Remarks: 31 Aug. 06: The object could be a companion of SE 70 1700 AU away (Caballero et al 2006).
References:
CABALLERO J., MARTIN E., DOBBIE P. & BARRADO Y NAVASCUES D. , 2006
Are isolated planetary-mass objects really isolated? A brown dwarf-exoplanet system candidate in the sigma Orionis cluster
Astron. & Astrophys. ,
accepted preprint
ZAPATERO-OSORIO M., BEJAR V., MARTIN E., REBOLO R., BARRADO Y NAVASCUES D., BAILER-JONES C. & MUNDT R. , 2000
Discovery of Young, Isolated Planetary Mass Objects in the Orionis Star Cluster.
Science , 290 , 103 paper