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Judith Korth



Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292


  • R. Luque
  • G. Nowak
  • E. Pallé
  • F. Dai
  • A. Kaminski
  • E. Nagel
  • D. Hidalgo
  • F. Bauer
  • M. Lafarga
  • J. Livingston
  • O. Barragán
  • T. Hirano
  • M. Fridlund
  • D. Gandolfi
  • A. B. Justesen
  • M. Hjorth
  • V. Van Eylen
  • J. N. Winn
  • M. Esposito
  • J. C. Morales
  • S. Albrecht
  • R. Alonso
  • P. J. Amado
  • P. Beck
  • J. A. Caballero
  • J. Cabrera
  • W. D. Cochran
  • Sz Csizmadia
  • H. Deeg
  • Ph Eigmüller
  • M. Endl
  • A. Erikson
  • A. Fukui
  • S. Grziwa
  • E. W. Guenther
  • A. P. Hatzes
  • E. Knudstrup
  • J. Korth
  • K. W.F. Lam
  • M. N. Lund
  • S. Mathur
  • P. Montañes-Rodríguez
  • N. Narita
  • D. Nespral
  • P. Niraula
  • M. Pätzold
  • C. M. Persson
  • J. Prieto-Arranz
  • A. Quirrenbach
  • H. Rauer
  • S. Redfield
  • A. Reiners
  • I. Ribas
  • A. M.S. Smith

Summary, in English

We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (V = 9.9 mag) solar-like G3 V star with a mass and radius of M = 1.00 ± 0.03 MȮ and R = 1.09 ± 0.03 RȮ, respectively. We modeled simultaneously the K2 photometry and CARMENES spectroscopic data and derived a radius of Rp=2.63-0.10+0.12 RȮ and mass of Mp=24.5-4.4+4.4 MȮ, yielding a mean density of ρp=7.4-1.5+1.6 g cm-3, which makes it one of the densest sub-Neptunian planets known to date. We also detected a linear trend in the radial velocities of K2-292 (γRV =-0.40-0.07+0.07 m s-1 d-1) that suggests a long-period companion with a minimum mass on the order of 33 MȮ. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.

Publishing year





Astronomy and Astrophysics



Document type

Journal article


EDP Sciences


  • Planetary systems
  • Stars: individual: HD 119130
  • Stars: individual: K2-292
  • Techniques: high angular resolution
  • Techniques: photometric
  • Techniques: radial velocities




  • ISSN: 0004-6361