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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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posted on 2018-05-15, 13:54 authored by R. Poleski, A. Udalski, I. A. Bond, J. P. Beaulieu, C. Clanton, S. Gaudi, M. K. Szymański, I. Soszyński, P. Pietrukowicz, S. Kozłowski, J. Skowron, Wyrzykowski, K. Ulaczyk, D. P. Bennett, T. Sumi, D. Suzuki, N. J. Rattenbury, N. Koshimoto, F. Abe, Y. Asakura, R. K. Barry, A. Bhattacharya, M. Donachie, Philip Evans, A. Fukui, Y. Hirao, Y. Itow, M. C. A. Li, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, K. Ohnishi, C. Ranc, T. Saito, A. Sharan, D. J. Sullivan, P. J. Tristram, T. Yamada, A. Yonehara, V. Batista, J. B. Marquette
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 M Jup (M â- /0.5 M âŠ(tm) ). Thus, the companion is either a high-mass giant planet or a low-mass brown dwarf, depending on the mass of the primary M â- . 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 â- /0.5 M âŠ(tm) ) 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.

History

Citation

Astronomy and Astrophysics, 2017, 604 (A103)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Astronomy and Astrophysics

Publisher

EDP Sciences

issn

0004-6361

eissn

1432-0746

Copyright date

2017

Available date

2018-05-15

Publisher version

https://www.aanda.org/articles/aa/abs/2017/08/aa30928-17/aa30928-17.html

Language

en

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