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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2010

A brown dwarf companion to the intermediate-mass star HR 6037

N. Huélamo
  • Fonction : Auteur
D. E. A. Nürnberger
  • Fonction : Auteur
V. D. Ivanov
  • Fonction : Auteur
G. Chauvin
G. Carraro
  • Fonction : Auteur
M. F. Sterzik
  • Fonction : Auteur
C. H. F. Melo
  • Fonction : Auteur
M. Bonnefoy
M. Hartung
  • Fonction : Auteur
X. Haubois
  • Fonction : Auteur

Résumé

Context. The frequency of brown dwarf and planetary-mass companions around intermediate-mass stars is still unknown. Imaging and radial velocity surveys have revealed a small number of substellar companions to these stars. Aims. In the course of an imaging survey we detected a visual companion to the intermediate-mass star HR 6037. We here confirm it as a co-moving substellar object. Methods. We present two epoch observations of HR 6037, an A6-type star with a companion candidate at 6 ''.67 and position angle of 294 degrees. We also analyze near-infrared spectroscopy of the companion. Results. Two epoch observations of HR 6037 have allowed us to confirm HR 6037 B as a co-moving companion. Its J and H band spectra suggest that the object has a spectral type of M9, with a surface gravity that is intermediate between a 10 Myr dwarf and a field dwarf of the same spectral type. The comparison of its K-s-band photometry with evolutionary tracks allows us to derive a mass, effective temperature, and surface gravity of 62 +/- 20 M-Jup, T-eff = 2330 +/- 200 K, and log g = 5.1 +/- 0.2, respectively. The low binary mass ratio, q similar to 0.03, and its long orbital period, similar to 5000 yr, make HR 6037 a rare and uncommon binary system.

Dates et versions

hal-00631968 , version 1 (13-10-2011)

Identifiants

Citer

N. Huélamo, D. E. A. Nürnberger, V. D. Ivanov, G. Chauvin, G. Carraro, et al.. A brown dwarf companion to the intermediate-mass star HR 6037. Astronomy and Astrophysics - A&A, 2010, 521, pp.L54. ⟨10.1051/0004-6361/201015708⟩. ⟨hal-00631968⟩
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