2017/07/31 by Yoon-Hyun Ryu, Y. -H. Ryu, A. Udalski +47 · 1 citation
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Brown dwarf #Gravitational microlensing #Physics #Stars #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.3847/1538-3881/aa8fd1
27 pages, 7 figures, 4 tables, Accepted for publication in AJ
arxiv created 2017/09/27 · openalex publication_date 2017/11/21 · arxiv updated 2017/12/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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 ( ) 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.