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arXiv · 2606.27725

KMT-2025-BLG-2093: Free-Floating Planet Candidate Near the Shore of the Einstein Desert

Yoon-Hyun Ryu·Andrew Gould·Kyu-Ha Hwang·Qiyue Qian·Michael D. Albrow·Sun-Ju Chung·Cheongho Han·Youn Kil Jung·Zhixing Li·Shude Mao·In-Gu Shin·Yossi Shvartzvald·Hongjing Yang·Jennifer C. Yee·Weicheng Zang·Dong-Jin Kim·Chung-Uk Lee·Byeong-Gon Park·Richard W. Pogge
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Abstract

We analyze KMT-2025-BLG-2093, with angular Einstein radius $\theta_{\rm E}=13.1\pm 2.8\,\mu{\rm as}$, which makes it the second isolated microlens that lies in the ``Einstein Desert'' ($9\,\mu{\rm as}<\theta_{\rm E}<25\,\mu{\rm as}$) between free-floating planets (FFPs) on one side and brown dwarfs and stars on the other. We discuss how its characteristics may give clues to future exploration of FFPs, especially in the era of satellite missions that have a major FFP focus, including Earth 2.0 and Roman.

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Yoon-Hyun Ryu, Andrew Gould, Kyu-Ha Hwang, Qiyue Qian, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Youn Kil Jung, Zhixing Li, Shude Mao, In-Gu Shin, Yossi Shvartzvald, Hongjing Yang, Jennifer C. Yee, Weicheng Zang, Dong-Jin Kim, Chung-Uk Lee, Byeong-Gon Park, Richard W. Pogge. 2026-06-26. KMT-2025-BLG-2093: Free-Floating Planet Candidate Near the Shore of the Einstein Desert. https://arxiv.org/abs/2606.27725

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