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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2005

A companion to AB Pic at the planet/brown dwarf boundary

G. Chauvin
B. Zuckerman
  • Fonction : Auteur
C. Dumas
I. Song
  • Fonction : Auteur
J.-L. Beuzit
P. Lowrance
M. S. Bessell
  • Fonction : Auteur

Résumé

We report deep imaging observations of the young, nearby star AB Pic, a member of the large Tucana-Horologium association. We have detected a faint, red source 5.5'' South of the star with JHK colors compatible with that of a young substellar L dwarf. Follow-up observations at two additional epochs confirm, with a confidence level of 4.7σ, that the faint red object is a companion to AB Pic rather than it being a stationary background object. A low resolution K-band spectrum indicates an early-L spectral type for the companion. Finally, evolutionary model predictions based on the JHK photometry of AB Pic b indicate a mass of 13 to 14 MJup if its age is ~30 Myr. Is AB Pic b a massive planet or a minimum mass brown dwarf?

Dates et versions

hal-00398151 , version 1 (24-06-2009)

Identifiants

Citer

G. Chauvin, A.-M. Lagrange, B. Zuckerman, C. Dumas, D. Mouillet, et al.. A companion to AB Pic at the planet/brown dwarf boundary. Astronomy and Astrophysics - A&A, 2005, 438, pp.L29-L32. ⟨10.1051/0004-6361:200500111⟩. ⟨hal-00398151⟩
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