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Main Authors: Li, Hongyu, Zhang, Jiyuan, Han, Cheongho, Zang, Weicheng, Jung, Youn Kil, Udalski, Andrzej, Sumi, Takahiro, Yang, Hongjing, Kuang, Renkun, Mao, Shude, Albrow, Michael D., Chung, Sun-Ju, Gould, Andrew, Hwang, Kyu-Ha, Ryu, Yoon-Hyun, Shin, In-Gu, Shvartzvald, Yossi, Yee, Jennifer C., Cha, Sang-Mok, Kim, Dong-Jin, Kim, Seung-Lee, Lee, Chung-Uk, Lee, Dong-Joo, Lee, Yongseok, Park, Byeong-Gon, Pogge, Richard W., Monard, Berto, Tang, Yunyi, Dong, Subo, Liu, Zhuokai, Christie, Grant, McCormick, Jennie, Natusch, Tim, Qian, Qiyue, Maoz, Dan, Zhu, Wei, Mróz, Przemek, Szymański, Michał K., Skowron, Jan, Poleski, Radoslaw, Soszyński, Igor, Pietrukowicz, Paweł, Kozłowski, Szymon, Rybicki, Krzysztof A., Iwanek, Patryk, Ulaczyk, Krzysztof, Wrona, Marcin, Gromadzki, Mariusz, Mróz, Mateusz J., Abe, Fumio, Bando, Ken, Bennett, David P., Bhattacharya, Aparna, Bond, Ian A., Fukui, Akihiko, Hamada, Ryusei, Hamada, Shunya, Hamasak, Naoto, Hirao, Yuki, Silva, Stela Ishitani, Koshimoto, Naoki, Matsubara, Yutaka, Miyazaki, Shota, Muraki, Yasushi, Nagai, Tutumi, Nunota, Kansuke, Olmschenk, Greg, Ranc, Clément, Rattenbury, Nicholas J., Satoh, Yuki, Suzuki, Daisuke, Terry, Sean, Tristram, Paul J., Vandorou, Aikaterini, Yama, Hibiki
Format: Preprint
Published: 2025
Subjects:
Earth and Planetary Astrophysics
Solar and Stellar Astrophysics
Online Access:https://arxiv.org/abs/2505.05093
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Table of Contents:
  • We present the discovery and analysis of the sixth microlensing two-planet system, KMT-2022-BLG-1818Lb,c, detected by a follow-up program targeting high-magnification events. Both planets are subject to the well-known ''Close/Wide'' degeneracy, although for the first planet, which has a super-Jovian mass ratio of $q_2 \simeq 5\times 10^{-3}$ in both solutions, the Close topology, with a normalized separation of $s\simeq 0.70$, is clearly preferred by $Δχ^2=26$. However, contrary to all previous two-planet microlensing systems, the mass ratio for the second planet, $q_3$, is substantially (factor of $\sim 10$) different for the Close and Wide topologies of the first planet. While this degeneracy is resolved in the present case due to high-cadence follow-up observations, the appearance of this new degeneracy indicates the need for caution in the analysis of future two-planet systems. A Bayesian analysis suggests that the host is likely a K-dwarf star in the Galactic disk. The first planet is probably a super-Jupiter on a Jupiter-like orbit, while the second planet is a Saturn-class planet on either a Mercury-like or Saturn-like orbit.

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