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Microlensing discovery of a tight, low-mass-ratio planetary-mass object around an old field brown dwarf

Han, C.; Jung, Y. K.; Udalski, A.; Sumi, T.; Gaudi, B. S.; Gould, A.; Bennett, D. P.; Tsapras, Y.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Soszyński, I.; Skowron, J.; Kozłowski, S.; Poleski, R.; Ulaczyk, K.; Wyrzykowski, Ł.; Pietrukowicz, P.; Abe, F.; Bond, I. A.; Botzler, C. S.; Chote, P.; Freeman, M.; Fukui, A.; Furusawa, K.; Harris, P.; Itow, Y.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Muraki, Y.; Ohnishi, K.; Rattenbury, N. J.; Saito, To.; Sullivan, D. J.; Sweatman, W. L.; Suzuki, D.; Tristram, P. J.; Wada, K.; Yock, P. C. M.; Batista, V.; Christie, G.; Choi, J.-Y.; DePoy, D. L.; Dong, Subo; Hwang, K.-H.; Kavka, A.; Lee, C.-U.; Monard, L. A. G.; Natusch, T.; Ngan, H.; Park, H.; Pogge, R. W.; Porritt, I.; Shin, I.-G.; Tan, T.G.; Yee, J. C.; Alsubai, K. A.; Bozza, V.; Bramich, D. M.; Browne, P.; Dominik, M.; Horne, K.; Hundertmark, M.; Ipatov, S.; Kains, N.; Liebig, C.; Snodgrass, C.; Steele, I. A. and Street, R. A. (2013). Microlensing discovery of a tight, low-mass-ratio planetary-mass object around an old field brown dwarf. Astrophysical Journal, 778(1), article no. 38.

DOI (Digital Object Identifier) Link: https://doi.org/10.1088/0004-637X/778/1/38
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Abstract

Observations of accretion disks around young brown dwarfs (BDs) 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 BDs (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 BD 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 BD with a mass 0.022 M. The relatively small mass ratio and separation suggest that the companion may have formed in a protoplanetary disk around the BD host in a manner analogous to planets.

Item Type: Journal Item
Copyright Holders: 2013 The American Astronomical Society
ISSN: 1538-4357
Extra Information: 6 pp.
Keywords: brown dwarfs; gravitational lensing; planetary systems
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 43038
Depositing User: Colin Snodgrass
Date Deposited: 21 May 2015 09:24
Last Modified: 07 Dec 2018 10:31
URI: http://oro.open.ac.uk/id/eprint/43038
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