Detalles de publicación

PP 019021

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

R. Luque (1,2), G. Nowak (1,2), E. Pallé (1,2), F. Dai, A. Kaminski, E. Nagel, D. Hidalgo (1,2), 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 (1,2), P. J. Amado, P. Beck (1,2), J. A. Caballero, J. Cabrera, W. D. Cochran, Sz. Csizmadia, H. Deeg (1,2), 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 (1,2), P. Montañes-Rodríguez (1,2), N. Narita, D. Nespral (1,2), P. Niraula, M. Pätzold, C. M. Persson, J. Prieto-Arranz (1,2), A. Quirrenbach, H. Rauer, S. Redfield, A. Reiners, I. Ribas, and A. M. S. Smith
(1) Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife (2) Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain
We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. K2-292 b is a warm sub-Neptune on a 17-d orbit around a bright (V = 9.9 mag) solar-like G3 V star with a mass and radius of M*=1.00±0.03Ms and R*=1.09±0.03Rs, respectively. We model simultaneously the K2 photometry and CARMENES spectroscopic data and derive a radius of Rp=2.63+0.12−0.10Re and mass of Mp=24.5+4.4−4.4Me, yielding a mean density of rho_p=7.4+1.6−1.5gcm−3, which makes it one of the densest sub-Neptune planets known to date. We also detect a linear trend in radial velocities of HD 119130 (lin_trend=−0.40+0.07−0.07ms−1d−1) that suggests a long-period companion with a minimum mass on the order of 33Me. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.

 
Aceptado para publicación en A&A | Enviado el 2019-02-15 | Proyecto P/301301