Volume 440, Number 2, September III 2005
|Page(s)||L55 - L58|
|Published online||01 September 2005|
Letter to the Editor
The first wide ultracool binary dwarf in the field: DENIS-J055146.0-443412.2 (M8.5 + L0)
European Southern Observatory, Casilla 19001, Santiago 19, Chile e-mail: email@example.com
2 Laboratoire d'Astrophysique de Grenoble, Observatoire de Grenoble, BP 53, 38041 Grenoble, France
3 Canada-France-Hawaii Telescope Corporation, 65-1238 Mamaloha Highway, Kamuela, HI 96743, USA
4 Instituto de Astrofísica de Canarias, 38200 La Laguna, Spain
Accepted: 29 July 2005
We present observations of a new very low mass field binary, discovered during an infrared imaging survey of 250 DENIS L and very late-M dwarfs. DENIS-J055146.0-443412.2 is an M8.5 + L0 pair, with a physical separation of over 200 AU. This makes it the widest very low mass binary known in the field, by an order of magnitude. Such a system is fragile, and it would not have survived a close encounter with a third body. Its existence demonstrate that some very low mass stars/brown dwarfs form without ejection from a multiple system, or any other strong dynamical interaction.
Key words: stars / brown dwarfs / binary system / formation
© ESO, 2005
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