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korth

Judith Korth

Postdoc

korth

K2-290 : A warm Jupiter and a mini-Neptune in a triple-star system

Author

  • M. Hjorth
  • A. B. Justesen
  • T. Hirano
  • S. Albrecht
  • D. Gandolfi
  • F. Dai
  • R. Alonso
  • O. Barragán
  • M. Esposito
  • M. Kuzuhara
  • K. W.F. Lam
  • J. H. Livingston
  • P. Montanes-Rodriguez
  • N. Narita
  • G. Nowak
  • J. Prieto-Arranz
  • S. Redfield
  • F. Rodler
  • V. Van Eylen
  • J. N. Winn
  • G. Antoniciello
  • J. Cabrera
  • W. D. Cochran
  • Sz Csizmadia
  • J. De Leon
  • H. Deeg
  • Ph Eigmüller
  • M. Endl
  • A. Erikson
  • M. Fridlund
  • S. Grziwa
  • E. Guenther
  • A. P. Hatzes
  • P. Heeren
  • D. Hidalgo
  • J. Korth
  • R. Luque
  • D. Nespral
  • E. Palle
  • M. Pätzold
  • C. M. Persson
  • H. Rauer
  • A. M.S. Smith
  • T. Trifonov
Show all

Summary, in English

We report the discovery of two transiting planets orbiting K2-290 (EPIC 249624646), a bright (V = 11.11) late F-type star residing in a triple-star system. It was observed during Campaign 15 of the K2 mission, and in order to confirm and characterize the system, follow-up spectroscopy and AO imaging were carried out using the FIES, HARPS, HARPS-N, and IRCS instruments. From AO imaging and Gaia data we identify two M-dwarf companions at a separation of 113 ± 2 and 2467+−177155 au. From radial velocities, K2 photometry, and stellar characterization of the host star, we find the inner planet to be a mini-Neptune with a radius of 3.06 ± 0.16 R and an orbital period of P = 9.2 d. The radius of the mini-Neptune suggests that the planet is located above the radius valley, and with an incident flux of F ∼ 400 F, it lies safely outside the super-Earth desert. The outer warm Jupiter has a mass of 0.774 ± 0.047 MJ and a radius of 1.006 ± 0.050 RJ, and orbits the host star every 48.4 d on an orbit with an eccentricity e < 0.241. Its mild eccentricity and mini-Neptune sibling suggest that the warm Jupiter originates from in situ formation or disc migration.

Publishing year

2019-04-11

Language

English

Pages

3522-3536

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

484

Issue

3

Document type

Journal article

Publisher

Oxford University Press

Keywords

  • Planets
  • Planets and satellites: detection
  • Planets and satellites: formation
  • Planets and satellites: individual: K2-290
  • Satellites: individual: EPIC 249624646

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711