The young, wide and very low mass visual binary LOri167

Details The young, wide and very low mass visual binary LOri167 The young, wide and very low mass visual binary LOri167

2007-04-19

arxiv.org/abs/0704.2469v1

Astronomy and Astrophysics

Astrophysics

Astronomy & Astrophysics Letters, in press

Scientific paper

10.1051/0004-6361:20077258

We look for wide, faint companions around members of the 5 Myr Lambda Orionis open cluster. We used optical, near-infrared, and Spitzer/IRAC photometry. We report the discovery of a very wide very low mass visual binary, LOri167, formed by a brown dwarf and a planetary-mass candidate located at 5 arcsec, which seems to belong to the cluster. We derive Teff of 2125 and 1750 K. If they are members, comparisons with theoretical models indicate masses of 17 (20-15) Mjup and 8 (13-7) Mjup, with a projected separation of 2000 AU. Such a binary system would be difficult to explain in most models, particularly those where substellar objects form in the disks surrounding higher mass stars.

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