OGLE-2016-BLG-0693LB: Probing the Brown Dwarf Desert with Microlensing
Y.-H. Ryu, A. Udalski, J. C. Yee, M. D. Albrow, S.-J. Chung, A. Gould,, C. Han, K.-H. Hwang, Y. K. Jung, I.-G. Shin, W. Zhu, S.-M. Cha, D.-J. Kim,, H.-W. Kim, S.-L. Kim, C.-U. Lee, Y. Lee, B.-G. Park, R. W. Pogge, P., Pietrukowicz, S. Kozlowski, R. Poleski, J. Skowron, P. Mroz
TL;DR
This paper analyzes a microlensing event to identify a low-mass brown dwarf companion in the Galactic bulge, providing insights into the brown dwarf desert with detailed modeling of the light curve.
Contribution
It presents the first microlensing detection of a brown dwarf in the brown dwarf desert, refining analysis with parallax, orbital motion, and Galactic model priors.
Findings
Identified a brown dwarf companion of 49±20 M_J
Located the system at 5.0±0.6 kpc in the Galactic bulge
Projected separation less than 5 AU, likely in the brown dwarf desert
Abstract
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.
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