An Earth-sized Planet around an M5 Dwarf Star at 22 pc
Author:
Hirano TeruyukiORCID, Dai FeiORCID, Livingston John H.ORCID, Grziwa SaschaORCID, Lam Kristine W. F., Kasagi YuiORCID, Narita NorioORCID, Ishikawa Hiroyuki TakoORCID, Miyakawa KoheiORCID, Serrano Luisa M.ORCID, Matsumoto YujiORCID, Kokubo EiichiroORCID, Kimura TadahiroORCID, Ikoma MasahiroORCID, Winn Joshua N.ORCID, Wisniewski John P.ORCID, Harakawa HirokiORCID, Teng Huan-YuORCID, Cochran William D.ORCID, Fukui AkihikoORCID, Gandolfi DavideORCID, Guenther Eike W.ORCID, Hori YasunoriORCID, Ikuta KaiORCID, Kawauchi KiyoeORCID, Knudstrup EmilORCID, Korth JudithORCID, Kotani TakayukiORCID, Krishnamurthy VigneshwaranORCID, Kudo TomoyukiORCID, Kurokawa Takashi, Kuzuhara MasayukiORCID, Luque RafaelORCID, Mori MayukoORCID, Nishikawa JunORCID, Omiya MasashiORCID, Orell-Miquel JaumeORCID, Palle EnricORCID, Persson Carina M.ORCID, Redfield SethORCID, Serabyn Eugene, Smith Alexis M. S.ORCID, Takahashi AoiORCID, Takarada Takuya, Ueda Akitoshi, Van Eylen VincentORCID, Vievard SébastienORCID, Tamura MotohideORCID, Sato Bun’eiORCID
Abstract
Abstract
We report on the discovery of an Earth-sized transiting planet (R
p
= 1.015 ± 0.051 R
⊕) 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
⊕ (M
p
< 7.5 M
⊕ at 95% confidence) for K2-415b. Being one of the lowest-mass stars (≈0.16 M
⊙) 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.
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
1 articles.
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