K2-290: A warm Jupiter and a mini-Neptune in a triple-star system
Artikel i vetenskaplig tidskrift, 2019

We report the discovery of two transiting planets orbiting K2-290 (EPIC 249624646), a bright (V = 11.11) late F-type star residing in a triple-star system. It was observed during Campaign 15 of the K2 mission, and in order to confirm and characterize the system, follow-up spectroscopy and AO imaging were carried out using the FIES, HARPS, HARPS-N, and IRCS instruments. From AO imaging and Gaia data we identify two M-dwarf companions at a separation of 113 ± 2 and 2467+−177155 au. From radial velocities, K2 photometry, and stellar characterization of the host star, we find the inner planet to be a mini-Neptune with a radius of 3.06 ± 0.16 R and an orbital period of P = 9.2 d. The radius of the mini-Neptune suggests that the planet is located above the radius valley, and with an incident flux of F ∼ 400 F, it lies safely outside the super-Earth desert. The outer warm Jupiter has a mass of 0.774 ± 0.047 MJ and a radius of 1.006 ± 0.050 RJ, and orbits the host star every 48.4 d on an orbit with an eccentricity e < 0.241. Its mild eccentricity and mini-Neptune sibling suggest that the warm Jupiter originates from in situ formation or disc migration.

Satellites: individual: EPIC 249624646

Planets and satellites: individual: K2-290

Planets

Planets and satellites: formation

Planets and satellites: detection

Författare

M. Hjorth

Aarhus Universitet

A.B. Justesen

Aarhus Universitet

T. Hirano

Tokyo Institute of Technology

Simon Albrecht

Aarhus Universitet

D. Gandolfi

Universita degli Studi di Torino

Fei Dai

Princeton University

Massachusetts Institute of Technology (MIT)

R. Alonso

Instituto Astrofisico de Canarias

O. Barragán

Universita degli Studi di Torino

M. Esposito

Thüringer Landessternwarte Tautenburg

M. Kuzuhara

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

K. W.F. Lam

Technische Universität Berlin

J. Livingston

University of Tokyo

P. M. Rodriguez

Instituto Astrofisico de Canarias

Norio Narita

University of Tokyo

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Instituto Astrofisico de Canarias

G. Nowak

Instituto Astrofisico de Canarias

J. Prieto-Arranz

Instituto Astrofisico de Canarias

S. Redfield

Wesleyan University

F. Rodler

European Southern Observatory Santiago

Vincent Van Eylen

Princeton University

J. N. Winn

Princeton University

Giuliano Antoniciello

Universita degli Studi di Torino

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

William D. Cochran

The University of Texas at Austin

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Jerome P. De Leon

University of Tokyo

H. Deeg

Instituto Astrofisico de Canarias

Universidad de la Laguna

P. Eigmüller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Endl

The University of Texas at Austin

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Universiteit Leiden

S. Grziwa

Universität zu Köln

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

P. Heeren

Landessternwarte Heidelberg-Königstuhl

D. Hidalgo

Universidad de la Laguna

Instituto Astrofisico de Canarias

Judith Korth

Universität zu Köln

R. Luque

Instituto Astrofisico de Canarias

Universidad de la Laguna

David Nespral

Universidad de la Laguna

Instituto Astrofisico de Canarias

Enric Palle

Universidad de la Laguna

Instituto Astrofisico de Canarias

Martin Pätzold

Universität zu Köln

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

H. Rauer

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Technische Universität Berlin

Freie Universität Berlin

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

T. Trifonov

Max Planck-institutet

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 484 3 3522-3536

Exoplaneter från rymden - CHEOPS och PLATO

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

Ämneskategorier

Astronomi, astrofysik och kosmologi

Annan geovetenskap och miljövetenskap

Geologi

Fundament

Grundläggande vetenskaper

Infrastruktur

Onsala rymdobservatorium

DOI

10.1093/mnras/stz139

Mer information

Senast uppdaterat

2019-09-10