K2-260 b: A hot Jupiter transiting an F star, and K2-261 b: A warm Saturn around a bright G star
Journal article, 2018
We present the discovery and confirmation of two new transiting giant planets from the Kepler extended mission K2. K2-260 b is a hot Jupiter transiting a V = 12.7 F6V star in K2 Field 13, with a mass and radius of M = 1.39-0.06+0.05M⊙and R = 1.69 ± 0.03 R. The planet has an orbital period of P = 2.627 d, and a mass and radius of MP= 1.42-0.32+0.31MJand RP= 1.552-0.057+0.048RJ. This is the first K2 hot Jupiter with a detected secondary eclipse in the Kepler bandpass, with a depth of 71 ± 15 ppm, which we use to estimate a geometric albedo of Ag~ 0.2. We also detected a candidate stellar companion at 0.6 arcsec from K2-260; we find that it is very likely physically associated with the system, in which case it would be an M5-6V star at a projected separation of ~400 au. K2-261 b is a warm Saturn transiting a bright (V = 10.5) G7IV/V star in K2 Field 14. The host star is a metal rich ([Fe/H] = 0.36 ± 0.06), mildly evolved 1.10-0.02+0.01M⊙star with R = 1.65 ± 0.04 R. Thanks to its location near the main-sequence turn-off, we can measure a relatively precise age of 8.8-0.3+0.4Gyr. The planet has P = 11.633 d, MP= 0.223 ± 0.031 MJ, and RP= 0.850-0.022+0.026RJ, and its orbit is eccentric (e = 0.39 ± 0.15). Its brightness and relatively large transit depth make this one of the best-known warm Saturns for follow-up observations to further characterize the planetary system.
Planets and satellites: detection
K2-261 b
Planets and satellites: individual: K2-260 b
Author
M.C. Johnson
Ohio State University
Fei Dai
Princeton University
Massachusetts Institute of Technology (MIT)
A.B. Justesen
Aarhus University
D. Gandolfi
University of Turin
A. Hatzes
Thüringer Landessternwarte Tautenburg
G. Nowak
University of La Laguna
Instituto de Astrofísica de Canarias
M. Endl
University of Texas
William D. Cochran
University of Texas
D. Hidalgo
Instituto de Astrofísica de Canarias
University of La Laguna
Noriharu Watanabe
The Graduate University for Advanced Studies (SOKENDAI)
H. Parviainen
University of La Laguna
Instituto de Astrofísica de Canarias
T. Hirano
University of Hawaii
Tokyo Institute of Technology
S. Villanueva
Ohio State University
J. Prieto-Arranz
Instituto de Astrofísica de Canarias
University of La Laguna
Norio Narita
National Institutes of Natural Sciences
University of Tokyo
Instituto de Astrofísica de Canarias
National Astronomical Observatory of Japan
Japan Science and Technology Agency
E. Palle
University of La Laguna
Instituto de Astrofísica de Canarias
E. W. Guenther
Thüringer Landessternwarte Tautenburg
O. Barragán
University of Turin
T. Trifonov
Max Planck Society
Prajwal Niraula
Wesleyan University
P. MacQueen
University of Texas
J. Cabrera
German Aerospace Center (DLR)
Szilard Csizmadia
German Aerospace Center (DLR)
P. Eigmüller
German Aerospace Center (DLR)
S. Grziwa
University of Cologne
Judith Korth
University of Cologne
Martin Pätzold
University of Cologne
Alexis M. S. Smith
German Aerospace Center (DLR)
Simon Albrecht
Aarhus University
R. Alonso
Instituto de Astrofísica de Canarias
University of La Laguna
H. Deeg
University of La Laguna
Instituto de Astrofísica de Canarias
Anders Erikson
German Aerospace Center (DLR)
M. Esposito
Thüringer Landessternwarte Tautenburg
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Leiden University
A. Fukui
National Astronomical Observatory of Japan
Nobuhiko Kusakabe
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
M. Kuzuhara
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
J.H. Livingston
University of Tokyo
P. M. Rodriguez
Instituto de Astrofísica de Canarias
University of La Laguna
David Nespral
Instituto de Astrofísica de Canarias
University of La Laguna
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
T. Purismo
Nordic Optical Telescope
S. Raimundo
Niels Bohr Institute
H. Rauer
German Aerospace Center (DLR)
Technische Universität Berlin
I. Ribas
Universitat Autonoma de Barcelona (UAB)
Motohide Tamura
University of Tokyo
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
Vincent Van Eylen
Leiden University
J. N. Winn
Princeton University
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 481 1 596-612Exoplanets 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
Roots
Basic sciences
DOI
10.1093/mnras/sty2238