Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey

Bibcode
2023A&A...675A..71H
DOI
10.1051/0004-6361/202245455
Han, Cheongho; Kil Jung, Youn; Kim, Doeon; Gould, Andrew; Bozza, Valerio; Bond, Ian A.; Chung, Sun-Ju; Albrow, Michael D.; Hwang, Kyu-Ha; Ryu, Yoon-Hyun; Shin, In-Gu; Shvartzvald, Yossi; Yang, Hongjing; Zang, Weicheng; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Chung-Uk; Lee, Dong-Joo; Yee, Jennifer C.; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W.; Abe, Fumio; Barry, Richard; Bennett, David P.; Bhattacharya, Aparna; Fujii, Hirosame; Fukui, Akihiko; Hirao, Yuki; Ishitani Silva, Stela; Kirikawa, Rintaro; Kondo, Iona; Koshimoto, Naoki; Matsubara, Yutaka; Matsumoto, Sho; Miyazaki, Shota; Muraki, Yasushi; Okamura, Arisa; Olmschenk, Greg; Ranc, Clément; Rattenbury, Nicholas J.; Satoh, Yuki; Sumi, Takahiro; Suzuki, Daisuke; Toda, Taiga; Tristram, Paul J.; Vandorou, Aikaterini; Yama, Hibiki; Itow, Yoshitaka
Bibliographical reference

Astronomy and Astrophysics

Advertised on:
7
2023
Journal
Astronomy and Astrophysics
Number of authors
51
IAC number of authors
1
Citations
2
Refereed citations
1
Description

Aims: We inspect the microlensing data of the KMTNet survey collected during the 2018-2020 seasons in order to find lensing events produced by binaries with brown dwarf (BD) companions.
Methods: In order to pick out binary-lens events with candidate BD lens companions, we conducted systematic analyses of all anomalous lensing events observed during the seasons from 2018 to 2020. By applying a selection criterion of mass ratio between the lens components of 0.03 ≲ q ≲ 0.1, we identify four binary-lens events with candidate BD companions, namely KMT-2018-BLG-0321, KMT-2018-BLG-0885, KMT-2019-BLG-0297, and KMT-2019-BLG-0335. For the individual events, we present interpretations of the lens systems and measure the observables that can be used to constrain the physical lens parameters.
Results: The masses of the lens companions estimated from the Bayesian analyses based on the measured observables indicate high probabilities that the lens companions are in the BD mass regime; that is, 59%, 68%, 66%, and 66% for the four respective events.
Type
Refereed
Gravitational lensing

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