K2-141 b: A 5-M⊕ super-Earth transiting a K7 V star every 6.7 hours
Journal article, 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
Techniques: radial velocities
Techniques: photometric
Planetary systems
Stars: fundamental parameters
Stars: individual: EPIC 246393474
Author
O. Barragán
University of Turin
D. Gandolfi
University of Turin
Fei Dai
Princeton University
Massachusetts Institute of Technology (MIT)
J.H. Livingston
University of Tokyo
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
T. Hirono
Tokyo Institute of Technology
Norio Narita
National Institutes of Natural Sciences
University of Tokyo
National Astronomical Observatory of Japan
Szilard Csizmadia
German Aerospace Center (DLR)
J. N. Winn
Princeton University
David Nespral
University of La Laguna
Instituto de Astrofísica de Canarias
J. Prieto-Arranz
Instituto de Astrofísica de Canarias
University of La Laguna
Alexis M. S. Smith
German Aerospace Center (DLR)
G. Nowak
University of La Laguna
Instituto de Astrofísica de Canarias
Simon Albrecht
Aarhus University
Giuliano Antoniciello
University of Turin
A.B. Justesen
Aarhus University
J. Cabrera
German Aerospace Center (DLR)
William D. Cochran
University of Texas
H. Deeg
Instituto de Astrofísica de Canarias
University of La Laguna
P. Eigmüller
German Aerospace Center (DLR)
M. Endl
University of Texas
Anders Erikson
German Aerospace Center (DLR)
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Leiden University
A. Fukui
National Astronomical Observatory of Japan
S. Grziwa
University of Cologne
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. Hatzes
Thüringer Landessternwarte Tautenburg
D. Hidalgo
Instituto de Astrofísica de Canarias
University of La Laguna
M.C. Johnson
Ohio State University
Judith Korth
University of Cologne
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
Martin Pätzold
University of Cologne
H. Rauer
German Aerospace Center (DLR)
Technische Universität Berlin
Yusuke Tanaka
University of Tokyo
Vincent Van Eylen
Leiden University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 612 A95Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects
Swedish National Space Board (174/18), 2017-01-01 -- 2022-12-31.
Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Geophysics
Geosciences, Multidisciplinary
DOI
10.1051/0004-6361/201732217