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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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Date
20/11/2013
Author
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, Paul
Dominik, M.
Horne, K.
Hundertmark, M.
Ipatov, S.
Kains, Noé
Liebig, C.
Snodgrass, C.
Steele, I. A.
Street, R. A.
Funder
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ST/K001515/1
ST/J001651/1
Keywords
Brown dwarfs
Gravitational lensing: micro
Planetary systems
QB Astronomy
QC Physics
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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.
Citation
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 , T , 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 , S , 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 & Street , R A 2013 , ' Microlensing discovery of a tight, low-mass-ratio planetary-mass object around an old field brown dwarf ' , Astrophysical Journal , vol. 778 , no. 1 , 38 . https://doi.org/10.1088/0004-637X/778/1/38
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.1088/0004-637X/778/1/38
ISSN
0004-637X
Type
Journal article
Rights
© 2013. The American Astronomical Society. All rights reserved.
Description
K.A., D.B., M.D., K.H., M.H., S.I., C.L., R.S., and Y.T. are supported by the NPRP grant NPRP-09-476-1-78 from the Qatar National Research Fund (a member of the Qatar Foundation). M.D. is a Royal Society University Research Fellow. K.H. is a Royal Society Leverhulme Trust Senior Research Fellow.
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5490

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