2016—2018观测季微引力透镜双星中发现的棕矮星伴星
太阳与恒星天体物理
2022-11-16 v1 地球与行星天体物理
星系天体物理
摘要
为寻找含有棕矮星(BD)伴星的微引力透镜双星，我们研究了2016—2018观测季收集的微引力透镜巡天数据。为此，我们首先对具有可能由双星透镜产生的反常特征光变的透镜事件进行建模。然后，通过应用伴星与主星质量比 的判据，筛选出BD伴星双星透镜事件。通过此过程，我们识别出6个具有BD伴星候选的双星，包括OGLE-2016-BLG-0890L、MOA-2017-BLG-477L、OGLE-2017-BLG-0614L、KMT-2018-BLG-0357L、OGLE-2018-BLG-1489L和OGLE-2018-BLG-0360L。我们利用各透镜事件的可观测量进行贝叶斯分析来估计双星伴星的质量。根据透镜质量的贝叶斯估计，事件OGLE-2016-BLG-0890、OGLE-2017-BLG-0614、OGLE-2018-BLG-1489和OGLE-2018-BLG-0360的透镜伴星处于BD质量区间的概率非常高，均有 。对于MOA-2017-BLG-477和KMT-2018-BLG-0357，概率相对较低，分别为 和69\%。
引用
@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}
}
备注
11 pages, 10 figures, 10 tables