The first wide ultracool binary dwarf in the field: DENIS-J055146.0-443412.2 (M8.5 + L0)

Preprint

4 August 2005

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0508130

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.

Keywords

PRESENT OBSERVATIONS
INFRARED IMAGING
DENIS J055146.0
WIDE ULTRACOOL
BINARY DWARF
J055146.0
DWARFS
M8.5

All Related Versions

Version 1, 2005-08-04, ArXiv
Published version: Astronomy & Astrophysics, 440 (2), L55.

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