K2-290: A warm Jupiter and a mini-Neptune in a triple-star system
Journal article, 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.

Planets and satellites: formation

Planets

Planets and satellites: individual: K2-290

Planets and satellites: detection

Satellites: individual: EPIC 249624646

Author

M. Hjorth

Aarhus University

A.B. Justesen

Aarhus University

T. Hirano

Tokyo Institute of Technology

Simon Albrecht

Aarhus University

D. Gandolfi

University of Turin

Fei Dai

Massachusetts Institute of Technology (MIT)

Princeton University

R. Alonso

Instituto Astrofisico de Canarias

O. Barragán

University of Turin

M. Esposito

Thüringer Landessternwarte Tautenburg

M. Kuzuhara

National Institutes of Natural Sciences - 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

National Institutes of Natural Sciences

University of Tokyo

Instituto Astrofisico de Canarias

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

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

University of Turin

J. Cabrera

German Aerospace Center (DLR)

William D. Cochran

The University of Texas at Austin

Szilard Csizmadia

German Aerospace Center (DLR)

Jerome P. De Leon

University of Tokyo

H. Deeg

University of La Laguna

Instituto Astrofisico de Canarias

P. Eigmüller

German Aerospace Center (DLR)

M. Endl

The University of Texas at Austin

Anders Erikson

German Aerospace Center (DLR)

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Leiden University

Other publications Research

S. Grziwa

University of Cologne

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

P. Heeren

Heidelberg-Königstuhl State Observatory

D. Hidalgo

University of La Laguna

Instituto Astrofisico de Canarias

Judith Korth

University of Cologne

R. Luque

University of La Laguna

Instituto Astrofisico de Canarias

David Nespral

Instituto Astrofisico de Canarias

University of La Laguna

Enric Palle

Instituto Astrofisico de Canarias

University of La Laguna

Martin Pätzold

University of Cologne

Carina Persson

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Other publications Research

H. Rauer

Technische Universität Berlin

German Aerospace Center (DLR)

Freie Universität Berlin

Alexis M. S. Smith

German Aerospace Center (DLR)

T. Trifonov

Max Planck Institute

Monthly Notices of the Royal Astronomical Society

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

Vol. 484 3 3522-3536

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

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

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Onsala Space Observatory

DOI

10.1093/mnras/stz139

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7/17/2019

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