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 M_J companion and a K- or G-dwarf host, which lies at a distance 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, and thus it is likely that the brown dwarf companion is located in the brown dwarf desert.
@article{arxiv.1707.01222,
title = {OGLE-2016-BLG-0693LB: Probing the Brown Dwarf Desert with Microlensing},
author = {Y. -H. Ryu and A. Udalski and J. C. Yee and M. D. Albrow and S. -J. Chung and A. Gould and C. Han and K. -H. Hwang and Y. K. Jung and I. -G. Shin and W. Zhu and S. -M. Cha and D. -J. Kim and H. -W. Kim and S. -L. Kim and C. -U. Lee and Y. Lee and B. -G. Park and R. W. Pogge and P. Pietrukowicz and S. Kozlowski and R. Poleski and J. Skowron and P. Mroz and M. K. Szymanski and I. Soszynski and M. Pawlak and K. Ulaczyk},
journal= {arXiv preprint arXiv:1707.01222},
year = {2017}
}
Comments
27 pages, 7 figures, 4 tables, Accepted for publication in AJ