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Characterizing brown dwarf companions with IRDIS long-slit spectroscopy: HD 1160 B and HD 19467 B

  • Mesa, D INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
  • D’Orazi, V School of Physics and Astronomy, Monash University, Clayton Campus, Victoria 3800, Melbourne, Australia
  • Vigan, A Aix Marseille Université, CNRS, LAM, UMR 7326, F-13388, Marseille, France
  • Kitzmann, D ORCID Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, CH-3012 Bern, Switzerland
  • Heng, K Department of Physics, Astronomy & Astrophysics Group, University of Warwick, Coventry CV4 7AL, UK
  • Gratton, R INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
  • Desidera, S INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
  • Bonnefoy, M Univ. Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
  • Lavie, B Geneva Observatory, University of Geneva, Chemin des Maillettes 51, CH-1290 Versoix, Switzerland
  • Maire, A-L STAR Institute, Université de Liège, Allée du Six Août 19c, B-4000 Liège, Belgium
  • Peretti, S Geneva Observatory, University of Geneva, Chemin des Maillettes 51, CH-1290 Versoix, Switzerland
  • Boccaletti, A LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France
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  • 2020-5-23
Published in:
  • Monthly Notices of the Royal Astronomical Society. - Oxford University Press (OUP). - 2020, vol. 495, no. 4, p. 4279-4290
Space and Planetary Science
Astronomy and Astrophysics
English ABSTRACT
The determination of the fundamental properties (mass, separation, age, gravity, and atmospheric properties) of brown dwarf companions allows us to infer crucial informations on their formation and evolution mechanisms. Spectroscopy of substellar companions is available to date only for a limited number of objects (and mostly at very low resolution, R < 50) because of technical limitations, i.e. contrast and angular resolution. We present medium resolution (R = 350), coronagraphic long-slit spectroscopic observations with SPHERE of two substellar companions, HD 1160 B and HD 19467 B. We found that HD 1160 B has a peculiar spectrum that cannot be fitted by spectra in current spectral libraries. A good fit is possible only considering separately the Y+J and the H spectral band. The spectral type is between M5 and M7. We also estimated a Teff of 2800–2900 K and a log g of 3.5–4.0 dex. The low surface gravity seems to favour young age (10–20 Myr) and low mass (∼20 MJup ) for this object. HD 19467 B is instead a fully evolved object with a Teff of ∼1000 K and log g of ∼5.0 dex. Its spectral type is T6 ± 1.
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  • English
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green
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https://sonar.ch/global/documents/425
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