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: K2-292

techniques: photometric

stars: individual: HD 119130

techniques: high angular resolution

planetary systems

techniques: radial velocities

Author

R. Luque

University of La Laguna

Instituto Astrofisico de Canarias

G. Nowak

Instituto Astrofisico de Canarias

University of La Laguna

E. Palle

University of La Laguna

Instituto Astrofisico de Canarias

F. Dai

Princeton University

Massachusetts Institute of Technology (MIT)

A. Kaminski

Heidelberg University

E. Nagel

Universität Hamburg

D. Hidalgo

University of La Laguna

Instituto Astrofisico de Canarias

F. Bauer

CSIC - Instituto de Astrofísica de Andalucía (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, Galactic Astrophysics

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

Instituto Astrofisico de Canarias

University of La Laguna

P. J. Amado

CSIC - Instituto de Astrofísica de Andalucía (IAA)

P. G. Beck

University of La Laguna

Instituto Astrofisico de Canarias

J. A. Caballero

Spanish Astrobiology Center (INTA-CSIC)

J. Cabrera

DLR Space Administration

W. D. Cochran

The University of Texas at Austin

Sz. Csizmadia

DLR Space Administration

H. Deeg

University of La Laguna

Instituto Astrofisico de Canarias

Ph. Eigmüller

DLR Space Administration

M. Endl

The University of Texas at Austin

A. Erikson

DLR Space Administration

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

J. Korth

University of Cologne

K. W.F. Lam

Technische Universität Berlin

M. N. Lund

Aarhus University

S. Mathur

Instituto Astrofisico de Canarias

University of La Laguna

P. Montanes Rodriguez

Instituto Astrofisico de Canarias

University of La Laguna

N. Narita

Tokyo Institute of Technology

National Astronomical Observatory of Japan

D. Nespral

University of La Laguna

Instituto Astrofisico de Canarias

P. Niraula

Massachusetts Institute of Technology (MIT)

M. Pätzold

University of Cologne

Carina Persson

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

J. Prieto-Arranz

Instituto Astrofisico de Canarias

University of La Laguna

A. Quirrenbach

Heidelberg University

H. Rauer

Technische Universität Berlin

Freie Universität Berlin

DLR Space Administration

S. Redfield

Wesleyan University

A. Reiners

University of Göttingen

I Ribas

Institute of Space Studies of Catalonia (IEEC)

Institute of Space Sciences (ICE) - CSIC

A. M. S. Smith

DLR Space Administration

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

Roots

Basic sciences

DOI

10.1051/0004-6361/201834952

More information

Latest update

3/18/2020