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. MoralesS. 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

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


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.

Original languageEnglish (US)
Article numberA114
JournalAstronomy and Astrophysics
StatePublished - Mar 1 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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


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