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.
Satellites: individual: EPIC 249624646
Planets and satellites: individual: K2-290
Planets
Planets and satellites: formation
Planets and satellites: detection
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
Princeton University
Massachusetts Institute of Technology (MIT)
R. Alonso
Instituto de Astrofísica de Canarias
O. Barragán
University of Turin
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 de Astrofísica de Canarias
Norio Narita
University of Tokyo
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
Instituto de Astrofísica de Canarias
G. Nowak
Instituto de Astrofísica de Canarias
J. Prieto-Arranz
Instituto de Astrofísica 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
Instituto de Astrofísica de Canarias
University of La Laguna
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
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 de Astrofísica de Canarias
Judith Korth
University of Cologne
R. Luque
Instituto de Astrofísica de Canarias
University of La Laguna
David Nespral
University of La Laguna
Instituto de Astrofísica de Canarias
Enric Palle
University of La Laguna
Instituto de Astrofísica de Canarias
Martin Pätzold
University of Cologne
Carina Persson
Chalmers, Space, Earth and Environment, Onsala Space Observatory
H. Rauer
German Aerospace Center (DLR)
Technische Universität Berlin
Freie Universität Berlin
Alexis M. S. Smith
German Aerospace Center (DLR)
T. Trifonov
Max Planck Society
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 484 3 3522-3536Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects
Swedish National Space Board (174/18), 2017-01-01 -- 2022-12-31.
Subject Categories
Astronomy, Astrophysics and Cosmology
Other Earth and Related Environmental Sciences
Geology
Roots
Basic sciences
Infrastructure
Onsala Space Observatory
DOI
10.1093/mnras/stz139