OGLE-2016-BLG-0693LB: Probing the brown dwarf desert with microlensing (2017)
AuthorsRyu 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 Kshow all
Alternative TitleProbing the brown dwarf desert with microlensing
© 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.
Keywordsbinaries: general; brown dwarfs; gravitational lensing: micro
ANZSRC Fields of Research02 - 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