Three binary-source binary-lens microlensing events from the 2024 microlensing campaign
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2025
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| author | Han, Cheongho Lee, Chung-Uk Udalski, Andrzej Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Jung, Youn Kil Hwang, Kyu-Ha Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yee, Jennifer C. Zang, Weicheng Yang, Hongjing Kim, Doeon Kim, Dong-Jin Park, Byeong-Gon Mróz, Przemek Szymański, Michał K. Skowron, Jan Poleski, Radosław Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Rybicki, Krzysztof A. Iwanek, Patryk Ulaczyk, Krzysztof Wrona, Marcin Gromadzki, Mariusz Mróz, Mateusz J. |
| author_facet | Han, Cheongho Lee, Chung-Uk Udalski, Andrzej Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Jung, Youn Kil Hwang, Kyu-Ha Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yee, Jennifer C. Zang, Weicheng Yang, Hongjing Kim, Doeon Kim, Dong-Jin Park, Byeong-Gon Mróz, Przemek Szymański, Michał K. Skowron, Jan Poleski, Radosław Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Rybicki, Krzysztof A. Iwanek, Patryk Ulaczyk, Krzysztof Wrona, Marcin Gromadzki, Mariusz Mróz, Mateusz J. |
| contents | We investigated microlensing events detected by the OGLE and KMTNet surveys during the 2024 observing season, focusing on those that exhibit very complex anomaly features. Through this analysis, we found that the light curves of three events including OGLE-2024-BLG-0657, KMT-2024-BLG-2017, and KMT-2024-BLG-2480 cannot be readily interpreted using standard three-body lensing models such as a binary lens with a single source (2L1S) or a single lens with a binary source (1L2S). In this work we present detailed analyses of these events to uncover the nature of their anomalous features. An initial analysis using 2L1S modeling of the light curves showed that while it was difficult to simultaneously explain all of the multiple anomaly features, the main anomaly feature could be accounted for. Based on this model, we conducted four-body modeling that includes an additional lens or source. Through this approach, we found that the complex anomalies observed in the three events could be explained by a 2L2S model, in which both the lens and the source are binaries. Analysis of the color and magnitude revealed that the source is a binary system consisting of G- and K-type main sequence stars for OGLE-2024-BLG-0657, two K-type main sequence stars for KMT-2024-BLG-2017, and a K-type star with an early G-type main sequence companion for KMT-2024-BLG-2480. A Bayesian analysis incorporating constraints from the lensing observables indicates that the lenses in KMT-2024-BLG-2017 and KMT-2024-BLG-2480 are likely binary systems of low-mass stars located in the Galactic bulge, whereas the lens system OGLE-2024-BLG-0657L is likely a binary composed of two stellar remnants situated in the Galactic disk. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_11495 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Three binary-source binary-lens microlensing events from the 2024 microlensing campaign Han, Cheongho Lee, Chung-Uk Udalski, Andrzej Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Jung, Youn Kil Hwang, Kyu-Ha Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yee, Jennifer C. Zang, Weicheng Yang, Hongjing Kim, Doeon Kim, Dong-Jin Park, Byeong-Gon Mróz, Przemek Szymański, Michał K. Skowron, Jan Poleski, Radosław Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Rybicki, Krzysztof A. Iwanek, Patryk Ulaczyk, Krzysztof Wrona, Marcin Gromadzki, Mariusz Mróz, Mateusz J. Solar and Stellar Astrophysics We investigated microlensing events detected by the OGLE and KMTNet surveys during the 2024 observing season, focusing on those that exhibit very complex anomaly features. Through this analysis, we found that the light curves of three events including OGLE-2024-BLG-0657, KMT-2024-BLG-2017, and KMT-2024-BLG-2480 cannot be readily interpreted using standard three-body lensing models such as a binary lens with a single source (2L1S) or a single lens with a binary source (1L2S). In this work we present detailed analyses of these events to uncover the nature of their anomalous features. An initial analysis using 2L1S modeling of the light curves showed that while it was difficult to simultaneously explain all of the multiple anomaly features, the main anomaly feature could be accounted for. Based on this model, we conducted four-body modeling that includes an additional lens or source. Through this approach, we found that the complex anomalies observed in the three events could be explained by a 2L2S model, in which both the lens and the source are binaries. Analysis of the color and magnitude revealed that the source is a binary system consisting of G- and K-type main sequence stars for OGLE-2024-BLG-0657, two K-type main sequence stars for KMT-2024-BLG-2017, and a K-type star with an early G-type main sequence companion for KMT-2024-BLG-2480. A Bayesian analysis incorporating constraints from the lensing observables indicates that the lenses in KMT-2024-BLG-2017 and KMT-2024-BLG-2480 are likely binary systems of low-mass stars located in the Galactic bulge, whereas the lens system OGLE-2024-BLG-0657L is likely a binary composed of two stellar remnants situated in the Galactic disk. |
| title | Three binary-source binary-lens microlensing events from the 2024 microlensing campaign |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2509.11495 |