KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS

Abstract 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 and the Dark Energy Camera 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 ∼ 5 × 10 −4 . A Bayesian analysis yields a host-star mass of ∼0.3 M ⊙ , a planetary mass of ∼40 M ⊕ , a projected planet-host separation of ∼1.6 au, and a lens distance of ∼7.5 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.

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Publication Details

Journal
The Astronomical Journal
Published
2026-02-12
DOI
https://doi.org/10.3847/1538-3881/ae36ac
Primary Topic
Stellar, planetary, and galactic studies
Type
article
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article

KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS

Ryo Ogawa, Sean K. Terry, Steve Heathcote, Ryunosuke Oishi et al.
The Astronomical Journal
Stellar, planetary, and galactic studies
article

KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS

Ryo Ogawa, Sean K. Terry, Steve Heathcote, Ryunosuke Oishi, Ryusei Hamada, K. Kruszyńska, Xikai Shan, Eric W. Peng, Asahi Idei, Shuma Makida, Takuto Tamaoki, Yuchen Tang, Quanzhi Ye, Tutumi Nagai, Yuki Hirao, Hibiki Yama, In-Gu Shin, Chung-Uk Lee, Guillermo Damke, Patrick Tamburo, Qiyue Qian, Yui Okumoto, Shota Miyazaki, Zhixing Li, Seiya Nakayama, Timothy Cunningham, Togo Nagano, Yuxin Shang, Mayu Nishio, Hongjing 弘靖 Yang 杨, Ian A. Bond, Yiannis Tsapras, Markus Hundertmark, Hongyu 弘禹 Li 李, Nicholas J. Rattenbury, Kansuke Nunota, Andrew Gould, Yossi Shvartzvald, (Leading Authors), Przemek Mróz, Daisuke SUZUKI, Weicheng 伟呈 Zang 臧, Michael D. Albrow, Matthew Penny, Takahiro Sumi, Jennifer C. Yee, Motohide Tamura, Cheongho Han, Rachel Street, Alfredo Zenteno, Sun-Ju Chung, Youn Kil Jung, Shude Mao, Dong-Jin Kim, Xiurui Zhao, Kyu-Ha Hwang, David P. Bennett, Jiyuan 纪元 Zhang 张, Etienne Bachelet, Konstantina Boutsia, Yoon-Hyun Ryu, Byeong-Gon Park
article en

Abstract

Abstract 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 and the Dark Energy Camera 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 ∼ 5 × 10 −4 . A Bayesian analysis yields a host-star mass of ∼0.3 M ⊙ , a planetary mass of ∼40 M ⊕ , a projected planet-host separation of ∼1.6 au, and a lens distance of ∼7.5 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.

The Astronomical JournalVol. 171(3)
Openalex Percentile: Top 56%
Stellar, planetary, and galactic studies
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