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

Research output: Research - peer-reviewJournal article

  • A. M. S. Smith
    A. M. S. SmithInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany 0000-0002-2386-4341
  • J. Cabrera
    J. CabreraInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany anders.erikson@dlr.de
  • Sz Csizmadia
    Sz CsizmadiaInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany anders.erikson@dlr.de
  • F. Dai
    F. DaiDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
  • D. Gandolfi
    D. GandolfiDipartimento di Fisica, Universitá di Torino, via P. Giuria 1, I-10125 Torino, Italy 0000-0003-0563-0493
  • T. Hirano
    T. HiranoDepartment of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
  • J. N. Winn
    J. N. WinnDepartment of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA
  • S. Albrecht
  • R. Alonso
    R. AlonsoDepartamento de Astrofísica, Universidad de La Laguna, (ULL), E-38206 La Laguna, Tenerife, Spain
  • G. Antoniciello
    G. AntonicielloDipartimento di Fisica, Universitá di Torino, via P. Giuria 1, I-10125 Torino, Italy 0000-0003-0563-0493
  • O. Barragán
    O. BarragánDipartimento di Fisica, Universitá di Torino, via P. Giuria 1, I-10125 Torino, Italy 0000-0003-0563-0493
  • H. Deeg
    H. DeegDepartamento de Astrofísica, Universidad de La Laguna, (ULL), E-38206 La Laguna, Tenerife, Spain
  • Ph Eigmüller
    Ph EigmüllerInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany anders.erikson@dlr.de
  • M. Endl
    M. EndlDepartment of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA
  • A. Erikson
    A. EriksonInstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany anders.erikson@dlr.de
  • M. Fridlund
    M. FridlundDepartment of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden
  • A. Fukui
    A. FukuiOkayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, Okayama 719-0232, Japan
  • S. Grziwa
    S. GrziwaRheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany
  • E. W. Guenther
    E. W. GuentherThüringer Landessternwarte, Sternwarte 5, Tautenburg 5, 07778, Tautenburg, Germany
  • A. P. Hatzes
    A. P. HatzesThüringer Landessternwarte, Sternwarte 5, Tautenburg 5, 07778, Tautenburg, Germany
  • D. Hidalgo
    D. HidalgoDepartamento de Astrofísica, Universidad de La Laguna, (ULL), E-38206 La Laguna, Tenerife, Spain
  • A. W. Howard
    A. W. HowardDepartment of Astronomy, California Institute of Technology, 1200 East California Boulevard, MC 249-17, Pasadena, CA 91125, USA
  • H. Isaacson
    H. IsaacsonDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA
  • J. Korth
    J. KorthRheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany
  • M. Kuzuhara
    M. KuzuharaNational Astronomical Observatory of Japan, NINS, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 0000-0001-8511-2981
  • J. Livingston
    J. LivingstonDepartment of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-0033, Tokyo, Japan
  • N. Narita
    N. NaritaDepartment of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-0033, Tokyo, Japan
  • D. Nespral
    D. NespralDepartamento de Astrofísica, Universidad de La Laguna, (ULL), E-38206 La Laguna, Tenerife, Spain
  • G. Nowak
    G. NowakDepartamento de Astrofísica, Universidad de La Laguna, (ULL), E-38206 La Laguna, Tenerife, Spain
  • E. Palle
    E. PalleDepartamento de Astrofísica, Universidad de La Laguna, (ULL), E-38206 La Laguna, Tenerife, Spain
  • M. Pätzold
    M. PätzoldRheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany
  • C. M. Persson
    C. M. PerssonDepartment of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden
  • E. Petigura
    E. PetiguraDepartment of Astronomy and Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
  • J. Prieto-Arranz
    J. Prieto-ArranzDepartamento de Astrofísica, Universidad de La Laguna, (ULL), E-38206 La Laguna, Tenerife, Spain
  • H. Rauer
    H. RauerCenter for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany
  • I. Ribas
    I. RibasInstitut de Ciències de l'Espai (CSIC-IEEC), Carrer de Can Magrans, Campus UAB, E-08193 Bellaterra, Spain
  • V. Van Eylen
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⊙.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume474
Issue number4
Pages (from-to)5523-5533
ISSN0035-8711
DOIs
StatePublished - 1 Mar 2018
Externally publishedYes

    Research areas

  • planets and satellites: detection, planets and satellites: individual: K2-137 b

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