Journal
ASTRONOMY & ASTROPHYSICS
Volume 553, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321169
Keywords
planetary systems; stars: low-mass; methods: observational; instrumentation: adaptive optics
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Funding
- French National Research Agency (ANR) through the GuEPARD project [ANR10-BLANC0504-01]
- Programme National de Physique Stellaire (PNPS) of CNRS/INSU, France
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Context. Though only a handful of extrasolar planets have been discovered via direct-imaging, each of these discoveries had a tremendous impact on our understanding of planetary formation, stellar formation, and cool atmosphere physics. Aims. Since many of these newly imaged giant planets orbit massive A or even B stars, we investigate whether giant planets could be found orbiting low-mass stars at large separations. Methods. 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. Results. 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. We also detected a Keplerian-compatible orbital motion. Conclusions. 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.
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