Brown-dwarf companions in microlensing binaries detected during the 2016--2018 seasons
Abstract
With the aim of finding microlensing binaries containing brown-dwarf (BD) companions, we investigate the microlensing survey data collected during the 2016--2018 seasons. For this purpose, we first conducted modeling of lensing events with light curves exhibiting anomaly features that are likely to be produced by binary lenses. We then sorted out BD-companion binary-lens events by applying the criterion that the companion-to-primary mass ratio is . From this procedure, we identify 6 binaries with candidate BD companions, including OGLE-2016-BLG-0890L, MOA-2017-BLG-477L, OGLE-2017-BLG-0614L, KMT-2018-BLG-0357L, OGLE-2018-BLG-1489L, and OGLE-2018-BLG-0360L. We estimate the masses of the binary companions by conducting Bayesian analyses using the observables of the individual lensing events. According to the Bayesian estimation of the lens masses, the probabilities for the lens companions of the events OGLE-2016-BLG-0890, OGLE-2017-BLG-0614, OGLE-2018-BLG-1489, and OGLE-2018-BLG-0360 to be in the BD mass regime are very high with . For MOA-2017-BLG-477 and KMT-2018-BLG-0357, the probabilities are relatively low with and 69\%, respectively.
Cite
@article{arxiv.2209.04607,
title = {Brown-dwarf companions in microlensing binaries detected during the 2016--2018 seasons},
author = {Cheongho Han and Yoon-Hyun Ryu and In-Gu Shin and Youn Kil Jung and Doeon Kim and Yuki Hirao and Valerio Bozza and Michael D. Albrow and Weicheng Zang and Andrzej Udalski and Ian A. Bond and Sun-Ju Chung and Andrew Gould and Kyu-Ha Hwang and Yossi Shvartzvald and Hongjing Yang and Sang-Mok Cha and Dong-Jin Kim and Hyoun-Woo Kim and Seung-Lee Kim and Chung-Uk Lee and Dong-Joo Lee and Jennifer C. Yee and Yongseok Lee and Byeong-Gon Park and Richard W. Pogge and Przemek Mróz and Michał K. Szymański and Jan Skowron and Radek Poleski and Igor Soszyński and Paweł Pietrukowicz and Szymon Kozłowski and Krzysztof Ulaczyk and Krzysztof A. Rybicki and Patryk Iwanek and Marcin Wrona and Fumio Abe and Richard Barry and David P. Bennett and Aparna Bhattacharya and Hirosame Fujii and Akihiko Fukui and Stela Ishitani Silva and Rintaro Kirikawa and Iona Kondo and Naoki Koshimoto and Yutaka Matsubara and Sho Matsumoto and Shota Miyazaki and Yasushi Muraki and Arisa Okamura and Greg Olmschenk and Clément Ranc and Nicholas J. Rattenbury and Yuki Satoh and Takahiro Sumi and Daisuke Suzuki and Taiga Toda and Paul J. Tristram and Aikaterini Vandorou and Hibiki Yama and Yoshitaka Itow},
journal= {arXiv preprint arXiv:2209.04607},
year = {2022}
}
Comments
11 pages, 10 figures, 10 tables