KMT-2021-BLG-0912Lb: a microlensing super Earth around a K-type star

Article

Han, Cheongho, Bond, Ian A., Yee, Jennifer C., Zang, Weicheng, Albrow, Michael D., Chung, Sun-Ju, Gould, Andrew P., Hwang, Kyu-Ha, Jung, Youn Kil, Kim, Doeon, Lee, Chung-Uk, Ryu, Yoon-Hyun, Shin, In-Gu, Shvartzvald, Yossi, Cha, Sang-Mok, Kim, Dong-Jin, Kim, Seung-Lee, Lee, Dong-Joo, Lee, Yongseok, ..., Yang, Hongjing. 2022. "KMT-2021-BLG-0912Lb: a microlensing super Earth around a K-type star." Astronomy and Astrophysics: a European journal. 658. https://doi.org/10.1051/0004-6361/202142495
Article Title

KMT-2021-BLG-0912Lb: a microlensing super Earth around a K-type star

ERA Journal ID1050
Article CategoryArticle
AuthorsHan, Cheongho, Bond, Ian A., Yee, Jennifer C., Zang, Weicheng, Albrow, Michael D., Chung, Sun-Ju, Gould, Andrew P., Hwang, Kyu-Ha, Jung, Youn Kil, Kim, Doeon, Lee, Chung-Uk, Ryu, Yoon-Hyun, Shin, In-Gu, Shvartzvald, Yossi, Cha, Sang-Mok, Kim, Dong-Jin, Kim, Seung-Lee, Lee, Dong-Joo, Lee, Yongseok, Park, Byeong-Gon, Pogge, Richard W., Abe, Fumio, Barry, Richard, Bennett, David P., Bhattacharya, Aparna, Hirao, Yuki, Fujii, Hirosane, Fukui, Akihiko, Itow, Yoshitaka, Kirikawa, Rintaro, Kondo, Iona, Koshimoto, Naoki, Matsubara, Yutaka, Matsumoto, Sho, Muraki, Yasushi, Miyazaki, Shota, Ranc, Clément, Okamura, Arisa, Rattenbury, Nicholas J., Satoh, Yuki, Sumi, Takahiro, Suzuki, Daisuke, Silva, Stela Ishitani, Toda, Taiga, Tristram, Paul J., Yama, Hibiki, Yonehara, Atsunori, Cooper, Tony, Dimitrov, Plamen, Dong, Subo, Drummond, John, Green, Jonathan, Hennerley, Steve, Liu, Zhuokai, Mao, Shude, Maoz, Dan, Penny, Matthew and Yang, Hongjing
Journal TitleAstronomy and Astrophysics: a European journal
Journal Citation658
Article NumberA94
Number of Pages11
Year2022
PublisherEDP Sciences
Place of PublicationFrance
ISSN0004-6361
1432-0746
Digital Object Identifier (DOI)https://doi.org/10.1051/0004-6361/202142495
Web Address (URL)https://www.aanda.org/articles/aa/full_html/2022/02/aa42495-21/aa42495-21.html
Abstract

Aims. The light curve of the microlensing event KMT-2021-BLG-0912 exhibits a very short anomaly relative to a single-lens single-source form. We investigate the light curve for the purpose of identifying the origin of the anomaly.

Methods. We model the light curve under various interpretations. From this, we find four solutions, in which three solutions are found under the assumption that the lens is composed of two masses (2L1S models), and the other solution is found under the assumption that the source is comprised of binary stars (1L2S model). The 1L2S model is ruled out based on the contradiction that the faint source companion is bigger than its primary, and one of the 2L1S solutions is excluded from the combination of the poorer fit, blending constraint, and lower overall probability, leaving two surviving solutions with the planet/host mass ratios of q 2.8 × 10-5 and 1.1 × 10-5. A subtle central deviation supports the possibility of a tertiary lens component, either a binary companion to the host with a very large or small separation, or a second planet lying near the Einstein ring, but it is difficult to claim a secure detection due to the marginal improvement of the fit, lack of consistency among different data sets, and difficulty in uniquely specifying the nature of the tertiary component.

Results. With the observables of the event, it is estimated that the masses of the planet and host are (6.9 M, 0.75 M) according to one solution and~(2.8 M, 0.80 M) according to the other, indicating that the planet is a super Earth around a K-type star, regardless of the solution. The fact that 16 (including the one reported in this work) out of 19 microlensing planets with M10 M were detected during the last 6 yr nicely demonstrates the importance of high-cadence global surveys in detecting very low-mass planets.

Keywordsplanets and satellites: detection; gravitational lensing: micro
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Public Notes

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Byline AffiliationsChungbuk National University, Korea
Massey University, New Zealand
Center for Astrophysics Harvard and Smithsonian, United States
Tsinghua University, China
University of Canterbury, New Zealand
Korea Astronomy and Space Science Institute, Korea
Max Planck Institute for Astronomy, Germany
Ohio State University, United States
Weizmann Institute of Science, Israel
Kyung Hee University, Korea
Korea University of Science and Technology, Korea
Nagoya University, Japan
NASA Goddard Space Flight Center, United States
University of Maryland, United States
Osaka University, Japan
University of Tokyo, Japan
Institute of Astrophysics of the Canary Islands, Spain
National Astronomical Observatory of Japan, Japan
University of Auckland, New Zealand
Japan Aerospace Exploration Agency, Japan
Catholic University of America, United States
Kumeu Observatory, New Zealand
Peking University, China
Centre for Astrophysics
Possum Observatory, New Zealand
Chinese Academy of Sciences, China
Tel Aviv University, Israel
Louisiana State University, United States
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The Discovery and Mass Measurement of a New Ultra-short-period Planet: K2-131b
Dai, Fei, Winn, Joshua N., Gandolfi, Davide, Wang, Sharon X., Teske, Johanna K., Burt, Jennifer, Albrecht, Simon, Barragan, Oscar, Cochran, William D., Endl, Michael, Fridlund, Malcolm, Hatzes, Artie P., Hirano, Teruyuki, Hirsch, Lea A., Johnson, Marshall C., Justesen, Anders Bo, Livingston, John, Persson, Carina M., Prieto-Arranz, Jorge, ..., Wittenmyer, Robert A.. 2017. "The Discovery and Mass Measurement of a New Ultra-short-period Planet: K2-131b." The Astronomical Journal. 154 (6), pp. 1-17. https://doi.org/10.3847/1538-3881/aa9065
On the RZ Draconis substellar circumbinary companions: stability study of the proposed substellar circumbinary system
Hinse, Tobias C., Horner, Jonathan, Lee, Jae Woo, Wittenmyer, Robert A., Lee, Chung-Uk, Park, Jang-Ho and Marshall, Jonathan P.. 2014. "On the RZ Draconis substellar circumbinary companions: stability study of the proposed substellar circumbinary system." Astronomy and Astrophysics: a European journal. 565, p. A104. https://doi.org/10.1051/0004-6361/201423799
Epidemiological analysis of health situation development in Europe and its causes until 1990
Zatonski, Witold A., Manczuk, Marta, Sulkowska, Urszula, Didkowska, Joanna, Wojciechowska, Urszula, Tarkowski, Wojciech, Przewozniak, Krzysztof, Gumkowski, Jakub, Koncewicz, Kinga, Boffetta, Paolo, Campos, Hannia, LaVecchia, Carlo, Powles, John, Rehm, Jurgen, Willet, Walter, Negri, Eva, Aaro, Leif, Boyle, Peter, Gilmore, Anna, ..., Taylor, Beniamin. 2011. "Epidemiological analysis of health situation development in Europe and its causes until 1990." Annals of Agricultural and Environmental Medicine. 18 (2), pp. 194-202.