomy Department, Amherst College, 21 Merrill Science Drive, Amherst, MA 01002, USAUniversity of Victoria, 3800 Finnerty Rd, Victoria, BC, V8P 5C2, CanadaGemini Observatory, 670 N. A'ohoku Place, Hilo, HI 96720, USADepartment of Astronomy, University of Michigan, Ann Arbor, MI 48109, USAEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileSchool of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Tempe, AZ 85287, USANatural Sounds and Night Skies Division, National Park Service, Fort Collins, CO 80525, USALarge Synoptic Survey Telescope, 950N Cherry Avenue, Tucson, AZ 85719, USACenter for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093, USADepartment of Astronomy, California Institute of Technology, Pasadena, CA 91125, USAKavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USALunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USAInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USADepartment of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 天文学;
  • 关键词

    165054; Calibration; High-contrast;

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