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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:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Smith, A. M. S.alexis.smith (at) dlr.deUNSPECIFIED
Cabrera, Jjuan.cabrera (at) dlr.deUNSPECIFIED
Csizmadia, Sszilard.csizmadia (at) dlr.deUNSPECIFIED
Dai, F.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute ofTechnology, Cambridge, MA 02139, USAUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universitadi Torino, via P. Giuria 1, I-10125 Torino, ItalyUNSPECIFIED
Hirano, T.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, JapanUNSPECIFIED
Winn, Joshua N.Department of Astrophysics Sciences, Princeton University, 4 Ivy Lane, Priceton, NJ 08544, USAUNSPECIFIED
Albrecht, S.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Alonso, RLaboratoire d'Astrophysique de MarseilleUNSPECIFIED
Antoniciello, G.Dipartimento di Fisica, Università di Torino, via P. Giuria 1, I-10125 Torino, ItalyUNSPECIFIED
Barragan, O.Dipartimento di Fisica, Universita degli Studi di Trino, via Pietro Giuria 1, 10125 Torino, ItalyUNSPECIFIED
Deeg, HInstituto de Astrofisica de CanariasUNSPECIFIED
Eigmüller, Pphilipp.eigmueller (at) dlr.deUNSPECIFIED
Endl, M.Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAUNSPECIFIED
Erikson, Aanders.erikson (at) dlr.deUNSPECIFIED
Fridlund, Mmalcolm.fridlund (at) dlr.deUNSPECIFIED
Fukui, A.Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, 719-0232 Okayama,JapanUNSPECIFIED
Grziwa, S.Rheinisches Institut furr Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, GermanyUNSPECIFIED
Guenther, E.Thüringer Landessternwarte TautenburgUNSPECIFIED
Hatzes, A.Thüringer Landessternwarte TautenburgUNSPECIFIED
Hidalgo, D.Instituto de Astrof´ısica de Canarias, E-38205 La Laguna, Tenerife, SpainUNSPECIFIED
Howard, A. W.Department of Astronomy, California Institute of Technology, Pasadena, CA, USAUNSPECIFIED
Isaacson, H.Astronomy Department, University of California, Berkeley, CA, USAUNSPECIFIED
Korth, J.Rheinisches Institut fuer Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, GermanyUNSPECIFIED
Kuzuhara, M.Astrobiology Center, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, JapanUNSPECIFIED
Livingston, J.Department of Astronomy, The University of Tokyo, 7-3-1 Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Narita, N.Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Nespral, D.Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain | Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, SpainUNSPECIFIED
Nowak, G.Instituto de Astrofísicade Canarias, 38205 La Laguna, Tenerife, Spain | Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, SpainUNSPECIFIED
Palle, E.Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain | Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, SpainUNSPECIFIED
Pätzold, M.Rhenish Institute for Environmental Research, University of Cologne, Cologne, GermanyUNSPECIFIED
Persson, C. M.Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, 439 92, Onsala, SwedenUNSPECIFIED
Petigura, E.Geological and Planetary Sciences, Caltech, USAUNSPECIFIED
Prieto-Arranz, J.Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain | Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, SpainUNSPECIFIED
Rauer, Hheike.rauer (at) dlr.deUNSPECIFIED
Ribas, I.Institute d´Estudis Espacials de Catalunya and Instituto de Ciencias des Espacio, Barcelona, SpainUNSPECIFIED
Van Eylen, V.Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The NetherlandsUNSPECIFIED
Date:2018
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
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 Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt COROT Beteiligung
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:06 Sep 2019 15:17

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