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

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Poleski, R, Udalski, A, Bond, IA, Beaulieu, J, Clanton, C, Gaudi, S, Szymanski, MK, Soszynski, I, Pietrukowicz, P, Kozlowski, S, Skowron, J, Wyrzykowski, A, Ulaczyk, K, Bennett, DP, Sumi, T, Suzuki, D, Rattenbury, NJ, Koshimoto, N, Abe, F, Asakura, Y, Barry, RK, Bhattacharya, A, Donachie, M, Evans, P, Fukui, A, Hirao, Y, Itow, Y, Li, MCA, Ling, CH, Masuda, K, Matsubara, Y, Muraki, Y, Nagakane, M, Ohnishi, K, Ranc, C, Saito, T, Sharan, A, Sullivan, DJ, Tristram, PJ, Yamada, T, Yamada, T, Yonehara, A, Batista, V and Marquette, JB 2017 , 'A companion on the planet/brown dwarf mass boundary on a wide orbit discovered by gravitational microlensing' , Astronomy and Astrophysics, vol. 604 , pp. 1-8 , doi: 10.1051/0004-6361/201730928.

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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 Type: Article
Authors/Creators: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
Keywords: gravitational lensing: micro, instrumentation: high angular resolution, planetary systems, brown dwarfs
Journal or Publication Title: Astronomy and Astrophysics
Publisher: EDP Science
ISSN: 0004-6361
DOI / ID Number: 10.1051/0004-6361/201730928
Copyright Information:

Copyright ESO 2017

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