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Journal Articles The Astronomical Journal Year : 2022

SCExAO and Keck Direct Imaging Discovery of a Low-mass Companion Around the Accelerating F5 Star HIP 5319

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Noah Swimmer
  • Function : Author
Thayne Currie
  • Function : Author
Sarah Steiger
  • Function : Author
G. Mirek Brandt
  • Function : Author
Timothy D. Brandt
  • Function : Author
Olivier Guyon
  • Function : Author
Masayuki Kuzuhara
  • Function : Author
Jeffrey Chilcote
  • Function : Author
Taylor Tobin
  • Function : Author
Tyler D. Groff
  • Function : Author
Julien Lozi
  • Function : Author
John I. Bailey
  • Function : Author
Alexander B. Walter
  • Function : Author
Neelay Fruitwala
  • Function : Author
Nicholas Zobrist
  • Function : Author
Jennifer Pearl Smith
  • Function : Author
Gregoire Coiffard
  • Function : Author
Rupert Dodkins
  • Function : Author
Kristina K. Davis
  • Function : Author
Miguel Daal
  • Function : Author
Bruce Bumble
  • Function : Author
Sebastien Vievard
  • Function : Author
Vincent Deo
  • Function : Author
Nemanja Jovanovic
  • Function : Author
Motohide Tamura
  • Function : Author
N. Jeremy Kasdin
  • Function : Author
Benjamin A. Mazin
  • Function : Author

Abstract

We present the direct imaging discovery of a low-mass companion to the nearby accelerating F star, HIP 5319, using SCExAO coupled with the CHARIS, VAMPIRES, and MEC instruments in addition to Keck/NIRC2 imaging. CHARIS JHK (1.1-2.4 μm) spectroscopic data combined with VAMPIRES 750 nm, MEC Y, and NIRC2 L p photometry is best matched by an M3-M7 object with an effective temperature of T = 3200 K and surface gravity log(g) = 5.5. Using the relative astrometry for HIP 5319 B from CHARIS and NIRC2, and absolute astrometry for the primary from Gaia and Hipparcos, and adopting a log-normal prior assumption for the companion mass, we measure a dynamical mass for HIP 5319 B of ${31}_{-11}^{+35}{M}_{{\rm{J}}}$ , a semimajor axis of ${18.6}_{-4.1}^{+10}$ au, an inclination of ${69.4}_{-15}^{+5.6}$ degrees, and an eccentricity of ${0.42}_{-0.29}^{+0.39}$ . However, using an alternate prior for our dynamical model yields a much higher mass of ${128}_{-88}^{+127}{M}_{{\rm{J}}}$ . Using data taken with the LCOGT NRES instrument we also show that the primary HIP 5319 A is a single star in contrast to previous characterizations of the system as a spectroscopic binary. This work underscores the importance of assumed priors in dynamical models for companions detected with imaging and astrometry, and the need to have an updated inventory of system measurements. *Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. This work makes use of observations from the Las Cumbres Observatory global telescope network (LCOGT).
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Dates and versions

insu-03874882 , version 1 (28-11-2022)

Licence

Attribution - CC BY 4.0

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Noah Swimmer, Thayne Currie, Sarah Steiger, G. Mirek Brandt, Timothy D. Brandt, et al.. SCExAO and Keck Direct Imaging Discovery of a Low-mass Companion Around the Accelerating F5 Star HIP 5319. The Astronomical Journal, 2022, 164, ⟨10.3847/1538-3881/ac85a8⟩. ⟨insu-03874882⟩
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