K2-260 b: A hot Jupiter transiting an F star, and K2-261 b: A warm Saturn around a bright G star
Artikel i vetenskaplig tidskrift, 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: individual: K2-260 b

K2-261 b

Planets and satellites: detection

Författare

M.C. Johnson

Ohio State University

Fei Dai

Princeton University

Massachusetts Institute of Technology (MIT)

A.B. Justesen

Aarhus Universitet

D. Gandolfi

Universita degli Studi di Torino

A. Hatzes

Thüringer Landessternwarte Tautenburg

G. Nowak

Universidad de la Laguna

Instituto Astrofisico de Canarias

M. Endl

The University of Texas at Austin

William D. Cochran

The University of Texas at Austin

D. Hidalgo

Instituto Astrofisico de Canarias

Universidad de la Laguna

Noriharu Watanabe

The Graduate University for Advanced Studies (SOKENDAI)

H. Parviainen

Universidad de la Laguna

Instituto Astrofisico de Canarias

T. Hirano

University of Hawaii at Manoa

Tokyo Institute of Technology

S. Villanueva

Ohio State University

J. Prieto-Arranz

Instituto Astrofisico de Canarias

Universidad de la Laguna

Norio Narita

University of Tokyo

National Institutes of Natural Sciences

Japan Science and Technology Agency

Instituto Astrofisico de Canarias

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

E. W. Guenther

Thüringer Landessternwarte Tautenburg

O. Barragán

Universita degli Studi di Torino

T. Trifonov

Max Planck-institutet

Prajwal Niraula

Wesleyan University Middletown

P. MacQueen

The University of Texas at Austin

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

P. Eigmüller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. Grziwa

Universität zu Köln

Judith Korth

Universität zu Köln

Martin Pätzold

Universität zu Köln

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Simon Albrecht

Aarhus Universitet

R. Alonso

Instituto Astrofisico de Canarias

Universidad de la Laguna

H. Deeg

Instituto Astrofisico de Canarias

Universidad de la Laguna

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Esposito

Thüringer Landessternwarte Tautenburg

Malcolm Fridlund

Universiteit Leiden

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

A. Fukui

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

Nobuhiko Kusakabe

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

National Institutes of Natural Sciences

M. Kuzuhara

National Institutes of Natural Sciences

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

J.H. Livingston

University of Tokyo

P. M. Rodriguez

Universidad de la Laguna

Instituto Astrofisico de Canarias

David Nespral

Instituto Astrofisico de Canarias

Universidad de la Laguna

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

T. Purismo

Nordic Optical Telescope

S. Raimundo

Niels Bohr Institute

H. Rauer

Deutsches Zentrums für Luft- und Raumfahrt (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

National Institutes of Natural Sciences

Vincent Van Eylen

Universiteit Leiden

J. N. Winn

Princeton University

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 481 1 596-612

Exoplaneter från rymden - CHEOPS och PLATO

Rymdstyrelsen, 2017-01-01 -- 2022-12-31.

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1093/mnras/sty2238

Mer information

Senast uppdaterat

2018-10-19