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Microlensing Discovery of a Tight, Low Mass-ratio Planetary-mass Object around an Old, Field Brown Dwarf

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arxiv 1307.6335 v2 pith:VNJD4G3X submitted 2013-07-24 astro-ph.EP

Microlensing Discovery of a Tight, Low Mass-ratio Planetary-mass Object around an Old, Field Brown Dwarf

C. Han , Y. K. Jung , A. Udalski , T. Sumi , B. S. Gaudi , A. Gould , D. P. Bennett , Y. Tsapras
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M. K. Szyma\'nski M. Kubiak G. Pietrzy\'nski I. Soszy\'nski J. Skowron S. Koz{\l}owski R. Poleski K. Ulaczyk \L. Wyrzykowski P. Pietrukowicz F. Abe I. A. Bond C. S. Botzler P. Chote M. Freeman A. Fukui K. Furusawa P. Harris Y. Itow C. H. Ling K. Masuda Y. Matsubara Y. Muraki K. Ohnishi N. J. Rattenbury To. Saito D. J. Sullivan W. L. Sweatman D. Suzuki P. J. Tristram K. Wada P. C. M. Yock V. Batista G. Christie J.-Y. Choi D. L. DePoy Subo Dong K.-H. Hwang A. Kavka C.-U. Lee L. A. G. Monard T. Natusch H. Ngan H. Park R. W. Pogge I. Porritt I.-G. Shin T.G. Tan J. C. Yee K. A. Alsubai V. Bozza D. M. Bramich P. Browne M. Dominik K. Horne M. Hundertmark S. Ipatov N. Kains C. Liebig C. Snodgrass I. A. Steele R. A. Street
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keywords brownmassarounddwarfplanetary-massobjectrelativelyanalogous
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Observations of accretion disks around young brown dwarfs have led to the speculation that they may form planetary systems similar to normal stars. While there have been several detections of planetary-mass objects around brown dwarfs (2MASS 1207-3932 and 2MASS 0441-2301), these companions have relatively large mass ratios and projected separations, suggesting that they formed in a manner analogous to stellar binaries. We present the discovery of a planetary-mass object orbiting a field brown dwarf via gravitational microlensing, OGLE-2012-BLG-0358Lb. The system is a low secondary/primary mass ratio (0.080 +- 0.001), relatively tightly-separated (~0.87 AU) binary composed of a planetary-mass object with 1.9 +- 0.2 Jupiter masses orbiting a brown dwarf with a mass 0.022 M_Sun. The relatively small mass ratio and separation suggest that the companion may have formed in a protoplanetary disk around the brown dwarf host, in a manner analogous to planets.

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