OGLE-2018-BLG-0971, MOA-2023-BLG-065, and OGLE-2023-BLG-0136: Microlensing events with prominent orbital effects
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Published:2024-06
Issue:
Volume:686
Page:A234
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ISSN:0004-6361
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Container-title:Astronomy & Astrophysics
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language:
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Short-container-title:A&A
Author:
Han Cheongho, Udalski Andrzej, Bond Ian A.ORCID, Lee Chung-UkORCID, Gould Andrew, Albrow Michael D., Chung Sun-JuORCID, Hwang Kyu-HaORCID, Jung Youn Kil, Kim Hyoun-Woo, Ryu Yoon-Hyun, Shvartzvald YossiORCID, Shin In-GuORCID, Yee Jennifer C.ORCID, Yang HongjingORCID, Zang Weicheng, Cha Sang-MokORCID, Kim DoeonORCID, Kim Dong-Jin, Kim Seung-Lee, Lee Dong-JooORCID, Lee Yongseok, Park Byeong-GonORCID, Pogge Richard W.ORCID, Mróz PrzemekORCID, Szymański Michał K., Skowron JanORCID, Poleski RadosławORCID, Soszyński IgorORCID, Pietrukowicz Paweł, Kozłowski Szymon, Rybicki Krzysztof A.ORCID, Iwanek Patryk, Ulaczyk Krzysztof, Wrona Marcin, Gromadzki MariuszORCID, Mróz Mateusz J.ORCID, Abe Fumio, Barry Richard, Bennett David P., Bhattacharya Aparna, Fujii Hirosame, Fukui Akihiko, Hamada Ryusei, Hirao Yuki, Silva Stela Ishitani, Itow Yoshitaka, Kirikawa Rintaro, Koshimoto Naoki, Matsubara YutakaORCID, Miyazaki Shota, Muraki Yasushi, Olmschenk GregORCID, Ranc ClémentORCID, Rattenbury Nicholas J.ORCID, Satoh Yuki, Sumi Takahiro, Suzuki Daisuke, Tomoyoshi Mio, Tristram Paul J.ORCID, Vandorou Aikaterini, Yama Hibiki, Yamashita Kansuke
Abstract
Aims. We undertake a project to reexamine microlensing data gathered from high-cadence surveys. The aim of the project is to reinvestigate lensing events whose light curves exhibit intricate anomaly features that are associated with caustics, but lack prior proposed models that would explain these features.
Methods. Through detailed reanalyses considering higher-order effects, we determined that it is vital to account for the orbital motions of lenses to accurately explain the anomaly features observed in the light curves of the lensing events OGLE-2018-BLG-0971, MOA-2023-BLG-065, and OGLE-2023-BLG-0136.
Results. We estimated the masses and distances to the lenses by conducting Bayesian analyses using the lensing parameters of the newly found lensing solutions. These analyses showed that the lenses of the events OGLE-2018-BLG-0971 and MOA-2023-BLG-065 are binaries composed of M dwarfs, while the lens of OGLE-2023-BLG-0136 likely is a binary composed of an early K-dwarf primary and a late M-dwarf companion. For all lensing events, the probability that the lens resides in the bulge is considerably higher than that it is located in the disk.
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