Volume 460, Number 2, December III 2006
|Page(s)||L19 - L22|
|Published online||16 October 2006|
Letter to the Editor
Five new very low mass binaries
Laboratoire d'Astrophysique de Grenoble, BP 53, 38041 Grenoble Cedex, France e-mail: Guillaume.Montagnier@obs.ujf-grenoble.fr
2 Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
3 Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Highway, Kamuela, HI 96743, Hawaii, USA
4 European Southern Observatory, Casilla 19001, Santiago 19, Chile
5 Laboratoire d'Astrophysique de Toulouse et Tarbes, BP 826, 65008 Tarbes Cedex, France
6 ONERA-DOTA, BP 72, 29 avenue de la Division Leclerc, 92322 Châtillon Cedex, France
7 Laboratoire d'Études Spatiales et d'Instrumentation Astrophysique, 92195 Meudon Cedex, France
Accepted: 12 October 2006
We report the discovery of companions to 5 nearby late M dwarfs (>M5), LHS1901, LHS4009, LHS6167, LP869-26 and WT460, and we confirm that the recently discovered mid-T brown dwarf companion to SCR1845-6357 is physically bound to that star. These discoveries result from our adaptive optics survey of all M dwarfs within 12 pc. The new companions have spectral types M5 to L1, and orbital separations between 1 and 10 AU. They add significantly to the number of late M dwarfs binaries in the immediate solar neighbourhood, and will improve the multiplicity statistics of late M dwarfs. The expected periods range from 3 to 130 years. Several pairs thus have good potential for accurate mass determination in this poorly sampled mass range.
Key words: binaries: visual / stars: low-mass, brown dwarfs / techniques: high angular resolution / instrumentation: adaptive optics
© ESO, 2006
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