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Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292
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- Luque, R. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Nowak, G. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Palle, E. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Caballero, J. A. (author)
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- (creator_code:org_t)
- 2019-03-14
- 2019
- English.
- In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 623
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: individual: HD 119130
- stars: individual: K2-292
- techniques: high angular resolution
- planetary systems
- techniques: photometric
- techniques: radial velocities
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- art (subject category)
- ref (subject category)
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- Luque, R.
- Nowak, G.
- Palle, E.
- Dai, F.
- Kaminski, A.
- Nagel, E.
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- Hidalgo, D.
- Bauer, F.
- Lafarga, M.
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- Chalmers University of Technology
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