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korth

Judith Korth

Postdoc

korth

TOI-544 b:ã potential water-world inside the radius valley inã two-planet system

Author

  • H. L.M. Osborne
  • V. Van Eylen
  • E. Goffo
  • D. Gandolfi
  • G. Nowak
  • C. M. Persson
  • J. Livingston
  • A. Weeks
  • E. Palle
  • R. Luque
  • C. Hellier
  • I. Carleo
  • S. Redfield
  • T. Hirano
  • M. Garbaccio Gili
  • J. Alarcon
  • O. Barragan
  • N. Casasayas-Barris
  • M. R. Díaz
  • M. Esposito
  • E. Knudstrup
  • J. S. Jenkins
  • F. Murgas
  • J. Orell-Miquel
  • F. Rodler
  • L. Serrano
  • M. Stangret
  • S. H. Albrecht
  • A. Alqasim
  • W. D. Cochran
  • H. J. Deeg
  • M. Fridlund
  • A. P. Hatzes
  • J. Korth
  • K. W.F. Lam
Show all

Summary, in English

We report on the precise radial velocity follow-up of TOI-544 (HD 290498),ã bright K star ( V = 10.8), which hostsã small transiting planet recently disco v ered by the Trãnsiting Exoplanet Survey Satellite (TESS) . We collected 122 high-resolution High Accuracy Radial velocity Planet Searcher (HARPS)ãnd HARPS-N spectra to spectroscopically confirm the transiting planetãnd measure its mass. The nearly 3-yr baseline of our follow-upãllowed us to unveil the presence ofãnãdditional, non-transiting, longer-period companion planet. We derivedã radiusãnd mass for the inner planet, TOI-544 b, of 2.018 ±0.076 R⊙and 2.89 ±0.48 M⊙, respectively, which givesã bulk density of 1 . 93 + 0 . 30 -0 . 25 g cm -3 . TOI-544 c hasã minimum mass of 21.5 ±2.0 M⊙and orbital period of 50.1 ±0.2 d. The low density of planet-b implies that it has eitherãn Earth-like rocky core withã hydrogenãtmosphere, orã composition which harboursã significant fraction of water. The composition interpretation is degenerate depending on the specific choice of planet interior models used. Additionally, TOI-544 b hasãn orbital period of 1.55 dãnd equilibrium temperature of 999 ±14 K, placing it within the predicted location of the radius valley, where few planetsãre expected. TOI-544 b isã top target for futureãtmospheric observations, for example with JWST , which would enable better constraints of the planet composition.

Department/s

  • Astrophysics

Publishing year

2024-02-01

Language

English

Pages

11138-11157

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

527

Issue

4

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • planetsãnd satellites: composition
  • planetsãnd satellites: detection
  • techniques: radial velocities

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711