2023AJ....165..131H

Query : 2023AJ....165..131H

2023AJ....165..131H - Astron. J., 165, 131 (2023/March-0)

An Earth-sized Planet around an M5 Dwarf Star at 22 pc.

HIRANO T., DAI F., LIVINGSTON J.H., GRZIWA S., LAM K.W.F., KASAGI Y., NARITA N., ISHIKAWA H.T., MIYAKAWA K., SERRANO L.M., MATSUMOTO Y., KOKUBO E., KIMURA T., IKOMA M., WINN J.N., WISNIEWSKI J.P., HARAKAWA H., TENG H.-Y., COCHRAN W.D., FUKUI A., GANDOLFI D., GUENTHER E.W., HORI Y., IKUTA K., KAWAUCHI K., KNUDSTRUP E., KORTH J., KOTANI T., KRISHNAMURTHY V., KUDO T., KUROKAWA T., KUZUHARA M., LUQUE R., MORI M., NISHIKAWA J., OMIYA M., ORELL-MIQUEL J., PALLE E., PERSSON C.M., REDFIELD S., SERABYN E., SMITH A.M.S., TAKAHASHI A., TAKARADA T., UEDA A., VAN EYLEN V., VIEVARD S., TAMURA M. and SATO B.

Abstract (from CDS):

We report on the discovery of an Earth-sized transiting planet (Rp = 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⊕ (Mp < 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.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Transit photometry - High angular resolution - High-resolution spectroscopy - Exoplanet formation - Radial velocity

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 G 268-38 PM* 00 44 59.3309137511 -15 16 17.542839990     14.150 13.801 11.19 M4.5V 197 0
2 G 9-40 LP* 08 58 52.3297250887 +21 04 34.200161052   15.477 13.821 13.427   M2V 34 0
3 NAME G 41-26b Pl 09 08 48.8546081084 +11 51 41.116103152           ~ 7 0
4 G 41-26 PM* 09 08 48.8546081084 +11 51 41.116103152   16.4   14.4   dM5.0 20 0
5 LP 791-18 PM* 11 02 45.9546199392 -16 24 22.288196376           M6V 50 0
6 LP 868-19 LM* 19 16 35.5932786007 -25 38 41.926683491     13.630 13.387   M3V 29 0
7 Kepler-42 PM* 19 28 52.5688740811 +44 37 08.989819665   17.8   16.06   M4V 131 1
8 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0

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