KMT-2021-BLG-0284, KMT-2022-BLG-2480, and KMT-2024-BLG-0412: Three microlensing events involving two lens masses and two source stars
Year: 2024
Type: article
Abstract: Aims. We carried out a project involving the systematic analysis of microlensing data from the Korea Microlensing Telescope Network survey. The aim of this project is to identify lensing events with complex anomaly features that are difficult to explain using standard binary-lens or binary-source models. Methods. Our investigation reveals that the light curves of microlensing events KMT-2021-BLG-0284, KMT-2022-BLG-2480, and KMT-2024-BLG-0412 display highly complex patterns with three or more anomaly features. These features cannot be adequately explained by a binary-lens (2L1S) model alone. However, the 2L1S model can effectively describe certain segments of the light curve. By incorporating an additional source into the modeling, we identified a comprehensive model that accounts for all the observed anomaly features. Results. Bayesian analysis, based on constraints provided by lensing observables, indicates that the lenses of KMT-2021-BLG-0284 and KMT-2024-BLG-0412 are binary systems composed of M dwarfs. For KMT-2022-BLG-2480, the primary lens is an early K-type main-sequence star with an M dwarf companion. The lenses of KMT-2021-BLG-0284 and KMT-2024-BLG-0412 are likely located in the bulge, whereas the lens of KMT-2022-BLG-2480 is more likely situated in the disk. In all events, the binary stars of the sources have similar magnitudes due to a detection bias favoring binary source events with a relatively bright secondary source star, which increases detection efficiency.
Authors: Cheongho Han, Andrzej Udalski, Ian A. Bond, Chung-Uk Lee, Andrew Gould, Michael D. Albrow, Sun-Ju Chung, Kyu-Ha Hwang, Youn Kil Jung, Yoon-Hyun Ryu, Yossi Shvartzvald, In-Gu Shin, Jennifer C. Yee, Hongjing Yang, Weicheng Zang, Sang-Mok Cha, Doeon Kim, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radosław Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof A. Rybicki, Patryk Iwanek, Krzysztof Ulaczyk, Marcin Wrona, Mariusz Gromadzki, Mateusz J. Mróz, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Hirosame Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Naoki Koshimoto, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita
Institutions: Chungbuk National University, University of Warsaw, Massey University, Korea Astronomy and Space Science Institute, Max Planck Institute for Astronomy, The Ohio State University, University of Canterbury, Weizmann Institute of Science, Center for Astrophysics Harvard & Smithsonian, Tsinghua University, Kyung Hee University, University of Warwick, Villanova University, Nagoya University, Goddard Space Flight Center, University of Maryland, College Park, Instituto de Astrofísica de Canarias, The University of Tokyo, The University of Osaka, Catholic University of America, Centre National de la Recherche Scientifique, Institut d'Astrophysique de Paris, Sorbonne Université, University of Auckland
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, Smithsonian Institution, Alexander von Humboldt-Stiftung, National Natural Science Foundation of China, Korea Astronomy and Space Science Institute, Ministry of Science and ICT, South Korea, Korea Research Environment Open Network, Smithsonian Astrophysical Observatory, Japan Society for the Promotion of Science
Awards: G2899887924, Search for free-floating planets by using gravitational microlensing, Microlensing Survey for Exoplanets beyond the Snow Line, NSF-BSF: The Frequency and Mass-Ratio Distribution of Super-Earths in KMTNet, G4603282809, 近赤外線重力マイクロレンズ観測による冷たい系外惑星・浮遊惑星の形成過程の解明, G5852785454, 重力マイクロレンズによる地球質量系外惑星、浮遊惑星の探索, Search for extrasolar planets with microlensing follow-up observations, Search for cold exoplanets and free-floating planets by near infrared gravitational microlensing observation
OpenAlex ID: W6959539643
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