Brown dwarf companions in microlensing binaries detected during the 2016-2018 seasons

Bibcode
2022A&A...667A..64H
DOI
10.1051/0004-6361/202244186
Han, Cheongho; Ryu, Yoon-Hyun; Shin, In-Gu; Kil Jung, Youn; Kim, Doeon; Hirao, Yuki; Bozza, Valerio; Albrow, Michael D.; Zang, Weicheng; Udalski, Andrzej; Bond, Ian A.; Chung, Sun-Ju; Gould, Andrew; Hwang, Kyu-Ha; Shvartzvald, Yossi; Yang, Hongjing; 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.; Mróz, Przemek; Szymański, Michał K.; Skowron, Jan; Poleski, Radek; Soszyński, Igor; Pietrukowicz, Paweł; Kozłowski, Szymon; Ulaczyk, Krzysztof; Rybicki, Krzysztof A.; Iwanek, Patryk; Wrona, Marcin; Abe, Fumio; Barry, Richard; Bennett, David P.; Bhattacharya, Aparna; Fujii, Hirosame; Fukui, Akihiko; 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
Referencia bibliográfica

Astronomy and Astrophysics

Fecha de publicación:
11
2022
Revista
Astronomy and Astrophysics
Número de autores
63
Número de autores del IAC
1
Número de citas
7
Número de citas referidas
7
Descripción

Aims: With the aim of finding microlensing binaries containing brown dwarf (BD) companions, we investigate the microlensing survey data collected during the 2016-2018 seasons.
Methods: For this purpose, we first modeled 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 q ≲ 0.1. With this procedure, we identify six binaries with candidate BD companions: 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.
Results: We estimated 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 PBD > 80%. For MOA-2017-BLG-477 and KMT-2018-BLG-0357, the probabilities are relatively low with PBD = 61% and 69%, respectively.
Proyectos relacionados
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Exoplanetas y Astrobiología
La búsqueda de vida en el Universo se ha visto impulsada por los recientes descubrimientos de planetas alrededor de otras estrellas (los llamados exoplanetas), convirtiéndose en uno de los campos más activos dentro de la Astrofísica moderna. En los últimos años los descubrimientos cada vez más numerosos de nuevos exoplanetas y los últimos avances
Enric
Pallé Bago
En ejecución
Tipo
Con árbitro
Sistema Solar y Sistemas Planetarios (SEYSS)
Lente gravitacional

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