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korth

Judith Korth

Postdoc

korth

K2-280 b-a low density warm sub-Saturn around a mildly evolved star

Author

  • Grzegorz Nowak
  • Enric Palle
  • Davide Gandolfi
  • Hans J. Deeg
  • Teruyuki Hirano
  • Oscar Barragán
  • Masayuki Kuzuhara
  • Fei Dai
  • Rafael Luque
  • Carina M. Persson
  • Malcolm Fridlund
  • Marshall C. Johnson
  • Judith Korth
  • John H. Livingston
  • Sascha Grziwa
  • Savita Mathur
  • Artie P. Hatzes
  • Jorge Prieto-Arranz
  • David Nespral
  • Diego Hidalgo
  • Maria Hjorth
  • Simon Albrecht
  • Vincent Van Eylen
  • Kristine W.F. Lam
  • William D. Cochran
  • Massimiliano Esposito
  • Szilárd Csizmadia
  • Eike W. Guenther
  • Petr Kabath
  • Pere Blay
  • Rafael Brahm
  • Andrés Jordán
  • Néstor Espinoza
  • Felipe Rojas
  • Núria Casasayas Barris
  • Florian Rodler
  • Roi Alonso Sobrino
  • Juan Cabrera
  • Ilaria Carleo
  • Alexander Chaushev
  • Jerome De Leon
  • Philipp Eigmüller
  • Michael Endl
  • Anders Erikson
  • Akihiko Fukui
  • Iskra Georgieva
  • Lucía González-Cuesta
  • Emil Knudstrup
  • Mikkel N. Lund
  • Pilar Montañes Rodríguez
  • Felipe Murgas
  • Norio Narita
  • Prajwal Niraula
  • Martin Pätzold
  • Heike Rauer
  • Seth Redfield
  • Ignasi Ribas
  • Marek Skarka
  • Alexis M.S. Smith
  • Jan Subjak
Show all

Summary, in English

We present an independent discovery and detailed characterization of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-d moderately eccentric orbit (e = 0.35 -0.04+0.05) from K2 campaign 7. A joint analysis of high precision HARPS, HARPS-N, and FIES radial velocity measurements and K2 photometric data indicates that K2-280 b has a radius of Rb = 7.50 ± 0.44 R⊕ and a mass of Mb = 37.1 ± 5.6 M⊕, yielding a mean density of ρb = 0.48 -0.10+0.13 g cm-3. The host star is a mildly evolved G7 star with an effective temperature of Teff = 5500 ± 100 K, a surface gravity of log g = 4.21 ± 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 ± 0.08 dex, and with an inferred mass of M∗ = 1.03 ± 0.03 M⊙ and a radius of R∗ = 1.28 ± 0.07 R⊙. We discuss the importance of K2-280 b for testing formation scenarios of sub-Saturn planets and the current sample of this intriguing group of planets that are absent in the Solar system.

Publishing year

2020-10-01

Language

English

Pages

4423-4435

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

497

Issue

4

Document type

Journal article

Publisher

Oxford University Press

Keywords

  • K2-280)
  • planets and satellites: detection
  • stars: individual: (EPIC 216494238
  • techniques: photometric
  • techniques: radial velocities
  • techniques: spectroscopic

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711