K2-141 b A 5-M-circle plus super-Earth transiting a K7V star every 6.7 h

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    O. Barragan, Univ Torino, University of Turin, Dipartimento Fis, D. Gandolfi, Univ Torino, University of Turin, Dipartimento Fis, F. Dai, Princeton Univ, Princeton University, Dept Astrophys Sci, J. Livingston, Univ Tokyo, University of Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, C. M. Persson, Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, T. Hirano, Tokyo Inst Technol, Tokyo Institute of Technology, Dept Earth & Planetary Sci, Meguro Ku, N. Narita, Natl Astron Observ Japan, National Astronomical Observatory of Japan, National Institutes of Natural Sciences (NINS) - Japan, Okayama Astrophys Observ, Sz. Csizmadia, German Aerosp Ctr, Inst Planetary Res, J. N. Winn, Princeton Univ, Princeton University, Dept Astrophys Sci, D. Nespral, Instituto de Astrofísica de Canarias, J. Prieto-Arranz, Instituto de Astrofísica de Canarias, A. M. S. Smith, German Aerosp Ctr, Inst Planetary Res, G. Nowak, Instituto de Astrofísica de Canarias,
  • S. Albrecht
  • G. Antoniciello, Univ Torino, University of Turin, Dipartimento Fis,
  • A. Bo Justesen
  • J. Cabrera, German Aerosp Ctr, Inst Planetary Res, W. D. Cochran, Univ Texas Austin, University of Texas Austin, McDonald Observ, H. Deeg, Instituto de Astrofísica de Canarias, Ph. Eigmuller, German Aerosp Ctr, Inst Planetary Res, M. Endl, Univ Texas Austin, University of Texas Austin, McDonald Observ, A. Erikson, German Aerosp Ctr, Inst Planetary Res, M. Fridlund, Leiden Univ, Leiden University, Leiden Observ, A. Fukui, Natl Astron Observ Japan, National Astronomical Observatory of Japan, National Institutes of Natural Sciences (NINS) - Japan, Okayama Astrophys Observ, S. Grziwa, Univ Cologne, University of Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch, E. Guenther, Thuringer Landessternwarte Tautenburg TLS, A. P. Hatzes, Thuringer Landessternwarte Tautenburg TLS, D. Hidalgo, Instituto de Astrofísica de Canarias, M. C. Johnson, Ohio State Univ, Ohio State University, Dept Astron, McPherson Lab, J. Korth, Univ Cologne, University of Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch, E. Palle, Instituto de Astrofísica de Canarias, M. Patzold, Univ Cologne, University of Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch, H. Rauer, TU Berlin, Technical University of Berlin, Ctr Astron & Astrophys, Y. Tanaka, Univ Tokyo, University of Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, V. Van Eylen, Leiden Univ, Leiden University, Leiden Observ

We report on the discovery of K2-141 b (EPIC 246393474 b), an ultra-short-period super-Earth on a 6.7 h orbit transiting an active K7V star based on data from K2 campaign 12. We confirmed the planet's existence and measured its mass with a series of follow-up observations: seeing-limited MuSCAT imaging, NESSI high-resolution speckle observations, and FIES and HARPS high-precision radial-velocity monitoring. K2-141 b has a mass of 5.31 +/- 0.46 M-circle plus and radius of 1.54(-0.09)(+0.10), yielding a mean density of 8.00(-1.45)(+1.83) g cm(-3) and suggesting a rocky-iron composition. Models indicate that iron cannot exceed similar to 70% of the total mass. With an orbital period of only 6.7 h, K2-141 b is the shortest-period planet known to date with a precisely determined mass.

Original languageEnglish
Article number95
JournalAstronomy & Astrophysics
Volume612
Number of pages11
ISSN1432-0746
DOIs
StatePublished - 4 May 2018

    Research areas

  • planetary systems, planets and satellites: individual: EPIC 246393474 b, stars: fundamental parameters, stars: individual: EPIC 246393474, techniques: photometric, techniques: radial velocities, SIZED PLANET, COMPANION, SEARCH, SYSTEM, MASSES, DWARF, ORBIT

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