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

作者：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; Soszynski I; Mroz P; Pietrukowicz P; Szymanski M K; Skowron J; Poleski R; Kozlowski 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

来源：Astrophysical Journal, 2017, 843(1): 59.

DOI：10.3847/1538-4357/aa740e

• binaries: general
• brown dwarfs
• gravitational lensing: micro

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 M-1 similar to 0.05M(circle dot) and. M-2 similar to 0.01M(circle dot), and the. distance D-L similar to 4.5 kpc, as well as the projected separation a(perpendicular to) similar to 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.

• 出版日期2017-7-1
• 单位中国科学院国家天文台