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| Format: | Preprint |
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2026
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| Online-Zugang: | https://arxiv.org/abs/2603.09045 |
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| author | Tang, Yuchen Zang, Weicheng Ryu, Yoon-Hyun Udalski, Andrzej Yang, Hongjing Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon de Almeida, Leandro Tang, Yunyi Li, Zhixing Zhang, Jiyuan Li, Hongyu Mao, Shude Qian, Qiyue Maoz, Dan Borges, Christian Elias Kalaki, Fabrício Santos Júnior, Altair Ramos Gomes Zhu, Wei 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 | Tang, Yuchen Zang, Weicheng Ryu, Yoon-Hyun Udalski, Andrzej Yang, Hongjing Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon de Almeida, Leandro Tang, Yunyi Li, Zhixing Zhang, Jiyuan Li, Hongyu Mao, Shude Qian, Qiyue Maoz, Dan Borges, Christian Elias Kalaki, Fabrício Santos Júnior, Altair Ramos Gomes Zhu, Wei 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 present observations and analysis of two low planet/host mass-ratio ($q$) microlensing planets discovered in high-magnification events. KMT-2025-BLG-0811Lb has $q \sim 4.5 \times 10^{-5}$, and a Bayesian analysis favors a super-Earth/mini-Neptune orbiting an M- or K-dwarf host at a projected separation of $\sim 3$ au. KMT-2025-BLG-0912Lb has $q = 2.6 \times 10^{-4}$ and likely hosts a super-Earth/mini-Neptune around either a low-mass M dwarf or a brown dwarf at $\sim 1$ au. Even with an observing cadence of $Γ> 30~{\rm hr}^{-1}$ during the planetary signal, KMT-2025-BLG-0811 still exhibits the "central-resonant" degeneracy. Reviewing nine such events, we find that the "central-resonant" degeneracy can be divided into two distinct types that occupy separate regions in the plane of $q$ and normalized source radius ($ρ$). Type~I events have similar $q$ but substantially different $ρ$ and are more difficult to resolve from the light curves. For Type~II events, the "resonant" solutions have relatively lower $q$ and larger $ρ$. Our review provides guidance for searching for the alternative solution once one solution has been identified. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_09045 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Two Low Mass-Ratio Microlensing Planets and Two Types of Central-Resonant Degeneracy Tang, Yuchen Zang, Weicheng Ryu, Yoon-Hyun Udalski, Andrzej Yang, Hongjing Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon de Almeida, Leandro Tang, Yunyi Li, Zhixing Zhang, Jiyuan Li, Hongyu Mao, Shude Qian, Qiyue Maoz, Dan Borges, Christian Elias Kalaki, Fabrício Santos Júnior, Altair Ramos Gomes Zhu, Wei 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. Earth and Planetary Astrophysics We present observations and analysis of two low planet/host mass-ratio ($q$) microlensing planets discovered in high-magnification events. KMT-2025-BLG-0811Lb has $q \sim 4.5 \times 10^{-5}$, and a Bayesian analysis favors a super-Earth/mini-Neptune orbiting an M- or K-dwarf host at a projected separation of $\sim 3$ au. KMT-2025-BLG-0912Lb has $q = 2.6 \times 10^{-4}$ and likely hosts a super-Earth/mini-Neptune around either a low-mass M dwarf or a brown dwarf at $\sim 1$ au. Even with an observing cadence of $Γ> 30~{\rm hr}^{-1}$ during the planetary signal, KMT-2025-BLG-0811 still exhibits the "central-resonant" degeneracy. Reviewing nine such events, we find that the "central-resonant" degeneracy can be divided into two distinct types that occupy separate regions in the plane of $q$ and normalized source radius ($ρ$). Type~I events have similar $q$ but substantially different $ρ$ and are more difficult to resolve from the light curves. For Type~II events, the "resonant" solutions have relatively lower $q$ and larger $ρ$. Our review provides guidance for searching for the alternative solution once one solution has been identified. |
| title | Two Low Mass-Ratio Microlensing Planets and Two Types of Central-Resonant Degeneracy |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2603.09045 |