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.

Författare

T. Hirano

The Graduate University for Advanced Studies (SOKENDAI)

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

Fei Dai

California Institute of Technology (Caltech)

NASA Sagan Fellow

J. Livingston

National Institutes of Natural Sciences

The Graduate University for Advanced Studies (SOKENDAI)

National Astronomical Observatory of Japan

S. Grziwa

Universität zu Köln

K. W.F. Lam

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Yui Kasagi

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

N. Narita

University of Tokyo

Instituto de Astrofísica de Canarias

National Institutes of Natural Sciences

Hiroyuki Tako Ishikawa

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Kohei Miyakawa

National Astronomical Observatory of Japan

L. M. Serrano

Universita degli Studi di Torino

Yuji Matsumoto

National Astronomical Observatory of Japan

Eiichiro Kokubo

National Astronomical Observatory of Japan

Tadahiro Kimura

University of Tokyo

Masahiro Ikoma

National Astronomical Observatory of Japan

University of Tokyo

J. N. Winn

Princeton University

John P. Wisniewski

George Mason University

Hiroki Harakawa

National Astronomical Observatory of Japan

Huan Yu Teng

Tokyo Institute of Technology

W. D. Cochran

The University of Texas at Austin

A. Fukui

Instituto de Astrofísica de Canarias

University of Tokyo

D. Gandolfi

Universita degli Studi di Torino

Eike W. Guenther

Thüringer Landessternwarte Tautenburg

Yasunori Hori

The Graduate University for Advanced Studies (SOKENDAI)

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Kai Ikuta

University of Tokyo

Kiyoe Kawauchi

University of Tokyo

E. Knudstrup

Aarhus Universitet

Judith Korth

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Takayuki Kotani

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

The Graduate University for Advanced Studies (SOKENDAI)

Vigneshwaran Krishnamurthy

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Tomoyuki Kudo

National Astronomical Observatory of Japan

Takashi Kurokawa

Tokyo University of Agriculture and Technology

National Institutes of Natural Sciences

M. Kuzuhara

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

R. Luque

University of Chicago

Mayuko Mori

University of Tokyo

Jun Nishikawa

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

Masashi Omiya

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

J. Orell-Miquel

Instituto de Astrofísica de Canarias

Universidad de la Laguna

E. Palle

Universidad de la Laguna

Instituto de Astrofísica de Canarias

C. M. Persson

S. Redfield

Wesleyan University

E. Serabyn

Alexis M.S. Smith

Aoi Takahashi

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

Takuya Takarada

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

Akitoshi Ueda

National Astronomical Observatory of Japan

Vincent Van Eylen

Sébastien Vievard

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Motohide Tamura

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

University of Tokyo

Bun’ei Sato

Tokyo Institute of Technology

Astronomical Journal

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

Vol. 165 3 131

Ämneskategorier

Subatomär fysik

Astronomi, astrofysik och kosmologi

Geofysik

DOI

10.3847/1538-3881/acb7e1

Mer information

Senast uppdaterat

2023-03-24