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MOA-2015-BLG-337: A Planetary System with a Low-mass Brown Dwarf/Planetary Boundary Host, or a Brown Dwarf Binary

MPS-Authors

Miyazaki,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sumi,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bennett,  D. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gould,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Udalski,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bond,  I. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Koshimoto,  N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nagakane,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rattenbury,  N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Abe,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bhattacharya,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Barry,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Donachie,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fukui,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hirao,  Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Itow,  Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kawasaki,  K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Li,  M. C. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ling,  C. H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Matsubara,  Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Matsuo,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Muraki,  Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ohnishi,  K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ranc,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Saito,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sharan,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shibai,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suematsu,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suzuki,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sullivan,  D. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tristram,  P. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yamada,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yonehara,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration,  MOA
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

KozŁowski,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mróz,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pawlak,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Poleski,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pietrukowicz,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skowron,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Soszyński,  I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Szymański,  M. K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ulaczyk,  K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration,  OGLE
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Albrow,  M. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chung,  S. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Han,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jung,  Y. K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hwang,  K. -H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ryu,  Y. -H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shin,  I. -G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shvartzvald,  Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yee,  J. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zang,  W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhu,  W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cha,  S. -M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  D. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  H. -W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  S. -L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  C. -U.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  D. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Park,  B. -G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pogge,  R. W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration,  KMTNet
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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Citation

Miyazaki, S., Sumi, T., Bennett, D. P., Gould, A., Udalski, A., Bond, I. A., et al. (2018). MOA-2015-BLG-337: A Planetary System with a Low-mass Brown Dwarf/Planetary Boundary Host, or a Brown Dwarf Binary. The Astronomical Journal, 156.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CC22-F
Abstract
We report on the discovery and analysis of the short-timescale binary- lens microlensing event, MOA-2015-BLG-337. The lens system could be a planetary system with a very low-mass host, around the brown dwarf (BD )/planetary-mass boundary, or a BD binary. We found two competing models that explain the observed light curves with companion/host mass ratios of q ̃ 0.01 and ̃0.17, respectively. A significant finite source effect in the best-fit planetary model (q ̃ 0.01) reveals a small angular Einstein radius of θ E ≃ 0.03 mas, which favors a low-mass lens. We obtain the posterior probability distribution of the lens properties from a Bayesian analysis. The results for the planetary models strongly depend on a power-law index in planetary-mass regime, α pl, in the assumed mass function. In summary, there are two solutions of the lens system: (1) a BD/planetary-mass boundary object orbited by a super-Neptune (the planetary model with α pl = 0.49) and (2) a BD binary (the binary model). If the planetary models are correct, this system can be one of a new class of planetary system, having a low host mass and also a planetary-mass ratio (q < 0.03) between the companion and its host. The discovery of the event is important for the study of planetary formation in very low-mass objects. In addition, it is important to consider all viable solutions in these kinds of ambiguous events in order for the future comprehensive statistical analyses of planetary/binary microlensing events.