Bibcode
Chung, Sun-Ju; Gould, Andrew; Skowron, Jan; Bond, Ian A.; Zhu, Wei; Albrow, Michael D.; Jung, Youn Kil; Han, Cheongho; Hwang, Kyu-Ha; Ryu, Yoon-Hyun; Shin, In-Gu; Shvartzvald, Yossi; Yee, Jennifer C.; Zang, Weicheng; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Kim, Yun-Hak; Lee, Chung-Uk; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W.; The KMTNet collaboration; Udalski, Andrzej; Poleski, Radek; Mróz, Przemek; Pietrukowicz, Paweł; Szymański, Michał K.; Soszyński, Igor; Kozłowski, Szymon; Ulaczyk, Krzysztof; Pawlak, Michał; The OGLE collaboration; Beichman, Charles A.; Bryden, Geoffery; Calchi Novati, Sebastiano; Carey, Sean; Gaudi, B. Scott; Henderson, Calen B.; The Spitzer team; Abe, Fumio; Barry, Richard; Bennett, David P.; Bhattacharya, Aparna; Donachie, Martin; Fukui, Akihiko; Hirao, Yuki; Itow, Yoshitaka; Kawasaki, Kohei; Kondo, Iona; Koshimoto, Naoki; Li, Man Cheung Alex; Matsubara, Yutaka; Muraki, Yasushi; Miyazaki, Shota; Nagakane, Masayuki; Ranc, Clément; Rattenbury, Nicholas J.; Suematsu, Haruno; Sullivan, Denis J.; Sumi, Takahiro; Suzuki, Daisuke; Tristram, Paul J.; Yonehara, Atsunori; MOA colllaboration, The
Bibliographical reference
The Astrophysical Journal, Volume 871, Issue 2, article id. 179, 13 pp. (2019).
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2
2019
Journal
Citations
11
Refereed citations
9
Description
We analyze the binary microlensing event MOA-2016-BLG-231, which was
observed from the ground and from Spitzer. The lens is composed of
very-low-mass brown dwarfs (BDs) with
{M}1={21}-5+12 {M}J and
{M}2={9}-2+5 {M}J, and it is
located in the Galactic disk
{D}{{L}}={2.85}-0.50+0.88 {kpc}. This
is the fifth binary brown dwarf discovered by microlensing, and the BD
binary is moving counter to the orbital motion of disk stars.
Constraints on the lens physical properties come from late-time,
non-caustic-crossing features of the Spitzer light curve. Thus,
MOA-2016-BLG-231 shows how Spitzer plays a crucial role in resolving the
nature of BDs in binary BD events with short timescales (≲10 days).