The young, wide and very low mass visual binary Lambda Orionis 167

D. Barrado y Navascués, A. Bayo, M. Morales-Calderón, N. Huélamo, J. R. Stauffer, H. Bouy
2007 Astronomy and Astrophysics  
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
more » ... -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.
doi:10.1051/0004-6361:20077258 fatcat:n5usop5uv5bjnkaqplzeqf6m4y