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korth

Judith Korth

Postdoc

korth

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

Author

  • M. C. Johnson
  • F. Dai
  • A. B. Justesen
  • D. Gandolfi
  • A. P. Hatzes
  • G. Nowak
  • M. Endl
  • W. D. Cochran
  • D. Hidalgo
  • N. Watanabe
  • H. Parviainen
  • T. Hirano
  • S. Villanueva
  • J. Prieto-Arranz
  • N. Narita
  • E. Palle
  • E. W. Guenther
  • O. Barragán
  • T. Trifonov
  • P. Niraula
  • P. J. MacQueen
  • J. Cabrera
  • Sz Csizmadia
  • Ph Eigmüller
  • S. Grziwa
  • J. Korth
  • M. Pätzold
  • A. M.S. Smith
  • S. Albrecht
  • R. Alonso
  • H. Deeg
  • A. Erikson
  • M. Esposito
  • M. Fridlund
  • A. Fukui
  • N. Kusakabe
  • M. Kuzuhara
  • J. Livingston
  • P. Montañes Rodriguez
  • D. Nespral
  • C. M. Persson
  • T. Purismo
  • S. Raimundo
  • H. Rauer
  • I. Ribas
  • M. Tamura
  • V. Van Eylen
  • J. N. Winn
Show all

Summary, in English

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+0.05 M⊙ 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+0.31 MJ and RP = 1.552-0.057+0.048 RJ. 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+0.01 M⊙ 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+0.4 Gyr. The planet has P = 11.633 d, MP = 0.223 ± 0.031 MJ, and RP = 0.850-0.022+0.026 RJ, 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.

Publishing year

2018-11-21

Language

English

Pages

596-612

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

481

Issue

1

Document type

Journal article

Publisher

Oxford University Press

Keywords

  • K2-261 b
  • Planets and satellites: detection
  • Planets and satellites: individual: K2-260 b

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711