MOA-2022-BLG-033Lb, KMT-2023-BLG-0119Lb, and KMT-2023-BLG-1896Lb: Three low mass-ratio microlensing planets detected through dip signals
Year: 2025
Type: article
Abstract: Aims. We examined the anomalies in the light curves of the lensing events MOA-2022-BLG-033, KMT-2023-BLG-0119, and KMT- 2023-BLG-1896. These anomalies share similar traits: they occur near the peak of moderately to highly magnified events and display a distinct short-term dip feature. Methods. We conducted detailed modeling of the light curves to uncover the nature of the anomalies. This modeling revealed that all signals originated from planetary companions to the primary lens. The planet-to-host mass ratios are very low: q ~ 7.5 × 10−5 for MOA-2022-BLG-033, q ~ 3.6 × 10−4 for KMT-2023-BLG-0119, and q ~ 6.9 × 10−5 for KMT-2023-BLG-1896. The anomalies occurred as the source passed through the negative deviation region behind the central caustic along the planet-host axis. The solutions are subject to a common inner-outer degeneracy, which results in varying estimations of the projected planet-host separation. For KMT-2023-BLG-1896, although the planetary scenario provides the best explanation for the anomaly, the binary companion scenario is possible. Results. We estimated the physical parameters of the planetary systems through Bayesian analyses based on the lensing observables. While the event timescale was measured for all events, the angular Einstein radius was not measured for any. Additionally, the microlens parallax was measured for MOA-2022-BLG-033. The analysis identifies MOA-2022-BLG-033L as a planetary system with an ice giant with a mass of approximately 12 times that of Earth orbiting an early M dwarf star. The companion of KMT-2023-BLG-1896L is also an ice giant, with a mass of around 16 Earth masses, orbiting a mid-K-type main-sequence star. The companion of KMT-2023-BLG- 0119L, which has a mass around that of Saturn, orbits a mid-K-type dwarf star. The lens for MOA-2022-BLG-033 is highly likely to be located in the disk, whereas for the other events the probabilities of the lens being in the disk or the bulge are roughly equal.
Authors: Cheongho Han, Ian A. Bond, Youn Kil Jung, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Kyu-Ha Hwang, Chung-Uk Lee, Yoon-Hyun Ryu, Yossi Shvartzvald, In-Gu Shin, Jennifer C. Yee, Hongjing Yang, Weicheng Zang, Sang-Mok Cha, Doeon Kim, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Hirosame Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Naoki Koshimoto, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita
Institutions: Chungbuk National University, Massey University, Korea Astronomy and Space Science Institute, University of Canterbury, Max Planck Institute for Astronomy, The Ohio State University, Weizmann Institute of Science, Center for Astrophysics Harvard & Smithsonian, Tsinghua University, Kyung Hee University, Nagoya University, Goddard Space Flight Center, University of Maryland, College Park, Instituto de Astrofísica de Canarias, The University of Tokyo, The University of Osaka, Oak Ridge Associated Universities, Centre National de la Recherche Scientifique, Institut d'Astrophysique de Paris, Sorbonne Université, University of Auckland
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, Smithsonian Institution, Alexander von Humboldt-Stiftung, National Natural Science Foundation of China, Korea Astronomy and Space Science Institute, Ministry of Science and ICT, South Korea, Korea Research Environment Open Network, Smithsonian Astrophysical Observatory, Japan Society for the Promotion of Science
Awards: G2899887924, Search for free-floating planets by using gravitational microlensing, Microlensing Survey for Exoplanets beyond the Snow Line, G3749045598, NSF-BSF: The Frequency and Mass-Ratio Distribution of Super-Earths in KMTNet, 近赤外線重力マイクロレンズ観測による冷たい系外惑星・浮遊惑星の形成過程の解明, 重力マイクロレンズによる地球質量系外惑星、浮遊惑星の探索, Search for extrasolar planets with microlensing follow-up observations, Search for cold exoplanets and free-floating planets by near infrared gravitational microlensing observation
OpenAlex ID: W7111147762
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