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Paper detail

The young, wide and very low mass visual binary LOri167

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.

preprint2007arXivOpen access
D. Barrado y NavascuesA. BayoM. Morales-CalderonN. HuelamoJ. R. StaufferH. Bouy
astro-ph
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D. Barrado y NavascuesA. BayoM. Morales-CalderonN. HuelamoJ. R. StaufferH. Bouy

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