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A companion on the planet/brown dwarf mass boundary on a wide orbit discovered by gravitational microlensing

Citation

Poleski, R and Udalski, A and Bond, IA and Beaulieu, J and Clanton, C and Gaudi, S and Szymanski, MK and Soszynski, I and Pietrukowicz, P and Kozlowski, S and Skowron, J and Wyrzykowski, A and Ulaczyk, K and Bennett, DP and Sumi, T and Suzuki, D and Rattenbury, NJ and Koshimoto, N and Abe, F and Asakura, Y and Barry, RK and Bhattacharya, A and Donachie, M and Evans, P and Fukui, A and Hirao, Y and Itow, Y and Li, MCA and Ling, CH and Masuda, K and Matsubara, Y and Muraki, Y and Nagakane, M and Ohnishi, K and Ranc, C and Saito, T and Sharan, A and Sullivan, DJ and Tristram, PJ and Yamada, T and Yamada, T and Yonehara, A and Batista, V and Marquette, JB, A companion on the planet/brown dwarf mass boundary on a wide orbit discovered by gravitational microlensing, Astronomy and Astrophysics, 604 Article A103. ISSN 0004-6361 (2017) [Refereed Article]


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Copyright ESO 2017

DOI: doi:10.1051/0004-6361/201730928

Abstract

We present the discovery of a substellar companion to the primary host lens in the microlensing event MOA-2012-BLG-006. The companion-to-host mass ratio is 0.016, corresponding to a companion mass of ≈8 MJup(M*/0.5 Mʘ). Thus, the companion is either a high-mass giant planet or a low-mass brown dwarf, depending on the mass of the primary M*. The companion signal was separated from the peak of the primary event by a time that was as much as four times longer than the event timescale. We therefore infer a relatively large projected separation of the companion from its host of ≈10 au(M*/0.5 Mʘ)1/2 for a wide range (3-7 kpc) of host star distances from the Earth. We also challenge a previous claim of a planetary companion to the lens star in microlensing event OGLE-2002-BLG-045.

Item Details

Item Type:Refereed Article
Keywords:gravitational lensing: micro, instrumentation: high angular resolution, planetary systems, brown dwarfs
Research Division:Mathematical Sciences
Research Group:Mathematical Physics
Research Field:Mathematical Physics not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
UTAS Author:Beaulieu, J (Dr Jean-Philippe Beaulieu)
ID Code:125264
Year Published:2017
Web of Science® Times Cited:2
Deposited By:Mathematics and Physics
Deposited On:2018-04-10
Last Modified:2018-08-16
Downloads:42 View Download Statistics

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