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

Luque, R. ; Nowak, G. ; Pallé, E. ; Dai, F. ; Kaminski, A. ; Nagel, E. ; Hidalgo, D. ; Bauer, F. ; Lafarga, M. and Livingston, J. , et al. (2019) In Astronomy and Astrophysics 623.
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 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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
keywords
Planetary systems, Stars: individual: HD 119130, Stars: individual: K2-292, Techniques: high angular resolution, Techniques: photometric, Techniques: radial velocities
in
Astronomy and Astrophysics
volume
623
article number
A114
publisher
EDP Sciences
external identifiers
  • scopus:85063048019
ISSN
0004-6361
DOI
10.1051/0004-6361/201834952
language
English
LU publication?
no
additional info
Publisher Copyright: © 2019 ESO.
id
bd70b928-4847-4029-b10b-e2b84e56c4c3
date added to LUP
2023-02-02 10:39:42
date last changed
2023-02-21 10:18:24
@article{bd70b928-4847-4029-b10b-e2b84e56c4c3,
  abstract     = {{<p>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<sub>∗</sub> = 1.00 ± 0.03 M<sub>Ȯ</sub> and R<sub>∗</sub> = 1.09 ± 0.03 R<sub>Ȯ</sub>, respectively. We modeled simultaneously the K2 photometry and CARMENES spectroscopic data and derived a radius of R<sub>p</sub>=2.63<sub>-0.10</sub><sup>+0.12</sup> R<sub>Ȯ</sub> and mass of M<sub>p</sub>=24.5<sub>-4.4</sub><sup>+4.4</sup> M<sub>Ȯ</sub>, yielding a mean density of ρ<sub>p</sub>=7.4<sub>-1.5</sub><sup>+1.6</sup> g cm<sup>-3</sup>, 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<sub>RV</sub> =-0.40<sub>-0.07</sub><sup>+0.07</sup> m s<sup>-1</sup> d<sup>-1</sup>) that suggests a long-period companion with a minimum mass on the order of 33 M<sub>Ȯ</sub>. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.</p>}},
  author       = {{Luque, R. and Nowak, G. and Pallé, E. and Dai, F. and Kaminski, A. and Nagel, E. and Hidalgo, D. and Bauer, F. and Lafarga, M. and Livingston, J. and Barragán, O. and Hirano, T. and Fridlund, M. and Gandolfi, D. and Justesen, A. B. and Hjorth, M. and Van Eylen, V. and Winn, J. N. and Esposito, M. and Morales, J. C. and Albrecht, S. and Alonso, R. and Amado, P. J. and Beck, P. and Caballero, J. A. and Cabrera, J. and Cochran, W. D. and Csizmadia, Sz and Deeg, H. and Eigmüller, Ph and Endl, M. and Erikson, A. and Fukui, A. and Grziwa, S. and Guenther, E. W. and Hatzes, A. P. and Knudstrup, E. and Korth, J. and Lam, K. W.F. and Lund, M. N. and Mathur, S. and Montañes-Rodríguez, P. and Narita, N. and Nespral, D. and Niraula, P. and Pätzold, M. and Persson, C. M. and Prieto-Arranz, J. and Quirrenbach, A. and Rauer, H. and Redfield, S. and Reiners, A. and Ribas, I. and Smith, A. M.S.}},
  issn         = {{0004-6361}},
  keywords     = {{Planetary systems; Stars: individual: HD 119130; Stars: individual: K2-292; Techniques: high angular resolution; Techniques: photometric; Techniques: radial velocities}},
  language     = {{eng}},
  month        = {{03}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/201834952}},
  doi          = {{10.1051/0004-6361/201834952}},
  volume       = {{623}},
  year         = {{2019}},
}