Candidate Microlensing Brown Dwarfs in Binary Lens Systems from the 2023--2025 Observing Seasons
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2026
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| author | Han, Cheongho Udalski, Andrzej Bond, Ian A. Lee, Chung-Uk 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 Kim, Seung-Lee Lee, Dong-Joo Cha, Sang-Mok 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 Bennett, David P. Bhattacharya, Aparna Hamada, Ryusei Hirao, Yuki Idei, Asahi Silva, Stela Ishitani Makida, Shuma Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nagano, Togo Nakayama, Seiya Nishio, Mayu Nunota, Kansuke Ogawa, Ryo Oishi, Ryunosuke Okumoto, Yui Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Tamaoki, Takuto Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki |
| author_facet | Han, Cheongho Udalski, Andrzej Bond, Ian A. Lee, Chung-Uk 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 Kim, Seung-Lee Lee, Dong-Joo Cha, Sang-Mok 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 Bennett, David P. Bhattacharya, Aparna Hamada, Ryusei Hirao, Yuki Idei, Asahi Silva, Stela Ishitani Makida, Shuma Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nagano, Togo Nakayama, Seiya Nishio, Mayu Nunota, Kansuke Ogawa, Ryo Oishi, Ryunosuke Okumoto, Yui Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Tamaoki, Takuto Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki |
| contents | We present detailed light-curve analyses of ten binary-lens microlensing events observed during the 2023--2025 seasons and selected as candidates for hosting brown-dwarf companions. The sample includes OGLE-2023-BLG-0249, KMT-2023-BLG-1246, OGLE-2023-BLG-0079, KMT-2024-BLG-0072, KMT-2024-BLG-0897, KMT-2024-BLG-1876, KMT-2024-BLG-2379, KMT-2025-BLG-0922, KMT-2025-BLG-1056, and KMT-2025-BLG-2427. For each event, we carry out modeling of the light curve, explore relevant degeneracies, and, when finite-source effects are present, determine the angular Einstein radius. For OGLE-2023-BLG-0249, we additionally measure the microlens parallax, which allows a direct determination of the lens masses and distance. For the remaining events, we estimate the physical lens properties via Bayesian analyses incorporating Galactic priors. The resulting posteriors show that the lens companions in all systems have median masses in the brown-dwarf regime, and the lenses of two events (KMT-2025-BLG-0922 and KMT-2025-BLG-1056) are consistent with binaries in which both lens components fall within the brown-dwarf mass range. Spanning a wide range of projected separations and distances, these detections illustrate the power of high-cadence microlensing surveys to build a census of brown-dwarf companions, including faint and distant systems beyond the reach of flux-limited methods. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_07932 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Candidate Microlensing Brown Dwarfs in Binary Lens Systems from the 2023--2025 Observing Seasons Han, Cheongho Udalski, Andrzej Bond, Ian A. Lee, Chung-Uk 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 Kim, Seung-Lee Lee, Dong-Joo Cha, Sang-Mok 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 Bennett, David P. Bhattacharya, Aparna Hamada, Ryusei Hirao, Yuki Idei, Asahi Silva, Stela Ishitani Makida, Shuma Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nagano, Togo Nakayama, Seiya Nishio, Mayu Nunota, Kansuke Ogawa, Ryo Oishi, Ryunosuke Okumoto, Yui Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Tamaoki, Takuto Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki Solar and Stellar Astrophysics Earth and Planetary Astrophysics We present detailed light-curve analyses of ten binary-lens microlensing events observed during the 2023--2025 seasons and selected as candidates for hosting brown-dwarf companions. The sample includes OGLE-2023-BLG-0249, KMT-2023-BLG-1246, OGLE-2023-BLG-0079, KMT-2024-BLG-0072, KMT-2024-BLG-0897, KMT-2024-BLG-1876, KMT-2024-BLG-2379, KMT-2025-BLG-0922, KMT-2025-BLG-1056, and KMT-2025-BLG-2427. For each event, we carry out modeling of the light curve, explore relevant degeneracies, and, when finite-source effects are present, determine the angular Einstein radius. For OGLE-2023-BLG-0249, we additionally measure the microlens parallax, which allows a direct determination of the lens masses and distance. For the remaining events, we estimate the physical lens properties via Bayesian analyses incorporating Galactic priors. The resulting posteriors show that the lens companions in all systems have median masses in the brown-dwarf regime, and the lenses of two events (KMT-2025-BLG-0922 and KMT-2025-BLG-1056) are consistent with binaries in which both lens components fall within the brown-dwarf mass range. Spanning a wide range of projected separations and distances, these detections illustrate the power of high-cadence microlensing surveys to build a census of brown-dwarf companions, including faint and distant systems beyond the reach of flux-limited methods. |
| title | Candidate Microlensing Brown Dwarfs in Binary Lens Systems from the 2023--2025 Observing Seasons |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2604.07932 |