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Title: Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292★
Authors: Luque, R.
Nowak, G.
Pallé, E.
Dai, F.
Kaminski, A.
Nagel, E.
Hidalgo, D.
Bauer, F. F.
Lafarga, M.
Livingston, J.
Barragán, O.
Hirano, T.
Fridlund, M.
Gandolfi, D.
Justesen, A. B.
Hjorth, M.
Van Eylen, V.
Winn, J. N.
Esposito, M.
Morales, J. C.
Albrecht, S.
Alonso, R.
Amado, P. J.
Beck, P.
Caballero, J. A.
Cabrera, J.
Cochran, W. D.
Csizmadia, Sz.
Deeg, H.
Eigmuller, Ph.
Endl, M.
Erikson, A.
Fukui, A.
Grziwa, S.
Guenther, E. W.
Hatzes, A. P.
Knudstrup, E.
Korth, J.
Lam, K. W. F.
Lund, M. N.
Mathur, S.
Montañés Rodríguez, P.
Narita, N.
Nespral, D.
Niraula, P.
Pätzold, M.
Persson, C. M.
Prieto Arranz, J.
Quirrenbach, A.
Rauer, H.
Redfield, S.
Reiners, A.
Ribas, I.
Smith, A. M. S.
Keywords: Planetary systems;Techniques: photometric;Techniques: radial velocities;Techniques: high angular resolution;Stars: individual: HD 119130;Stars: individual: K2-292
Issue Date: 14-Mar-2019
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/201834952
Published version:
Citation: Astronomy and Astrophysics 623: A114(2019)
Abstract: 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 M⊙ and R⋆ = 1.09 ± 0.03 R⊙, respectively. We modeled simultaneously the K2 photometry and CARMENES spectroscopic data and derived a radius of Rp=2.63−0.10+0.12 R⊕ and mass of Mp=24.5−4.4+4.4 M⊕, 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 (γ˙RV = −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 M⊕. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.
Description: The light curve is only available at the CDS via anonymous ftp to ( or via
E-ISSN: 1432-0746
ISSN: 0004-6361
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