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

View/ Open
Author
Han C
Udalski A
Sumi T
Gould A
Albrow MD
Chung SJ
Jung YK
Ryu YH
Shin IG
Yee JC
Zhu W
Cha SM
Kim SL
Kim DJ
Lee CU
Lee Y
Park BG
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 T
Sharan A
Sullivan DJ
Suzuki D
Tristram PJ
Yamada T
Yamada T
Yonehara A
Barry R
Date
2017Permanent Link
http://hdl.handle.net/10092/14948© 2017. The American Astronomical Society. All rights reserved. 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 ∼ 0.05 M⊙ and M 2 ∼ 0.01 M⊙, and the distance D L ∼ 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.