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

  title={The young, wide and very low mass visual binary Lambda Orionis 167},
  author={David Barrado y Navascu{\'e}s and Amelia Bayo and M. Morales-Calder{\'o}n and Nuria Huelamo and John R. Stauffer and Herv{\'e} Bouy},
  journal={Astronomy and Astrophysics},
Aims. We look for wide, faint companions around members of the 5 Myr Lambda Orionis open cluster. Methods. We used optical, near-infrared, and Spitzer/IRAC photometry. Results. 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 T eff of 2125 and 1750 K. If they are members, comparisons with theoretical models indicate masses of 17 +3 -2 and 8 +5… 

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