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

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:

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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:
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Copyright ESO 2017

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