An Earth-sized Planet around an M5 Dwarf Star at 22 pc
Artikel i vetenskaplig tidskrift, 2023

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.
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Publicerad i

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 165 Nummer/häfte 3 art. nr 131

Kategorisering

Ämneskategorier (SSIF 2011)

Subatomär fysik

Astronomi, astrofysik och kosmologi

Geofysik

Identifikatorer

DOI

10.3847/1538-3881/acb7e1

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Senast uppdaterat

2025-03-10