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

We present the discovery and characterization of a new transiting planet from Campaign 17 of the <i>Kepler<i/> extended mission <i>K2<i/>. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (<i>V<i/> = 9.9 mag) solar-like G3 V star with a...

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Bibliographic Details
Main Authors: Luque, Rafael (Author) , Kaminski, Adrian (Author) , Quirrenbach, Andreas (Author)
Format: Article (Journal)
Language:English
Published: 14 March 2019
In: Astronomy and astrophysics
Year: 2019, Volume: 623, Pages: A114
ISSN:1432-0746
DOI:10.1051/0004-6361/201834952
Online Access:Verlag, Volltext: https://doi.org/10.1051/0004-6361/201834952
Verlag, Volltext: https:/articles/aa/abs/2019/03/aa34952-18/aa34952-18.html
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Author Notes: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, and A.M.S. Smith
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Summary:We present the discovery and characterization of a new transiting planet from Campaign 17 of the <i>Kepler<i/> extended mission <i>K2<i/>. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (<i>V<i/> = 9.9 mag) solar-like G3 V star with a mass and radius of <i>M<i/><sub>⋆<sub/> = 1.00 ± 0.03 <i>M<i/><sub>⊙<sub/> and <i>R<i/><sub>⋆<sub/> = 1.09 ± 0.03 <i>R<i/><sub>⊙<sub/>, respectively. We modeled simultaneously the <i>K2<i/> photometry and CARMENES spectroscopic data and derived a radius of and mass of , yielding a mean density of , 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 ( ) that suggests a long-period companion with a minimum mass on the order of 33 <i>M<i/><sub>⊕<sub/>. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.
Item Description:Gesehen am 16.04.2019
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/201834952

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