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Direct-imaging discovery of a 12-14 Jupiter-mass object orbiting a young binary system of very low-mass stars

Abstract : 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 MJup 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.

Based on observations obtained with NACO on VLT UT-4 at ESO-Paranal (runs 090.C-0698(A) and 70.D-0444(A).

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Submitted on : Wednesday, March 23, 2022 - 11:56:26 AM
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P. Delorme, J. Gagné, J. H. Girard, A. M. Lagrange, G. Chauvin, et al.. Direct-imaging discovery of a 12-14 Jupiter-mass object orbiting a young binary system of very low-mass stars. Astronomy and Astrophysics - A&A, EDP Sciences, 2013, 553, ⟨10.1051/0004-6361/201321169⟩. ⟨insu-03617077⟩

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