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Journal Articles The Astronomical Journal Year : 2017

Integral Field Spectroscopy of the Low-mass Companion HD 984 B with the Gemini Planet Imager

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Mara Johnson-Groh
  • Function : Author
Christian Marois
Robert J. de Rosa
  • Function : Author
Eric L. Nielsen
  • Function : Author
Julien Rameau
  • Function : Author
Sarah Blunt
  • Function : Author
Jeffrey Vargas
  • Function : Author
S. Mark Ammons
  • Function : Author
Vanessa P. Bailey
  • Function : Author
Travis S. Barman
  • Function : Author
Joanna Bulger
  • Function : Author
Jeffrey K. Chilcote
  • Function : Author
Tara Cotten
  • Function : Author
René Doyon
Michael P. Fitzgerald
  • Function : Author
Kate B. Follette
  • Function : Author
Stephen Goodsell
  • Function : Author
James R. Graham
  • Function : Author
Alexandra Z. Greenbaum
  • Function : Author
Pascale Hibon
  • Function : Author
Li-Wei Hung
  • Function : Author
Patrick Ingraham
  • Function : Author
Paul Kalas
Quinn M. Konopacky
  • Function : Author
James E. Larkin
  • Function : Author
Bruce Macintosh
Jérôme Maire
  • Function : Author
Franck Marchis
Mark S. Marley
  • Function : Author
Stanimir Metchev
  • Function : Author
Maxwell A. Millar-Blanchaer
  • Function : Author
Rebecca Oppenheimer
  • Function : Author
David W. Palmer
  • Function : Author
Jenny Patience
  • Function : Author
Marshall Perrin
Lisa A. Poyneer
  • Function : Author
Laurent Pueyo
  • Function : Author
Abhijith Rajan
  • Function : Author
Fredrik T. Rantakyrö
  • Function : Author
Dmitry Savransky
  • Function : Author
Adam C. Schneider
  • Function : Author
Anand Sivaramakrishnan
  • Function : Author
Inseok Song
  • Function : Author
Remi Soummer
  • Function : Author
Sandrine Thomas
  • Function : Author
David Vega
  • Function : Author
J. Kent Wallace
  • Function : Author
Jason J. Wang
  • Function : Author
Kimberly Ward-Duong
  • Function : Author
Sloane J. Wiktorowicz
  • Function : Author
Schuyler G. Wolff
  • Function : Author

Abstract

We present new observations of the low-mass companion to HD 984 taken with the Gemini Planet Imager (GPI) as a part of the GPI Exoplanet Survey campaign. Images of HD 984 B were obtained in the J (1.12-1.3 μm) and H (1.50-1.80 μm) bands. Combined with archival epochs from 2012 and 2014, we fit the first orbit to the companion to find an 18 au (70-year) orbit with a 68% confidence interval between 14 and 28 au, an eccentricity of 0.18 with a 68% confidence interval between 0.05 and 0.47, and an inclination of 119° with a 68% confidence interval between 114° and 125°. To address the considerable spectral covariance in both spectra, we present a method of splitting the spectra into low and high frequencies to analyze the spectral structure at different spatial frequencies with the proper spectral noise correlation. Using the split spectra, we compare them to known spectral types using field brown dwarf and low-mass star spectra and find a best-fit match of a field gravity M6.5 ± 1.5 spectral type with a corresponding temperature of {2730}-180+120 K. Photometry of the companion yields a luminosity of {log}({L}{bol}/{L})=-2.88+/- 0.07 dex with DUSTY models. Mass estimates, again from DUSTY models, find an age-dependent mass of 34 ± 1 to 95 ± 4 M Jup. These results are consistent with previous measurements of the object.

Dates and versions

insu-03692524 , version 1 (09-06-2022)

Identifiers

Cite

Mara Johnson-Groh, Christian Marois, Robert J. de Rosa, Eric L. Nielsen, Julien Rameau, et al.. Integral Field Spectroscopy of the Low-mass Companion HD 984 B with the Gemini Planet Imager. The Astronomical Journal, 2017, 153, ⟨10.3847/1538-3881/aa6480⟩. ⟨insu-03692524⟩
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