K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission
Artikel i vetenskaplig tidskrift, 2019
We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V = 12.6 mag, metal-poor ([Fe/H] = -0.65 ± 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V = 12.6 mag G6V ([Fe/H] = + 0.10 ± 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of Mp = 11.3 ± 1.9 M_Earth and a radius of Rp = 2.2 ± 0.1 R_Earth, yielding a mean density of ρp = 5.6 ± 1.9 g cm-3, suggesting a rocky composition. Given its radius, K2-180b is above the region of the so-called `planetary radius gap'. K2-180b is in addition not only one of the densest mini-Neptune-sized planets, but also one of the few mini-Neptune-sized planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.
planets and satellites: fundamental parameters
stars: individual: K2-180
stars: individual: K2-140
stars: fundamental parameters
techniques: photometric
techniques: radial velocities
Författare
J. Korth
Universität zu Köln
Sz. Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
D. Gandolfi
Universita degli Studi di Torino
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
M. Pätzold
Universität zu Köln
T. Hirano
Tokyo Institute of Technology
J. Livingston
Tokyo Institute of Technology
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
H. J. Deeg
Universidad de la Laguna
A.B. Justesen
Aarhus Universitet
O. Barragan
Universita degli Studi di Torino
S. Grziwa
Universität zu Köln
M. Endl
The University of Texas at Austin
R. Tronsgaard
Nordic Optical Telescope
F. Dai
Massachusetts Institute of Technology (MIT)
W. D. Cochran
The University of Texas at Austin
S. Albrecht
Aarhus Universitet
R. Alonso
Universidad de la Laguna
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
P.W. Cauley
Wesleyan University
F. Cusano
Istituto nazionale di astrofisica (INAF)
Ph Eigmüller
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Esposito
Thüringer Landessternwarte Tautenburg
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
D. Hidalgo
Universidad de la Laguna
M. Kuzuhara
National Institutes of Natural Sciences
P. Montañes
Universidad de la Laguna
N.R. Napolitano
Istituto nazionale di astrofisica (INAF)
N. Narita
National Institutes of Natural Sciences
University of Tokyo
Universidad de la Laguna
P. Niraula
Wesleyan University
D. Nespral
Universidad de la Laguna
G. Nowak
Universidad de la Laguna
E. Palle
Universidad de la Laguna
C.E. Petrillo
Rijksuniversiteit Groningen
S. Redfield
Wesleyan University
J. Prieto-Arranz
Universidad de la Laguna
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Technische Universität Berlin
Freie Universität Berlin
A. M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
C. Tortora
Rijksuniversiteit Groningen
V. Van Eylen
Universiteit Leiden
J. N. Winn
Princeton University
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 482 2 1807-1823Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två missioner
Rymdstyrelsen (174/18), 2017-01-01 -- 2022-12-31.
Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
DOI
10.1093/mnras/sty2760