OGLE-2016-BLG-0693LB: Probing the brown dwarf desert with microlensing

Ryu YH; Udalski A; Yee JC; Albrow MD; Chung SJ; Gould A; Han C; Hwang KH; Jung YK; Shin IG; Zhu W; Cha SM; Kim DJ; Kim HW; Kim SL; Lee CU; Lee Y; Park BG; Pogge RW; Pietrukowicz P; Kozłowski S; Poleski R; Skowron J; Mróz P; Szymański MK; Soszyński I; Pawlak M; Ulaczyk K

View/Open

Submitted version (3.768Mb)

Type of Content

Journal Article

UC Permalink

http://hdl.handle.net/10092/16270

DOI

https://doi.org/10.3847/1538-3881/aa8fd1

ISSN

0004-6256
1538-3881

Collections

Science: Journal Articles [952]

Authors

Ryu YH, Udalski A, Yee JC, Albrow MD, Chung SJ, Gould A, Han C, Hwang KH, Jung YK, Shin IG, Zhu W, Cha SM, Kim DJ, Kim HW, Kim SL, Lee CU, Lee Y, Park BG, Pogge RW, Pietrukowicz P, Kozłowski S, Poleski R, Skowron J, Mróz P, Szymański MK, Soszyński I, Pawlak M, Ulaczyk K

Alternative Title

Probing the brown dwarf desert with microlensing

Abstract

© 2017. The American Astronomical Society. All rights reserved. We present an analysis of microlensing event OGLE-2016-BLG-0693, based on the survey-only microlensing observations by the OGLE and KMTNet groups. In order to analyze the light curve, we consider the effects of parallax, orbital motion, and baseline slope, and also refine the result using a Galactic model prior. From the microlensing analysis, we find that the event is a binary composed of a low-mass brown dwarf (49+20-18MJ) companion and a K- or G-dwarf host, which lies at a distance of 5.0±0.6 kpc toward the Galactic bulge. The projected separation between the brown dwarf and its host star is less than .5 au, thus it is likely that the brown dwarf companion is located in the brown dwarf desert.

Keywords

binaries: general; brown dwarfs; gravitational lensing: micro

ANZSRC Fields of Research

02 - Physical Sciences::0201 - Astronomical and Space Sciences::020110 - Stellar Astronomy and Planetary Systems
02 - Physical Sciences::0201 - Astronomical and Space Sciences::020102 - Astronomical and Space Instrumentation