MOA-2022-BLG-249Lb: Nearby microlensing super-Earth planet detected from high-cadence surveys

Cheongho Han, Andrew Gould, Youn Kil Jung, Ian A. Bond, Weicheng Zang, Sun-Ju Chung, Michael D. Albrow, Kyu-Ha Hwang, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Hongjing Yang, Jennifer C. Yee, Sang-Mok Cha, Doeon Kim, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Shude Mao, Wei Zhu, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Hirosame Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Naoki Koshimoto, Yutaka Matsubara, Sho Matsumoto, Shota Miyazaki, Yasushi Muraki, Arisa Okamura, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Taiga Toda, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita

doi:10.1051/0004-6361/202346166

<jats:p><jats:italic>Aims.</jats:italic> We investigate the data collected by the high-cadence microlensing surveys during the 2022 season in search of planetary signals appearing in the light curves of microlensing events. From this search, we find that the lensing event MOA-2022-BLG-249 exhibits a brief positive anomaly that lasted for about one day, with a maximum deviation of ~0.2 mag from a single-source, single-lens model.</jats:p> <jats:p><jats:italic>Methods.</jats:italic> We analyzed the light curve under the two interpretations of the anomaly: one originated by a low-mass companion to the lens (planetary model) and the other originated by a faint companion to the source (binary-source model).</jats:p> <jats:p><jats:italic>Results.</jats:italic> We find that the anomaly is better explained by the planetary model than the binary-source model. We identified two solutions rooted in the inner-outer degeneracy and for both of them, the estimated planet-to-host mass ratio, <jats:italic>q ~</jats:italic> 8 × 10<jats:sup>−5</jats:sup>, is very small. With the constraints provided by the microlens parallax and the lower limit on the Einstein radius, as well as the blend-flux constraint, we find that the lens is a planetary system, in which a super-Earth planet, with a mass of (4.83 ± 1.44) <jats:italic>Μ</jats:italic><jats:sub>⊕</jats:sub>, orbits a low-mass host star, with a mass of (0.18 ± 0.05) <jats:italic>M</jats:italic><jats:sub>⊙</jats:sub>, lying in the Galactic disk at a distance of (2.00 ± 0.42) kpc. The planet detection demonstrates the elevated microlensing sensitivity of the current high-cadence lensing surveys to low-mass planets.</jats:p>

MOA-2022-BLG-249Lb: Nearby microlensing super-Earth planet detected from high-cadence surveys

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MOA-2022-BLG-249Lb: Nearby microlensing super-Earth planet detected from high-cadence surveys

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収録刊行物

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