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Judith Korth



TOI-733 b : A planet in the small-planet radius valley orbiting a Sun-like star


  • Iskra Y. Georgieva
  • Carina M. Persson
  • Elisa Goffo
  • Lorena Acuña
  • Artyom Aguichine
  • Luisa M. Serrano
  • Kristine W.F. Lam
  • Davide Gandolfi
  • Karen A. Collins
  • Steven B. Howell
  • Fei Dai
  • Malcolm Fridlund
  • Judith Korth
  • Magali Deleuil
  • Oscar Barragán
  • William D. Cochran
  • Szilárd Csizmadia
  • Hans J. Deeg
  • Eike Guenther
  • Artie P. Hatzes
  • Jon M. Jenkins
  • John Livingston
  • Rafael Luque
  • Olivier Mousis
  • Hannah L.M. Osborne
  • Enric Palle
  • Seth Redfield
  • Vincent Van Eylen
  • Joseph D. Twicken
  • Joshua N. Winn
  • Ahlam Alqasim
  • Kevin I. Collins
  • Crystal L. Gnilka
  • David W. Latham
  • Hannah M. Lewis
  • Howard M. Relles
  • George R. Ricker
  • Pamela Rowden
  • Sara Seager
  • Avi Shporer
  • Thiam Guan Tan
  • Andrew Vanderburg
  • Roland Vanderspek

Summary, in English

We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered as part of the KESPRINT follow-up program of TESS planets carried out with the HARPS spectrograph. TESS photometry from sectors 9 and 36 yields an orbital period of {equation presented} days and a radius of {equation presented}. Multi-dimensional Gaussian process modelling of the radial velocity measurements from HARPS and activity indicators gives a semi-amplitude of K = 2.23 ± 0.26 m s-1, translating into a planet mass of {equation presented}. These parameters imply that the planet is of moderate density ({equation presented}) and place it in the transition region between rocky and volatile-rich planets with H/He-dominated envelopes on the mass-radius diagram. Combining these with stellar parameters and abundances, we calculated planet interior and atmosphere models, which in turn suggest that TOI-733 b has a volatile-enriched, most likely secondary outer envelope, and may represent a highly irradiated ocean world. This is one of only a few such planets around G-type stars that are well characterised.


  • Astrophysics

Publishing year





Astronomy and Astrophysics



Document type

Journal article


EDP Sciences


  • Astronomy, Astrophysics and Cosmology


  • Planets and satellites: composition
  • Planets and satellites: detection
  • Planets and satellites: individual: TOI-733
  • Techniques: photometric
  • Techniques: radial velocities




  • ISSN: 0004-6361