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arXiv · 2605.07392

Mass Production of 2023 KMTNet Microlensing Planets. III: Three Planets from the Subprime Field

Hongyu Li·Zhixing Li·Weicheng Zang·Yoon-Hyun Ryu·Andrzej Udalski·Takahiro Sumi·Hongjing Yang·Jiyuan Zhang·Shude Mao·Michael Albrow·Sun-Ju Chung·Andrew Gould·Cheongho Han·Kyu-Ha Hwang·Youn Kil Jung·In-Gu Shin·Yossi Shvartzvald·Jennifer Yee·Sang-Mok Cha·Dong-Jin Kim·Seung-Lee Kim·Chung-Uk Lee·Dong-Joo Lee·Yongseok Lee·Byeong-Gon Park·Richard Pogge·Przemek Mróz·Michał Szymański·Jan Skowron·Radoslaw Poleski·Igor Soszyński·Pawel Pietrukowicz·Szymon Kozłowski·Krzysztof Rybicki·Patryk Iwanek·Krzysztof Ulaczyk·Marcin Wrona·Mariusz Gromadzki·Mateusz J. Mróz·Fumio Abe·David Bennett·Aparna Bhattacharya·Ian Bond·Ryusei Hamada·Yuki Hirao·Stela Silva·Shota Miyazaki·Yasushi Muraki·Kansuke Nunota·Greg Olmschenk·Clément Ranc·Nicholas Rattenbury·Yuki Satoh·Daisuke Suzuki·Takuto Tamaoki·Sean Terry·Paul Tristram·Aikaterini Vandorou·Hibiki Yama
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Abstract

To complete the analysis of the 2023 KMTNet subprime-field microlensing planetary events identified by its AlertFinder system, we present the analysis of six events, KMT-2023-BLG-(1810, 0084, 1118, 0584, 1697, 2218). We find that the first three events are securely confirmed as planetary, with inferred mass ratios of $\log q \sim -1.9$, $-2.0$, and $-2.6$, respectively. The remaining three events exhibit the well-known degeneracy between binary-lens/single-source (2L1S) and single-lens/binary-source (1L2S) models, and two of these also admit viable stellar binary solutions. A Bayesian analysis indicates that the companions in the confirmed planetary events are likely either super-Jupiters orbiting beyond the snow line of M- or K-dwarf hosts or, for two degenerate solutions of KMT-2023-BLG-1118, Saturn-mass planets orbiting late-type M dwarfs. To date, the 2023 KMTNet sample contains 25 unambiguous planetary events, and its mass-ratio distribution is consistent with that of the KMTNet planetary sample from 2016--2019.

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Hongyu Li, Zhixing Li, Weicheng Zang, Yoon-Hyun Ryu, Andrzej Udalski, Takahiro Sumi, Hongjing Yang, Jiyuan Zhang, Shude Mao, Michael Albrow, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Youn Kil Jung, In-Gu Shin, Yossi Shvartzvald, Jennifer Yee, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard Pogge, Przemek Mróz, Michał Szymański, Jan Skowron, Radoslaw Poleski, Igor Soszyński, Pawel Pietrukowicz, Szymon Kozłowski, Krzysztof Rybicki, Patryk Iwanek, Krzysztof Ulaczyk, Marcin Wrona, Mariusz Gromadzki, Mateusz J. Mróz, Fumio Abe, David Bennett, Aparna Bhattacharya, Ian Bond, Ryusei Hamada, Yuki Hirao, Stela Silva, Shota Miyazaki, Yasushi Muraki, Kansuke Nunota, Greg Olmschenk, Clément Ranc, Nicholas Rattenbury, Yuki Satoh, Daisuke Suzuki, Takuto Tamaoki, Sean Terry, Paul Tristram, Aikaterini Vandorou, Hibiki Yama. 2026-05-08. Mass Production of 2023 KMTNet Microlensing Planets. III: Three Planets from the Subprime Field. https://arxiv.org/abs/2605.07392

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