K2-137 b: an Earth-sized planet in a 4.3-hour orbit around an M-dwarf

Smith, A. M. S. and Cabrera, J and Csizmadia, S and Dai, F. and Gandolfi, D. and Hirano, T. and Winn, Joshua N. and Albrecht, S. and Alonso, R and Antoniciello, G. and Barragan, O. and Deeg, H and Eigmüller, P and Endl, M. and Erikson, A and Fridlund, M and Fukui, A. and Grziwa, S. and Guenther, E. and Hatzes, A. and Hidalgo, D. and Howard, A. W. and Isaacson, H. and Korth, J. and Kuzuhara, M. and Livingston, J. and Narita, N. and Nespral, D. and Nowak, G. and Palle, E. and Pätzold, M. and Persson, C. M. and Petigura, E. and Prieto-Arranz, J. and Rauer, H and Ribas, I. and Van Eylen, V. (2018) K2-137 b: an Earth-sized planet in a 4.3-hour orbit around an M-dwarf. Monthly Notices of the Royal Astronomical Society, 474 (4), pp. 5523-5533. Oxford University Press. doi: 10.1093/mnras/stx2891. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/474/4/5523/4604789

Abstract

We report the discovery in K2's Campaign 10 of a transiting terrestrial planet in an ultra-short-period orbit around an M3-dwarf. K2-137 b completes an orbit in only 4.3 h, the second shortest orbital period of any known planet, just 4 min longer than that of KOI 1843.03, which also orbits an M-dwarf. Using a combination of archival images, adaptive optics imaging, radial velocity measurements, and light-curve modelling, we show that no plausible eclipsing binary scenario can explain the K2 light curve, and thus confirm the planetary nature of the system. The planet, whose radius we determine to be 0.89 ± 0.09 R⊕, and which must have an iron mass fraction greater than 0.45, orbits a star of mass 0.463 ± 0.052 M⊙ and radius 0.442 ± 0.044 R⊙.

Item URL in elib:

https://elib.dlr.de/126698/

Document Type:

Article

Title:

K2-137 b: an Earth-sized planet in a 4.3-hour orbit around an M-dwarf

Authors:

Authors	Institution or Email of Authors	Author's ORCID iD	ORCID Put Code
Smith, A. M. S.	UNSPECIFIED	https://orcid.org/0000-0002-2386-4341	UNSPECIFIED
Cabrera, J	UNSPECIFIED	https://orcid.org/0000-0001-6653-5487	UNSPECIFIED
Csizmadia, S	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Dai, F.	Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute ofTechnology, Cambridge, MA 02139, USA	UNSPECIFIED	UNSPECIFIED
Gandolfi, D.	Dipartimento di Fisica, Universitadi Torino, via P. Giuria 1, I-10125 Torino, Italy	UNSPECIFIED	UNSPECIFIED
Hirano, T.	Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan	UNSPECIFIED	UNSPECIFIED
Winn, Joshua N.	Department of Astrophysics Sciences, Princeton University, 4 Ivy Lane, Priceton, NJ 08544, USA	UNSPECIFIED	UNSPECIFIED
Albrecht, S.	Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark	UNSPECIFIED	UNSPECIFIED
Alonso, R	Laboratoire d'Astrophysique de Marseille	UNSPECIFIED	UNSPECIFIED
Antoniciello, G.	Dipartimento di Fisica, Università di Torino, via P. Giuria 1, I-10125 Torino, Italy	UNSPECIFIED	UNSPECIFIED
Barragan, O.	Dipartimento di Fisica, Universita degli Studi di Trino, via Pietro Giuria 1, 10125 Torino, Italy	UNSPECIFIED	UNSPECIFIED
Deeg, H	Instituto de Astrofisica de Canarias	UNSPECIFIED	UNSPECIFIED
Eigmüller, P	UNSPECIFIED	https://orcid.org/0000-0003-4096-0594	UNSPECIFIED
Endl, M.	Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA	UNSPECIFIED	UNSPECIFIED
Erikson, A	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Fridlund, M	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Fukui, A.	Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, 719-0232 Okayama,Japan	UNSPECIFIED	UNSPECIFIED
Grziwa, S.	Rheinisches Institut furr Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, Germany	UNSPECIFIED	UNSPECIFIED
Guenther, E.	Thüringer Landessternwarte Tautenburg	UNSPECIFIED	UNSPECIFIED
Hatzes, A.	Thüringer Landessternwarte Tautenburg	UNSPECIFIED	UNSPECIFIED
Hidalgo, D.	Instituto de Astrof´ısica de Canarias, E-38205 La Laguna, Tenerife, Spain	UNSPECIFIED	UNSPECIFIED
Howard, A. W.	Department of Astronomy, California Institute of Technology, Pasadena, CA, USA	UNSPECIFIED	UNSPECIFIED
Isaacson, H.	Astronomy Department, University of California, Berkeley, CA, USA	UNSPECIFIED	UNSPECIFIED
Korth, J.	Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, Germany	UNSPECIFIED	UNSPECIFIED
Kuzuhara, M.	Astrobiology Center, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan	UNSPECIFIED	UNSPECIFIED
Livingston, J.	Department of Astronomy, The University of Tokyo, 7-3-1 Bunkyo-ku, Tokyo 113-0033, Japan	UNSPECIFIED	UNSPECIFIED
Narita, N.	Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan	UNSPECIFIED	UNSPECIFIED
Nespral, D.	Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain \| Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, Spain	UNSPECIFIED	UNSPECIFIED
Nowak, G.	Instituto de Astrofísicade Canarias, 38205 La Laguna, Tenerife, Spain \| Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, Spain	UNSPECIFIED	UNSPECIFIED
Palle, E.	Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain \| Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, Spain	UNSPECIFIED	UNSPECIFIED
Pätzold, M.	Rhenish Institute for Environmental Research, University of Cologne, Cologne, Germany	UNSPECIFIED	UNSPECIFIED
Persson, C. M.	Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, 439 92, Onsala, Sweden	UNSPECIFIED	UNSPECIFIED
Petigura, E.	Geological and Planetary Sciences, Caltech, USA	UNSPECIFIED	UNSPECIFIED
Prieto-Arranz, J.	Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain \| Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, Spain	UNSPECIFIED	UNSPECIFIED
Rauer, H	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Ribas, I.	Institute d´Estudis Espacials de Catalunya and Instituto de Ciencias des Espacio, Barcelona, Spain	UNSPECIFIED	UNSPECIFIED
Van Eylen, V.	Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands	UNSPECIFIED	UNSPECIFIED

Date:

2018

Journal or Publication Title:

Monthly Notices of the Royal Astronomical Society

Refereed publication:

Yes

Open Access:

Gold Open Access:

In SCOPUS:

Yes

In ISI Web of Science:

Yes

Volume:

474

DOI:

10.1093/mnras/stx2891

Page Range:

pp. 5523-5533

Publisher:

Oxford University Press

ISSN:

0035-8711

Status:

Published

Keywords:

planetary systems – planets and satellites: detection – planets and satellites: individual: EPIC 228813918 b

HGF - Research field:

Aeronautics, Space and Transport

HGF - Program:

Space

HGF - Program Themes:

Space Exploration

DLR - Research area:

Raumfahrt

DLR - Program:

R EW - Space Exploration

DLR - Research theme (Project):

R - Projekt COROT Beteiligung (old)

Location:

Berlin-Adlershof

Institutes and Institutions:

Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF

Deposited By:

Schubert, Renate

Deposited On:

04 Mar 2019 12:01

Last Modified:

08 Nov 2023 14:48

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