نبذة مختصرة : We report on the discovery of an Earth-sized transiting planet (Rp = 1.015 ± 0.051 Rs) in a P = 4.02 day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc. The planet candidate was first identified by analyzing the light-curve data obtained by the K2 mission, and it is here shown to exist in the most recent data from TESS. Combining the light curves with the data secured by our follow-up observations, including high- resolution imaging and near-infrared spectroscopy with IRD, we rule out false-positive scenarios, finding a low false-positive probability of 2 × 10^-4. Based on IRD's radial velocities of K2-415, which were sparsely taken over three years, we obtain a planet mass of 3.0 ± 2.7 M_earth (M p < 7.5 M_earth at 95% confidence) for K2-415b. Being one of the lowest-mass stars (approximately = 0.16 Msun) known to host an Earth-sized transiting planet, K2-415 will be an interesting target for further follow-up observations, including additional radial velocity monitoring and transit spectroscopy.
Relation: https://elib.dlr.de/195649/1/Hirano_2023_AJ_165_131.pdf; Hirano, Teruyuki und Dai, Fei und Livingston, John H. und Grziwa, Sascha und Lam, Kristine W. F. und Kasagi, Yui und Narita, Norio und Ishikawa, Hiroyuki Tako und Miyakawa, Kohei und Serrano, Luisa M. und Matsumoto, Yuji und Kokubo, Eiichiro und Kimura, Tadahiro und Ikoma, Masahiro und Winn, Joshua N. und Wisniewski, John P. und Harakawa, Hiroki und Teng, Huan-Yu und Cochran, William D. und Fukui, Akihiko und Gandolfi, Davide und Guenther, Eike W. und Hori, Yasunori und Ikuta, Kai und Kawauchi, Kiyoe und Knudstrup, Emil und Korth, Judith und Kotani, Takayuki und Krishnamurthy, Vigneshwaran und Kudo, Tomoyuki und Kurokawa, Takashi und Kuzuhara, Masayuki und Luque, Rafael und Mori, Mayuko und Nishikawa, Jun und Omiya, Masashi und Orell-Miquel, Jaume und Palle, Enric und Persson, Carina M. und Redfield, Seth und Serabyn, Eugene und Smith, Alexis M. S. und Takahashi, Aoi und Takarada, Takuya und Ueda, Akitoshi und Van Eylen, Vincent und Vievard, Sébastien und Tamura, Motohide und Sato, Bun'ei (2023) An Earth-sized Planet around an M5 Dwarf Star at 22 pc. The Astronomical Journal, 165 (3), Seite 131. IOP Publishing. doi:10.3847/1538-3881/acb7e1 . ISSN 0004-6256.
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