K2-141 b: A 5-M⊕ super-Earth transiting a K7 V star every 6.7 hours
Artikel i vetenskaplig tidskrift, 2018
We report on the discovery of K2-141 b (EPIC 246393474 b), an ultra-short-period super-Earth on a 6.7 h orbit transiting an active K7 V star based on data from K2 campaign 12. We confirmed the planet's existence and measured its mass with a series of follow-up observations: seeing-limited Muscat imaging, NESSI high-resolution speckle observations, and FIES and HARPS high-precision radial-velocity monitoring. K2-141 b has a mass of 5.31 ± 0.46 M ⊗ and radius of 1.54 -0.09 +0.10 R ⊗ , yielding a mean density of 8.00 -1.45 +1.83 g cm -3 and suggesting a rocky-iron composition. Models indicate that iron cannot exceed ∼70% of the total mass. With an orbital period of only 6.7 h, K2-141 b is the shortest-period planet known to date with a precisely determined mass.
Planets and satellites: individual: EPIC 246393474 b
Stars: fundamental parameters
Techniques: photometric
Stars: individual: EPIC 246393474
Techniques: radial velocities
Planetary systems
Författare
O. Barragán
Universita degli Studi di Torino
D. Gandolfi
Universita degli Studi di Torino
Fei Dai
Massachusetts Institute of Technology (MIT)
Princeton University
J.H. Livingston
University of Tokyo
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
T. Hirono
Tokyo Institute of Technology
Norio Narita
University of Tokyo
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. N. Winn
Princeton University
David Nespral
Instituto de Astrofísica de Canarias
Universidad de la Laguna
J. Prieto-Arranz
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Alexis M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
G. Nowak
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Simon Albrecht
Aarhus Universitet
Giuliano Antoniciello
Universita degli Studi di Torino
A.B. Justesen
Aarhus Universitet
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
William D. Cochran
The University of Texas at Austin
H. Deeg
Universidad de la Laguna
Instituto de Astrofísica de Canarias
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, Astronomi och plasmafysik
Universiteit Leiden
A. Fukui
National Astronomical Observatory of Japan
S. Grziwa
Universität zu Köln
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. Hatzes
Thüringer Landessternwarte Tautenburg
D. Hidalgo
Instituto de Astrofísica de Canarias
Universidad de la Laguna
M.C. Johnson
Ohio State University
Judith Korth
Universität zu Köln
E. Palle
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Martin Pätzold
Universität zu Köln
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Technische Universität Berlin
Yusuke Tanaka
University of Tokyo
Vincent Van Eylen
Universiteit Leiden
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 612 A95Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två missioner
Rymdstyrelsen (174/18), 2017-01-01 -- 2022-12-31.
Ämneskategorier
Astronomi, astrofysik och kosmologi
Geofysik
Multidisciplinär geovetenskap
DOI
10.1051/0004-6361/201732217