KMT-2025-BLG-1314 and KMT-2025-BLG-1392: two microlensing planetary/brown-dwarf candidates analyzed with differentiable code
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| author | Ren, Haibin Zang, Weicheng Zhu, Wei Ryu, Yoon-Hyun Tang, Yuchen Zhang, Jiyuan Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yang, Hongjing Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Tang, Yunyi Maoz, Dan Mao, Shude Qian, Qiyue |
| author_facet | Ren, Haibin Zang, Weicheng Zhu, Wei Ryu, Yoon-Hyun Tang, Yuchen Zhang, Jiyuan Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yang, Hongjing Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Tang, Yunyi Maoz, Dan Mao, Shude Qian, Qiyue |
| contents | Analysis of binary-lens microlensing events typically requires intensive computation because of the multimodal and complex posterior distributions. With the recent development of the JAX-based differentiable binary-lensing modeling package microlux, we present an analysis of two microlensing events with planet/brown-dwarf candidates, KMT-2025-BLG-1314 and KMT-2025-BLG-1392. Both events exhibit the "Close/Wide" degeneracy, and KMT-2025-BLG-1314 suffers from the "Planet/Binary" degeneracy and a recently recognized "Point/Finite" degeneracy among the planetary solutions. For KMT-2025-BLG-1314, the binary mass ratio is $\log q \sim -3.5$ for the planetary solutions and $\log q > -1.5$ for the binary solutions, while for KMT-2025-BLG-1392, we find $\log q \sim -1.3$. We show that for the analysis of KMT-2025-BLG-1314, Hamiltonian Monte Carlo (HMC), enabled by microlux, provides robust parameter inference and outperforms traditional Markov chain Monte Carlo (MCMC) methods in the presence of bimodal posteriors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_01735 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | KMT-2025-BLG-1314 and KMT-2025-BLG-1392: two microlensing planetary/brown-dwarf candidates analyzed with differentiable code Ren, Haibin Zang, Weicheng Zhu, Wei Ryu, Yoon-Hyun Tang, Yuchen Zhang, Jiyuan Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yang, Hongjing Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Tang, Yunyi Maoz, Dan Mao, Shude Qian, Qiyue Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics Analysis of binary-lens microlensing events typically requires intensive computation because of the multimodal and complex posterior distributions. With the recent development of the JAX-based differentiable binary-lensing modeling package microlux, we present an analysis of two microlensing events with planet/brown-dwarf candidates, KMT-2025-BLG-1314 and KMT-2025-BLG-1392. Both events exhibit the "Close/Wide" degeneracy, and KMT-2025-BLG-1314 suffers from the "Planet/Binary" degeneracy and a recently recognized "Point/Finite" degeneracy among the planetary solutions. For KMT-2025-BLG-1314, the binary mass ratio is $\log q \sim -3.5$ for the planetary solutions and $\log q > -1.5$ for the binary solutions, while for KMT-2025-BLG-1392, we find $\log q \sim -1.3$. We show that for the analysis of KMT-2025-BLG-1314, Hamiltonian Monte Carlo (HMC), enabled by microlux, provides robust parameter inference and outperforms traditional Markov chain Monte Carlo (MCMC) methods in the presence of bimodal posteriors. |
| title | KMT-2025-BLG-1314 and KMT-2025-BLG-1392: two microlensing planetary/brown-dwarf candidates analyzed with differentiable code |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2603.01735 |