Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292
Journal article, 2019
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.
stars: individual: HD 119130
techniques: high angular resolution
techniques: photometric
techniques: radial velocities
stars: individual: K2-292
planetary systems
Author
R. Luque
Instituto de Astrofísica de Canarias
University of La Laguna
G. Nowak
University of La Laguna
Instituto de Astrofísica de Canarias
E. Palle
University of La Laguna
Instituto de Astrofísica de Canarias
F. Dai
Massachusetts Institute of Technology (MIT)
Princeton University
A. Kaminski
Heidelberg University
E. Nagel
University of Hamburg
D. Hidalgo
Instituto de Astrofísica de Canarias
University of La Laguna
F. Bauer
Institute of Astrophysics of Andalusia (IAA)
M. Lafarga
Institute of Space Sciences (ICE) - CSIC
Institute of Space Studies of Catalonia (IEEC)
J. Livingston
University of Tokyo
O. Barragan
University of Turin
T. Hirano
Tokyo Institute of Technology
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
D. Gandolfi
Tokyo Institute of Technology
A.B. Justesen
Aarhus University
M. Hjorth
Aarhus University
V. Van Eylen
Princeton University
J. N. Winn
Princeton University
M. Esposito
Thüringer Landessternwarte Tautenburg
J. C. Morales
Institute of Space Sciences (ICE) - CSIC
Institute of Space Studies of Catalonia (IEEC)
S. Albrecht
Aarhus University
R. Alonso
University of La Laguna
Instituto de Astrofísica de Canarias
P. J. Amado
Institute of Astrophysics of Andalusia (IAA)
P. G. Beck
Instituto de Astrofísica de Canarias
University of La Laguna
J. A. Caballero
Spanish Astrobiology Center (INTA-CSIC)
J. Cabrera
German Aerospace Center (DLR)
W. D. Cochran
The University of Texas at Austin
Sz. Csizmadia
German Aerospace Center (DLR)
H. Deeg
Instituto de Astrofísica de Canarias
University of La Laguna
Ph. Eigmüller
German Aerospace Center (DLR)
M. Endl
The University of Texas at Austin
A. Erikson
German Aerospace Center (DLR)
A. Fukui
National Institutes of Natural Sciences
S. Grziwa
University of Cologne
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
E. Knudstrup
Aarhus University
Judith Korth
University of Cologne
K. W.F. Lam
Technische Universität Berlin
M. N. Lund
Aarhus University
S. Mathur
University of La Laguna
Instituto de Astrofísica de Canarias
P. Montanes Rodriguez
Instituto de Astrofísica de Canarias
University of La Laguna
N. Narita
National Astronomical Observatory of Japan
Tokyo Institute of Technology
D. Nespral
University of La Laguna
Instituto de Astrofísica de Canarias
P. Niraula
Massachusetts Institute of Technology (MIT)
M. Pätzold
University of Cologne
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
J. Prieto-Arranz
Instituto de Astrofísica de Canarias
University of La Laguna
A. Quirrenbach
Heidelberg University
H. Rauer
Technische Universität Berlin
Freie Universität Berlin
German Aerospace Center (DLR)
S. Redfield
Wesleyan University
A. Reiners
University of Göttingen
I Ribas
Institute of Space Sciences (ICE) - CSIC
Institute of Space Studies of Catalonia (IEEC)
A. M. S. Smith
German Aerospace Center (DLR)
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 623 A114Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects
Swedish National Space Board (174/18), 2017-01-01 -- 2022-12-31.
Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.1051/0004-6361/201834952