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Title:
The first wide ultracool binary dwarf in the field: DENIS-J055146.0-443412.2 (M8.5 + L0)
Authors:
Billères, M.; Delfosse, X.; Beuzit, J.-L.; Forveille, T.; Marchal, L.; Martín, E. L.
Affiliation:
AA(European Southern Observatory, Casilla 19001, Santiago 19, Chile ), AB(Laboratoire d'Astrophysique de Grenoble, Observatoire de Grenoble, BP 53, 38041 Grenoble, France), AC(Laboratoire d'Astrophysique de Grenoble, Observatoire de Grenoble, BP 53, 38041 Grenoble, France), AD(Canada-France-Hawaii Telescope Corporation, 65-1238 Mamaloha Highway, Kamuela, HI 96743, USA ; Laboratoire d'Astrophysique de Grenoble, Observatoire de Grenoble, BP 53, 38041 Grenoble, France), AE(Laboratoire d'Astrophysique de Grenoble, Observatoire de Grenoble, BP 53, 38041 Grenoble, France), AF(Instituto de Astrofísica de Canarias, 38200 La Laguna, Spain)
Publication:
Astronomy and Astrophysics, Volume 440, Issue 2, September III 2005, pp.L55-L58 (A&A Homepage)
Publication Date:
09/2005
Origin:
EDP Sciences
Keywords:
stars, brown dwarfs, binary system, formation
DOI:
10.1051/0004-6361:200500167
Bibliographic Code:
2005A&A...440L..55B

Abstract

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.
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