Brown dwarfs or planets? . Some direct imaging detections that blur the border

We have been conducting an adaptive optic imaging survey to search for planetary-mass companions of young M dwarfs in the solar neigbourhood, in order to probe different initial conditions of planetary formation. We report here the direct-imaging discovery of 2MASS J01033563- 5515561(AB)b, a 12-14 M_Jup companion at a projected separation of 84 AU from a pair of young late-M stars, with which it shares proper motion. This young L-type object at the planet/brown dwarf mass boundary is the first ever imaged around a binary system at a separation compatible with formation in a disc.