Year: 2024
Type: article
Abstract: Aims. Building on previous works to construct a homogeneous sample of brown dwarfs in binary systems, we investigate microlensing events detected by the Korea Microlensing Telescope Network (KMTNet) survey during the 2022 and 2023 seasons. Methods. Given the difficulty in distinguishing brown-dwarf events from those produced by binary lenses with nearly equal-mass components, we analyze all lensing events detected during the seasons that exhibit anomalies characteristic of binary-lens systems. Results. Using the same criteria consistently applied in previous studies, we identify six additional brown dwarf candidates through the analysis of lensing events KMT-2022-BLG-0412, KMT-2022-BLG-2286, KMT-2023-BLG-0201, KMT-2023-BLG-0601, KMT-2023-BLG-1684, and KMT-2023-BLG-1743. An examination of the mass posteriors shows that the median mass of the lens companions ranges from 0.02 M⊙ to 0.05 M⊙, indicating that these companions fall within the brown-dwarf mass range. The mass of the primary lenses ranges from 0.11 M⊙ to 0.68 M⊙, indicating that they are low-mass stars with substantially lower masses compared to the Sun.
Authors: Cheongho Han, Ian A. Bond, Andrzej Udalski, Chung-Uk Lee, Andrew Gould, Michael D. Albrow, Sun-Ju Chung, Kyu-Ha Hwang, Youn Kil Jung, 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, Ken Bando, Richard Barry, David P. Bennett, Aparna Bhattacharya, Hirosame Fujii, Akihiko Fukui, Ryusei Hamada, Shunya Hamada, Naoto Hamasaki, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Naoki Koshimoto, Yutaka Matsubara, Shota Miyazaki, Yasushi Muraki, Tutumi Nagai, Kansuke Nunota, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radosław Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof A. Rybicki, Patryk Iwanek, Krzysztof Ulaczyk, Marcin Wrona, Mariusz Gromadzki, Mateusz J. Mróz
Institutions: Chungbuk National University, Massey University, University of Warsaw, Korea Astronomy and Space Science Institute, Max Planck Institute for Astronomy, The Ohio State University, University of Canterbury, Weizmann Institute of Science, Center for Astrophysics Harvard & Smithsonian, Tsinghua University, Kyung Hee University, Nagoya University, The University of Osaka, Goddard Space Flight Center, University of Maryland, College Park, Instituto de Astrofísica de Canarias, The University of Tokyo, Oak Ridge Associated Universities, Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, Centre National de la Recherche Scientifique, Institut d'Astrophysique de Paris, Sorbonne Université, University of Auckland, University of Warwick, Villanova University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, Smithsonian Institution, National Research Foundation, National Natural Science Foundation of China, Korea Astronomy and Space Science Institute, National Research Foundation of Korea, Ministry of Science and ICT, South Korea, Korea Research Environment Open Network, Smithsonian Astrophysical Observatory, Japan Society for the Promotion of Science
Awards: G1383328421, G1384488998, G288881929, G2899887924, Search for free-floating planets by using gravitational microlensing, G3749045598, NSF-BSF: The Frequency and Mass-Ratio Distribution of Super-Earths in KMTNet, G4029007001, 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, G6316152224, Search for cold exoplanets and free-floating planets by near infrared gravitational microlensing observation
OpenAlex ID: W6959979631
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