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

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Author
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
Date
2017
Permanent Link
http://hdl.handle.net/10092/16270

© 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.

Subjects
binaries: general
 
brown dwarfs
 
gravitational lensing: micro
 
Field of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020110 - Stellar Astronomy and Planetary Systems
 
Field of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020102 - Astronomical and Space Instrumentation
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