The discovery of three hot Jupiters, NGTS-23b, 24b and 25b, and updated parameters for HATS-54b from the Next Generation Transit Survey - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

The discovery of three hot Jupiters, NGTS-23b, 24b and 25b, and updated parameters for HATS-54b from the Next Generation Transit Survey

David G. Jackson
  • Function : Author
Christopher A. Watson
  • Function : Author
Ernst J. W. de Mooij
  • Function : Author
Jack S. Acton
  • Function : Author
Douglas R. Alves
  • Function : Author
David R. Anderson
  • Function : Author
David J. Armstrong
  • Function : Author
Daniel Bayliss
  • Function : Author
Claudia Belardi
  • Function : Author
François Bouchy
Edward M. Bryant
  • Function : Author
Matthew R. Burleigh
  • Function : Author
Sarah L. Casewell
  • Function : Author
Phillip Eigmüller
  • Function : Author
Michael R. Goad
  • Function : Author
Samuel Gill
  • Function : Author
Edward Gillen
  • Function : Author
Maximilian N. Günther
  • Function : Author
Faith Hawthorn
  • Function : Author
Beth A. Henderson
  • Function : Author
James A. G. Jackman
  • Function : Author
James S. Jenkins
  • Function : Author
Monika Lendl
  • Function : Author
Alicia Kendall
  • Function : Author
James Mccormac
  • Function : Author
Maximiliano Moyano
  • Function : Author
Louise D. Nielsen
  • Function : Author
Ares Osborn
  • Function : Author
Ramotholo R. Sefako
  • Function : Author
Alexis M. S. Smith
  • Function : Author
Rosanna H. Tilbrook
  • Function : Author
Oliver Turner
  • Function : Author
Stéphane Udry
  • Function : Author
Jose I. Vines
  • Function : Author
Richard G. West
  • Function : Author
Peter J. Wheatley
  • Function : Author
Hannah Worters
  • Function : Author

Abstract

We report the discovery of three new hot Jupiters with the Next Generation Transit Survey (NGTS) as well as updated parameters for HATS-54b, which was independently discovered by NGTS. NGTS-23b, NGTS-24b and NGTS-25b have orbital periods of 4.076, 3.468, and 2.823 days and orbit G-, F- and K-type stars, respectively. NGTS-24 and HATS-54 appear close to transitioning off the main-sequence (if they are not already doing so), and therefore are interesting targets given the observed lack of hot Jupiters around sub-giant stars. By considering the host star luminosities and the planets' small orbital separations (0.037-0.050 au), we find that all four hot Jupiters are above the minimum irradiance threshold for inflation mechanisms to be effective. NGTS-23b has a mass of 0.61 MJ and radius of 1.27 RJ and is likely inflated. With a radius of 1.21 RJ and mass of 0.52 MJ, NGTS-24b has a radius larger than expected from non-inflated models but its radius is smaller than the predicted radius from current Bayesian inflationary models. Finally, NGTS-25b is intermediate between the inflated and non-inflated cases, having a mass of 0.64 MJ and a radius of 1.02 RJ. The physical processes driving radius inflation remain poorly understood, and by building the sample of hot Jupiters we can aim to identify the additional controlling parameters, such as metallicity and stellar age.
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Dates and versions

insu-03863223 , version 1 (11-04-2023)

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David G. Jackson, Christopher A. Watson, Ernst J. W. de Mooij, Jack S. Acton, Douglas R. Alves, et al.. The discovery of three hot Jupiters, NGTS-23b, 24b and 25b, and updated parameters for HATS-54b from the Next Generation Transit Survey. Monthly Notices of the Royal Astronomical Society, 2022, ⟨10.1093/mnras/stac3192⟩. ⟨insu-03863223⟩
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