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 de Astrofísica 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 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
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 de Astrofísica 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 de Astrofísica de Canarias
Judith Korth
Universität zu Köln
R. Luque
Instituto de Astrofísica de Canarias
Universidad de la Laguna
David Nespral
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Enric Palle
Universidad de la Laguna
Instituto de Astrofísica 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-Gesellschaft
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 484 3 3522-3536Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två missioner
Rymdstyrelsen (174/18), 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