K2-264: a transiting multiplanet system in the Praesepe open cluster
Artikel i vetenskaplig tidskrift, 2019
Planet host stars with well-constrained ages provide a rare window to the time domain of planet formation and evolution. The NASA K2 mission has enabled the discovery of the vast majority of known planets transiting stars in clusters, providing a valuable sample of planets with known ages and radii. We present the discovery of two planets transiting K2-264, an M2 dwarf in the intermediate age (600-800 Myr) Praesepe open cluster (also known as the Beehive Cluster, M44, or NGC 2632), which was observed by K2 during Campaign 16. The planets have orbital periods of 5.8 and 19.7 d, and radii of 2.2 ± 0.2 and 2.7 ± 0.2R⊕, respectively, and their equilibrium temperatures are 496 ± 10 and 331 ± 7 K, making this a system of two warm sub-Neptunes. When placed in the context of known planets orbiting field stars of similar mass to K2-264, these planets do not appear to have significantly inflated radii, as has previously been noted for some cluster planets. As the second known system of multiple planets transiting a star in a cluster, K2-264 should be valuable for testing theories of photoevaporation in systems of multiple planets. Follow-up observations with current near-infrared (NIR) spectrographs could yield planet mass measurements, which would provide information about the mean densities and compositions of small planets soon after photoevaporation is expected to have finished. Follow-up NIR transit observations using Spitzer or large ground-based telescopes could yield improved radius estimates, further enhancing the characterization of these interesting planets.
techniques: photometric
planets and satellites: detection
techniques: high angular resolution
Författare
J. Livingston
JSPS
University of Tokyo
F. Dai
Massachusetts Institute of Technology (MIT)
Princeton University
T. Hirano
Tokyo Institute of Technology
D. Gandolfi
Universita degli Studi di Torino
A. A. Trani
University of Tokyo
JSPS
G. Nowak
Instituto de Astrofísica de Canarias
Universidad de la Laguna
W. D. Cochran
University of Texas
M. Endl
University of Texas
S. Albrecht
Aarhus Universitet
O. Barragan
Universita degli Studi di Torino
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Sz. Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. P. de Leon
University of Tokyo
H. Deeg
Instituto de Astrofísica de Canarias
Universidad de la Laguna
Ph Eigmüller
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Technische Universität Berlin
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Malcolm Fridlund
Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
A. Fukui
Instituto de Astrofísica de Canarias
National Astronomical Observatory of Japan
S. Grziwa
Universität zu Köln
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
Judith Korth
Universität zu Köln
M. Kuzuhara
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
P. Montañes
Instituto de Astrofísica de Canarias
Universidad de la Laguna
N. Narita
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
Instituto de Astrofísica de Canarias
University of Tokyo
D. Nespral
Universidad de la Laguna
Instituto de Astrofísica de Canarias
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
M. Pätzold
Universität zu Köln
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
J. Prieto-Arranz
Instituto de Astrofísica de Canarias
Universidad de la Laguna
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Freie Universität Berlin
Technische Universität Berlin
M. Tamura
University of Tokyo
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
V. Van Eylen
Universiteit Leiden
J. N. Winn
Princeton University
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 484 1 8-18Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två missioner
Rymdstyrelsen (174/18), 2017-01-01 -- 2022-12-31.
Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
Infrastruktur
Onsala rymdobservatorium
DOI
10.1093/mnras/sty3464