OGLE-2016-BLG-1469L: Microlensing Binary Composed of Brown Dwarfs

Han, C; Udalski, A; Sumi, T; Gould, A; Albrow, MD; Chung, S-J; Jung, YK; Ryu, Y-H; Shin, I-G; Yee, JC; Zhu, W; Cha, S-M; Kim, S-L; Kim, D-J; Lee, C-U; Lee, Y; Park, B-G; Soszyński, I; Mróz, P; Pietrukowicz, P; Szymański, MK; Skowron, J; Poleski, R; Kozłowski, S; Ulaczyk, K; Pawlak, M; Abe, F; Asakura, Y; Bennett, DP; Bond, IA; Bhattacharya, A; Donachie, M; Freeman, M; Fukui, A; Hirao, Y; Itow, Y; Koshimoto, N; Li, MCA; Ling, CH; Masuda, K; Matsubara, Y; Muraki, Y; Nagakane, M; Ohnishi, K; Oyokawa, H; Rattenbury, NJ; Saito, To; Sharan, A; Sullivan, DJ; Suzuki, D; Tristram, PJ; Yamada, T; Yamada, T; Yonehara, A; Barry, R

OGLE-2016-BLG-1469L: Microlensing Binary Composed of Brown Dwarfs

Han, C ; Udalski, A ; Sumi, T ; Gould, A ; Albrow, MD ; Chung, S-J ; Jung, YK ; Ryu, Y-H ; Shin, I-G ; Yee, JC ; Zhu, W ; Cha, S-M ; Kim, S-L ; Kim, D-J ; Lee, C-U ; Lee, Y ; Park, B-G ; Soszyński, I ; Mróz, P ; Pietrukowicz, P ; Szymański, MK ; Skowron, J ; Poleski, R ; Kozłowski, S ; Ulaczyk, K ; Pawlak, M ; Abe, F ; Asakura, Y ; Bennett, DP ; Bond, IA ; Bhattacharya, A ; Donachie, M ; Freeman, M ; Fukui, A ; Hirao, Y ; Itow, Y ; Koshimoto, N ; Li, MCA ; Ling, CH ; Masuda, K ; Matsubara, Y ; Muraki, Y ; Nagakane, M ; Ohnishi, K ; Oyokawa, H ; Rattenbury, NJ ; Saito, To ; Sharan, A ; Sullivan, DJ ; Suzuki, D ; Tristram, PJ ; Yamada, T ; Yamada, T ; Yonehara, A ; Barry, R

Identifier: https://hdl.handle.net/2292/63204

Issue Date: 2017-07-01

Reference: (2017). The Astrophysical Journal: an international review of astronomy and astronomical physics, 843(1), 59-.

Rights: Copyright: The authors

Rights (URI): https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm
Rights (URI): https://arxiv.org/licenses/nonexclusive-distrib/1.0/license.html

Abstract:

We report the discovery of a binary composed of two brown dwarfs, based on the analysis of the microlensing event OGLE-2016-BLG-1469. Thanks to the detection of both finite-source and microlens-parallax effects, we are able to measure both the masses M1 ∼ 0.05 M⊙ and M2 ∼ 0.01 M⊙, and the distance DL ∼ 4.5 kpc, as well as the projected separation a⊥ ∼ 0.33 au. This is the third brown-dwarf binary detected using the microlensing method, demonstrating the usefulness of microlensing in detecting field brown-dwarf binaries with separations of less than 1 au.

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