Cover Image

Saved in:
Bibliographic Details
Main Authors: 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.
Format: Preprint
Published: 2026
Subjects:
Earth and Planetary Astrophysics
Online Access:https://arxiv.org/abs/2603.09045
Tags: Add Tag
No Tags, Be the first to tag this record!
Table of 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.

Similar Items