Journal
ASTRONOMY & ASTROPHYSICS
Volume 440, Issue 2, Pages L55-L58Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200500167
Keywords
stars; brown dwarfs; binary system; formation
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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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