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.

planetary systems

techniques: radial velocities

stars: individual: HD 119130

stars: individual: K2-292

techniques: photometric

techniques: high angular resolution


R. Luque

G. Nowak

E. Palle

F. Dai

A. Kaminski

E. Nagel

D. Hidalgo

F. Bauer

M. Lafarga

J. Livingston

O. Barragan

T. Hirano

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

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. G. 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. Montanes Rodriguez

N. Narita

D. Nespral

P. Niraula

M. Pätzold

Carina Persson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

J. Prieto-Arranz

A. Quirrenbach

H. Rauer

S. Redfield

A. Reiners

I Ribas

A. M. S. Smith

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 623 A114

Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects

Swedish National Space Board, 2017-01-01 -- 2022-12-31.

Subject Categories

Astronomy, Astrophysics and Cosmology


Basic sciences



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4/8/2019 1