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Judith Korth



K2-141 b : A 5- M super-Earth transiting a K7 v star every 6.7 h


  • O. Barragán
  • D. Gandolfi
  • F. Dai
  • J. Livingston
  • C. M. Persson
  • T. Hirano
  • N. Narita
  • Sz Csizmadia
  • J. N. Winn
  • D. Nespral
  • J. Prieto-Arranz
  • A. M.S. Smith
  • G. Nowak
  • S. Albrecht
  • G. Antoniciello
  • A. Bo Justesen
  • J. Cabrera
  • W. D. Cochran
  • H. Deeg
  • Ph Eigmuller
  • M. Endl
  • A. Erikson
  • M. Fridlund
  • A. Fukui
  • S. Grziwa
  • E. Guenther
  • A. P. Hatzes
  • D. Hidalgo
  • M. C. Johnson
  • J. Korth
  • E. Palle
  • M. Patzold
  • H. Rauer
  • Y. Tanaka
  • V. Van Eylen

Summary, in English

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 K7 V 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 and radius of 1.54-0.09+0.10 R, 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 ∼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.

Publishing year





Astronomy and Astrophysics



Document type

Journal article


EDP Sciences


  • Planetary systems
  • Planets and satellites: individual: EPIC 246393474 b
  • Stars: fundamental parameters
  • Stars: individual: EPIC 246393474
  • Techniques: photometric
  • Techniques: radial velocities




  • ISSN: 0004-6361