Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292
Artikel i vetenskaplig tidskrift, 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

Författare

R. Luque

Universidad de la Laguna

Instituto Astrofisico de Canarias

G. Nowak

Instituto Astrofisico de Canarias

Universidad de la Laguna

E. Palle

Universidad de la Laguna

Instituto Astrofisico de Canarias

F. Dai

Princeton University

Massachusetts Institute of Technology (MIT)

A. Kaminski

Universität Heidelberg

E. Nagel

Universität Hamburg

D. Hidalgo

Universidad de la Laguna

Instituto Astrofisico de Canarias

F. Bauer

CSIC - Instituto de Astrofísica de Andalucía (IAA)

M. Lafarga

Institut de Ciències de l'Espai (ICE) - CSIC

Institut d'Estudis Espacials de Catalunya (IEEC)

J. Livingston

University of Tokyo

O. Barragan

Universita degli Studi di Torino

T. Hirano

Tokyo Institute of Technology

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

D. Gandolfi

Tokyo Institute of Technology

A.B. Justesen

Aarhus Universitet

M. Hjorth

Aarhus Universitet

V. Van Eylen

Princeton University

J. N. Winn

Princeton University

M. Esposito

Thüringer Landessternwarte Tautenburg

J. C. Morales

Institut de Ciències de l'Espai (ICE) - CSIC

Institut d'Estudis Espacials de Catalunya (IEEC)

S. Albrecht

Aarhus Universitet

R. Alonso

Instituto Astrofisico de Canarias

Universidad de la Laguna

P. J. Amado

CSIC - Instituto de Astrofísica de Andalucía (IAA)

P. G. Beck

Universidad de la Laguna

Instituto Astrofisico de Canarias

J. A. Caballero

Centro de Astrobiología (INTA-CSIC)

J. Cabrera

DLR Space Administration

W. D. Cochran

The University of Texas at Austin

Sz. Csizmadia

DLR Space Administration

H. Deeg

Universidad de 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

Universität zu Köln

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. P. Hatzes

Thüringer Landessternwarte Tautenburg

E. Knudstrup

Aarhus Universitet

J. Korth

Universität zu Köln

K. W.F. Lam

Technische Universität Berlin

M. N. Lund

Aarhus Universitet

S. Mathur

Instituto Astrofisico de Canarias

Universidad de la Laguna

P. Montanes Rodriguez

Instituto Astrofisico de Canarias

Universidad de la Laguna

N. Narita

Tokyo Institute of Technology

National Astronomical Observatory of Japan

D. Nespral

Universidad de la Laguna

Instituto Astrofisico de Canarias

P. Niraula

Massachusetts Institute of Technology (MIT)

M. Pätzold

Universität zu Köln

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

J. Prieto-Arranz

Instituto Astrofisico de Canarias

Universidad de la Laguna

A. Quirrenbach

Universität Heidelberg

H. Rauer

Technische Universität Berlin

Freie Universität Berlin

DLR Space Administration

S. Redfield

Wesleyan University

A. Reiners

Georg-August-Universität Göttingen

I Ribas

Institut d'Estudis Espacials de Catalunya (IEEC)

Institut de Ciències de l'Espai (ICE) - CSIC

A. M. S. Smith

DLR Space Administration

Astronomy and Astrophysics

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

Vol. 623 A114

Exoplaneter från rymden - CHEOPS och PLATO

Rymdstyrelsen, 2017-01-01 -- 2022-12-31.

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1051/0004-6361/201834952

Mer information

Senast uppdaterat

2020-03-18