e-Article
OGLE-2016-BLG-1469L: Microlensing Binary Composed of Brown Dwarfs
Document Type
Report
Author
Han, C; Udalski, A; Sumi, T; Gould, A; Albrow, M. D; Chung, S.-J; Jung, Y. K; Ryu, Y.-H; Shin, I.-G; Yee, J. C; 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, M. K; Skowron, J; Poleski, R; Kozłowski, S; Ulaczyk, K; Pawlak, M; Abe, F; Asakura, Y; Bennett, D. P; Bond, I. A; Bhattacharya, A; Donachie, M; Freeman, M; Fukui, A; Hirao, Y; Itow, Y; Koshimoto, N; Li, M. C. A; Ling, C. H; Masuda, K; Matsubara, Y; Muraki, Y; Nagakane, M; Ohnishi, K; Oyokawa, H; Rattenbury, N. J; Saito, To; Sharan, A; Sullivan, D. J; Suzuki, D; Tristram, P. J; Yamada, T; Yonehara, A; Barry, R
Source
The Astrophysical Journal. 843(1)
Subject
Language
English
ISSN
1538-4357
0004-637X
0004-637X
Abstract
We report the discovery of a binary composed of two brown dwarfs, based on the analysis of the micro lensing event OGLE-2016-BLG-1469. Thanks to the detection of both finite-source and micro lens-parallax effects, we are able to measure both the masses M(sub 1) ~ 0.05 Solar Mass and M(sub 2) ~ 0.01 Solar Mass, and the distance D(sub L) ~ 4.5 kpc, as well as the projected separation a(sub perpendicular) ~ 0.33 au. This is the third brown-dwarf binary detected using the micro lensing method, demonstrating the usefulness of micro lensing in detecting field brown-dwarf binaries with separations of less than 1 au.