KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS
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| Format: | Preprint |
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2026
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| _version_ | 1866908831041191936 |
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| author | Yang, Hongjing Zang, Weicheng Ryu, Yoon-Hyun Sumi, Takahiro Zhang, Jiyuan Li, Hongyu Han, Cheongho Tang, Yuchen Qian, Qiyue Li, Zhixing Shang, Yuxin Shan, Xikai Mao, Shude Damke, Guillermo Zenteno, Alfredo Heathcote, Steve Boutsia, Konstantina Mróz, Przemek Zhao, Xiurui Penny, Matthew Terry, Sean Tamburo, Patrick Cunningham, Timothy Ye, Quanzhi Peng, Eric W. Street, Rachel Kruszyńska, Katarzyna Bachelet, Etienne Tsapras, Yiannis Hundertmark, Markus Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Bennett, David P. Bond, Ian A. Cataldo, Giuseppe Hamada, Ryusei Hirao, Yuki Idei, Asahi Makida, Shuma Miyazaki, Shota Nagai, Tutumi Nagano, Togo Nakayama, Seiya Nishio, Mayu Nunota, Kansuke Ogawa, Ryo Oishi, Ryunosuke Okumoto, Yui Rattenbury, Nicholas J. Satoh, Yuki K. Suzuki, Daisuke Tamura, Motohide Tamaoki, Takuto Yama, Hibiki |
| author_facet | Yang, Hongjing Zang, Weicheng Ryu, Yoon-Hyun Sumi, Takahiro Zhang, Jiyuan Li, Hongyu Han, Cheongho Tang, Yuchen Qian, Qiyue Li, Zhixing Shang, Yuxin Shan, Xikai Mao, Shude Damke, Guillermo Zenteno, Alfredo Heathcote, Steve Boutsia, Konstantina Mróz, Przemek Zhao, Xiurui Penny, Matthew Terry, Sean Tamburo, Patrick Cunningham, Timothy Ye, Quanzhi Peng, Eric W. Street, Rachel Kruszyńska, Katarzyna Bachelet, Etienne Tsapras, Yiannis Hundertmark, Markus Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Bennett, David P. Bond, Ian A. Cataldo, Giuseppe Hamada, Ryusei Hirao, Yuki Idei, Asahi Makida, Shuma Miyazaki, Shota Nagai, Tutumi Nagano, Togo Nakayama, Seiya Nishio, Mayu Nunota, Kansuke Ogawa, Ryo Oishi, Ryunosuke Okumoto, Yui Rattenbury, Nicholas J. Satoh, Yuki K. Suzuki, Daisuke Tamura, Motohide Tamaoki, Takuto Yama, Hibiki |
| contents | We present observations and analysis of the bound planetary microlensing event KMT-2025-BLG-1616. The planetary signal was captured by the Korea Microlensing Telescope Network (KMTNet) and the DECam Rogue Earths and Mars Survey (DREAMS). DREAMS's minute-cadence observations break the central/resonant degeneracy in the binary-lens models. The color of the faint source star ($I=22$) is measured from the DREAMS's $r - z$ color. The planetary system has a planet-host mass ratio of $q \sim 5 \times 10^{-4}$. A Bayesian analysis yields a host-star mass of $\sim 0.3\,M_\odot$, a planetary mass of $\sim 40\,M_{\oplus}$, a projected planet-host separation of $\sim 1.6~\mathrm{au}$, and a lens distance of $\sim 7.5~\mathrm{kpc}$. Based on the photometric precision achieved by DREAMS for this event, we simulate free-floating planet (FFP) detections and find that DREAMS is sensitive to Mars-mass FFPs in the Galactic bulge and Moon-mass FFPs in the Galactic disk. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_11469 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS Yang, Hongjing Zang, Weicheng Ryu, Yoon-Hyun Sumi, Takahiro Zhang, Jiyuan Li, Hongyu Han, Cheongho Tang, Yuchen Qian, Qiyue Li, Zhixing Shang, Yuxin Shan, Xikai Mao, Shude Damke, Guillermo Zenteno, Alfredo Heathcote, Steve Boutsia, Konstantina Mróz, Przemek Zhao, Xiurui Penny, Matthew Terry, Sean Tamburo, Patrick Cunningham, Timothy Ye, Quanzhi Peng, Eric W. Street, Rachel Kruszyńska, Katarzyna Bachelet, Etienne Tsapras, Yiannis Hundertmark, Markus Albrow, Michael D. Chung, Sun-Ju Gould, Andrew Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Bennett, David P. Bond, Ian A. Cataldo, Giuseppe Hamada, Ryusei Hirao, Yuki Idei, Asahi Makida, Shuma Miyazaki, Shota Nagai, Tutumi Nagano, Togo Nakayama, Seiya Nishio, Mayu Nunota, Kansuke Ogawa, Ryo Oishi, Ryunosuke Okumoto, Yui Rattenbury, Nicholas J. Satoh, Yuki K. Suzuki, Daisuke Tamura, Motohide Tamaoki, Takuto Yama, Hibiki Earth and Planetary Astrophysics Astrophysics of Galaxies We present observations and analysis of the bound planetary microlensing event KMT-2025-BLG-1616. The planetary signal was captured by the Korea Microlensing Telescope Network (KMTNet) and the DECam Rogue Earths and Mars Survey (DREAMS). DREAMS's minute-cadence observations break the central/resonant degeneracy in the binary-lens models. The color of the faint source star ($I=22$) is measured from the DREAMS's $r - z$ color. The planetary system has a planet-host mass ratio of $q \sim 5 \times 10^{-4}$. A Bayesian analysis yields a host-star mass of $\sim 0.3\,M_\odot$, a planetary mass of $\sim 40\,M_{\oplus}$, a projected planet-host separation of $\sim 1.6~\mathrm{au}$, and a lens distance of $\sim 7.5~\mathrm{kpc}$. Based on the photometric precision achieved by DREAMS for this event, we simulate free-floating planet (FFP) detections and find that DREAMS is sensitive to Mars-mass FFPs in the Galactic bulge and Moon-mass FFPs in the Galactic disk. |
| title | KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.11469 |