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Judith Korth



Hot planets around cool stars - Two short-period mini-Neptunes transiting the late K-dwarf TOI-1260


  • I. Y. Georgieva
  • C. M. Persson
  • O. Barragán
  • G. Nowak
  • M. Fridlund
  • D. Locci
  • E. Palle
  • R. Luque
  • I. Carleo
  • D. Gandolfi
  • S. R. Kane
  • J. Korth
  • K. G. Stassun
  • J. Livingston
  • E. C. Matthews
  • K. A. Collins
  • S. B. Howell
  • L. M. Serrano
  • S. Albrecht
  • A. Bieryla
  • C. E. Brasseur
  • D. Ciardi
  • W. D. Cochran
  • K. D. Colon
  • I. J.M. Crossfield
  • Sz Csizmadia
  • H. J. Deeg
  • M. Esposito
  • E. Furlan
  • T. Gan
  • E. Goffo
  • E. Gonzales
  • S. Grziwa
  • E. W. Guenther
  • P. Guerra
  • T. Hirano
  • J. M. Jenkins
  • E. L.N. Jensen
  • P. Kabáth
  • E. Knudstrup
  • K. W.F. Lam
  • D. W. Latham
  • A. M. Levine
  • R. A. Matson
  • S. McDermott
  • H. L.M. Osborne
  • M. Paegert
  • S. N. Quinn
  • S. Redfield
  • G. R. Ricker
  • J. E. Schlieder
  • N. J. Scott
  • S. Seager
  • A. M.S. Smith
  • P. Tenenbaum
  • J. D. Twicken
  • R. Vanderspek
  • V. Van Eylen
  • J. N. Winn

Summary, in English

We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6 V dwarf star. Photometry from Transiting Exoplanet Survey Satellite(TESS) yields radii of Rb = 2.33 ± 0.10 and Rc = 2.82 ± 0.15 R⊕, and periods of 3.13 and 7.49 d for TOI-1260 b and TOI-1260 c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain Mb = 8.6- 1.5+ 1.4 and Mc = 11.8- 3.2+ 3.4 M⊕. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light-curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian process approach. We test the system's stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the 2-3 R⊕ range.

Publishing year







Monthly Notices of the Royal Astronomical Society





Document type

Journal article


Oxford University Press


  • planetary systems
  • planets and satellites: atmospheres
  • planets and satellites: composition
  • planets and satellites: individual: TOI-1260b, c
  • stars: low-mass
  • techniques: photometric
  • techniques: radial velocities




  • ISSN: 0035-8711