KMT-2023-BLG-1866Lb: Microlensing super-Earth around an M dwarf host
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| Format: | Preprint |
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2024
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| author | Han, Cheongho Bond, Ian A. Udalski, Andrzej Lee, Chung-Uk Gould, Andrew Albrow, Michael D. Chung, Sun-Ju Hwang, Kyu-Ha Jung, Youn Kil Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yee, Jennifer C. Yang, Hongjing Zang, Weicheng Cha, Sang-Mok Kim, Doeon Kim, Dong-Jin Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bando, Ken Barry, Richard Bennett, David P. Bhattacharya, Aparna Fujii, Hirosame Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Kirikawa, Rintaro Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Tomoyoshi, Mio Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki Yamashita, Kansuke 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. |
| author_facet | Han, Cheongho Bond, Ian A. Udalski, Andrzej Lee, Chung-Uk Gould, Andrew Albrow, Michael D. Chung, Sun-Ju Hwang, Kyu-Ha Jung, Youn Kil Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yee, Jennifer C. Yang, Hongjing Zang, Weicheng Cha, Sang-Mok Kim, Doeon Kim, Dong-Jin Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bando, Ken Barry, Richard Bennett, David P. Bhattacharya, Aparna Fujii, Hirosame Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Kirikawa, Rintaro Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Tomoyoshi, Mio Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki Yamashita, Kansuke 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. |
| contents | We investigate the nature of the short-term anomaly that appears in the lensing light curve of KMT-2023-BLG-1866. The anomaly was only partly covered due to its short duration, less than a day, coupled with cloudy weather conditions and restricted nighttime duration. Considering intricacy of interpreting partially covered signals, we thoroughly explore all potential degenerate solutions. Through this process, we identify three planetary scenarios that equally well account for the observed anomaly. These scenarios are characterized by the specific planetary parameters: $(s, q)_{\rm inner} = [0.9740 \pm 0.0083, (2.46 \pm 1.07) \times 10^{-5}]$, $(s, q)_{\rm intermediate} = [0.9779 \pm 0.0017, (1.56 \pm 0.25)\times 10^{-5}]$, and $(s, q)_{\rm outer} = [0.9894 \pm 0.0107, (2.31 \pm 1.29)\times 10^{-5}]$, where $s$ and $q$ denote the projected separation (scaled to the Einstein radius) and mass ratio between the planet and its host, respectively. We identify that the ambiguity between the inner and outer solutions stems from the inner-outer degeneracy, while the similarity between the intermediate solution and the others is due to an accidental degeneracy caused by incomplete anomaly coverage. Through Bayesian analysis utilizing the constraints derived from measured lensing observables and blending flux, our estimation indicates that the lens system comprises a very low-mass planet orbiting an early M-type star situated approximately (6.2 -- 6.5)~kpc from Earth in terms of median posterior values for the different solutions. The median mass of the planet host is in the range of (0.48 -- 0.51)~$M_\odot$, and that of the planet's mass spans a range of (2.6 -- 4.0)~$M_{\rm E}$, varying across different solutions. The detection of KMT-2023-BLG-1866Lb signifies the extension of the lensing surveys to very low-mass planets that have been difficult to be detected from earlier surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_07514 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | KMT-2023-BLG-1866Lb: Microlensing super-Earth around an M dwarf host Han, Cheongho Bond, Ian A. Udalski, Andrzej Lee, Chung-Uk Gould, Andrew Albrow, Michael D. Chung, Sun-Ju Hwang, Kyu-Ha Jung, Youn Kil Ryu, Yoon-Hyun Shvartzvald, Yossi Shin, In-Gu Yee, Jennifer C. Yang, Hongjing Zang, Weicheng Cha, Sang-Mok Kim, Doeon Kim, Dong-Jin Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bando, Ken Barry, Richard Bennett, David P. Bhattacharya, Aparna Fujii, Hirosame Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Kirikawa, Rintaro Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Tomoyoshi, Mio Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki Yamashita, Kansuke 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. Earth and Planetary Astrophysics Astrophysics of Galaxies We investigate the nature of the short-term anomaly that appears in the lensing light curve of KMT-2023-BLG-1866. The anomaly was only partly covered due to its short duration, less than a day, coupled with cloudy weather conditions and restricted nighttime duration. Considering intricacy of interpreting partially covered signals, we thoroughly explore all potential degenerate solutions. Through this process, we identify three planetary scenarios that equally well account for the observed anomaly. These scenarios are characterized by the specific planetary parameters: $(s, q)_{\rm inner} = [0.9740 \pm 0.0083, (2.46 \pm 1.07) \times 10^{-5}]$, $(s, q)_{\rm intermediate} = [0.9779 \pm 0.0017, (1.56 \pm 0.25)\times 10^{-5}]$, and $(s, q)_{\rm outer} = [0.9894 \pm 0.0107, (2.31 \pm 1.29)\times 10^{-5}]$, where $s$ and $q$ denote the projected separation (scaled to the Einstein radius) and mass ratio between the planet and its host, respectively. We identify that the ambiguity between the inner and outer solutions stems from the inner-outer degeneracy, while the similarity between the intermediate solution and the others is due to an accidental degeneracy caused by incomplete anomaly coverage. Through Bayesian analysis utilizing the constraints derived from measured lensing observables and blending flux, our estimation indicates that the lens system comprises a very low-mass planet orbiting an early M-type star situated approximately (6.2 -- 6.5)~kpc from Earth in terms of median posterior values for the different solutions. The median mass of the planet host is in the range of (0.48 -- 0.51)~$M_\odot$, and that of the planet's mass spans a range of (2.6 -- 4.0)~$M_{\rm E}$, varying across different solutions. The detection of KMT-2023-BLG-1866Lb signifies the extension of the lensing surveys to very low-mass planets that have been difficult to be detected from earlier surveys. |
| title | KMT-2023-BLG-1866Lb: Microlensing super-Earth around an M dwarf host |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.07514 |