Analyses of anomalous lensing events detected from the UKIRT microlensing survey
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arXiv
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| Formato: | Preprint |
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2025
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| author | Han, Cheongho Zang, Weicheng Udalski, Andrzej Lee, Chung-Uk Bond, Ian A. Wen, Yongxin Ma, Bo Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Hwang, Kyu-Ha Jung, Youn Kil Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yang, Hongjing Yee, Jennifer C. Kim, Doeon Kim, Dong-Jin Cha, Sang-Mok Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. 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. Abe, Fumio Bando, Ken Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki |
| author_facet | Han, Cheongho Zang, Weicheng Udalski, Andrzej Lee, Chung-Uk Bond, Ian A. Wen, Yongxin Ma, Bo Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Hwang, Kyu-Ha Jung, Youn Kil Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yang, Hongjing Yee, Jennifer C. Kim, Doeon Kim, Dong-Jin Cha, Sang-Mok Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. 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. Abe, Fumio Bando, Ken Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki |
| contents | The United Kingdom Infrared Telescope (UKIRT) microlensing survey was conducted over four years, from 2016 to 2019, with the goal of serving as a precursor to future near-infrared microlensing surveys (Shvartzvald et al. 2017). Focusing on stars in the Galactic center and utilizing near-infrared passbands, the survey identified approximately one thousand microlensing events, 27 of which displayed anomalies in their light curves (Wen et al. 2023). This paper presents an analysis of these anomalous events, aiming to uncover the underlying causes of the observed anomalies. The events were analyzed under various configurations, considering the potential binarity of both the lens and the source. For 11 events that were additionally observed by other optical microlensing surveys, including those conducted by the OGLE, KMTNet, and MOA collaborations, we incorporated their data into our analysis. Among the reported anomalous events, we revealed the nature of 24 events except for three events, in which one was likely to be a transient variable, and two were were difficult to accurately characterize their nature due to the limitations of the available data. We confirmed the binary lens nature of the anomalies in 22 events. Among these, we verified the earlier discovery that the companion in the binary lens system UKIRT11L is a planetary object. Accurately describing the anomaly in UKIRT21 required a model that accounted for the binarity of both the lens and the source. For two events UKIRT01 and UKIRT17, the anomalies could be interpreted using either a binary-source or a binary-lens model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_14789 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Analyses of anomalous lensing events detected from the UKIRT microlensing survey Han, Cheongho Zang, Weicheng Udalski, Andrzej Lee, Chung-Uk Bond, Ian A. Wen, Yongxin Ma, Bo Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Hwang, Kyu-Ha Jung, Youn Kil Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yang, Hongjing Yee, Jennifer C. Kim, Doeon Kim, Dong-Jin Cha, Sang-Mok Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. 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. Abe, Fumio Bando, Ken Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics The United Kingdom Infrared Telescope (UKIRT) microlensing survey was conducted over four years, from 2016 to 2019, with the goal of serving as a precursor to future near-infrared microlensing surveys (Shvartzvald et al. 2017). Focusing on stars in the Galactic center and utilizing near-infrared passbands, the survey identified approximately one thousand microlensing events, 27 of which displayed anomalies in their light curves (Wen et al. 2023). This paper presents an analysis of these anomalous events, aiming to uncover the underlying causes of the observed anomalies. The events were analyzed under various configurations, considering the potential binarity of both the lens and the source. For 11 events that were additionally observed by other optical microlensing surveys, including those conducted by the OGLE, KMTNet, and MOA collaborations, we incorporated their data into our analysis. Among the reported anomalous events, we revealed the nature of 24 events except for three events, in which one was likely to be a transient variable, and two were were difficult to accurately characterize their nature due to the limitations of the available data. We confirmed the binary lens nature of the anomalies in 22 events. Among these, we verified the earlier discovery that the companion in the binary lens system UKIRT11L is a planetary object. Accurately describing the anomaly in UKIRT21 required a model that accounted for the binarity of both the lens and the source. For two events UKIRT01 and UKIRT17, the anomalies could be interpreted using either a binary-source or a binary-lens model. |
| title | Analyses of anomalous lensing events detected from the UKIRT microlensing survey |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2503.14789 |