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.

K2-261 b

Planets and satellites: detection

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

Instituto Astrofisico de Canarias

University of La Laguna

M. Endl

The University of Texas at Austin

William D. Cochran

The University of Texas at Austin

D. Hidalgo

Instituto Astrofisico de Canarias

University of La Laguna

Noriharu Watanabe

The Graduate University for Advanced Studies (SOKENDAI)

H. Parviainen

University of La Laguna

Instituto Astrofisico de Canarias

T. Hirano

University of Hawaii

Tokyo Institute of Technology

S. Villanueva

Ohio State University

J. Prieto-Arranz

University of La Laguna

Instituto Astrofisico de Canarias

Norio Narita

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Instituto Astrofisico de Canarias

Japan Science and Technology Agency

University of Tokyo

E. Palle

Instituto Astrofisico de Canarias

University of La Laguna

E. W. Guenther

Thüringer Landessternwarte Tautenburg

O. Barragán

University of Turin

T. Trifonov

Max Planck Institute

Prajwal Niraula

Wesleyan University

P. MacQueen

The University of Texas at Austin

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

University of La Laguna

Instituto Astrofisico de Canarias

H. Deeg

Instituto Astrofisico de Canarias

University of La Laguna

Anders Erikson

German Aerospace Center (DLR)

M. Esposito

Thüringer Landessternwarte Tautenburg

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

Leiden University

A. Fukui

National Astronomical Observatory of Japan

Nobuhiko Kusakabe

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

M. Kuzuhara

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

J.H. Livingston

University of Tokyo

P. M. Rodriguez

University of La Laguna

Instituto Astrofisico de Canarias

David Nespral

University of La Laguna

Instituto Astrofisico de Canarias

Carina Persson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

T. Purismo

Nordic Optical Telescope

S. Raimundo

Niels Bohr Institute

H. Rauer

Technische Universität Berlin

German Aerospace Center (DLR)

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 1 596-612

Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects

Swedish National Space Board, 2017-01-01 -- 2022-12-31.

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

DOI

10.1093/mnras/sty2238

More information

Latest update

9/10/2019