NGTS 15b, 16b, 17b, and 18b: four hot Jupiters from the Next-Generation Transit Survey

Rosanna H. Tilbrook, Matthew R. Burleigh, Jean C. Costes, Samuel Gill, Louise D. Nielsen, José I. Vines, Didier Queloz, Simon T. Hodgkin, Hannah L. Worters, Michael R. Goad, Jack S. Acton, Beth A. Henderson, David J. Armstrong, David R. Anderson, Daniel Bayliss, François Bouchy, Joshua T. Briegal, Edward M. Bryant, Sarah L. Casewell, Alexander ChaushevBenjamin F. Cooke, Philipp Eigmüller, Edward Gillen, Maximilian N. Günther, Aleisha Hogan, James S. Jenkins, Monika Lendl, James McCormac, Maximiliano Moyano, Liam Raynard, Alexis M. S. Smith, Stéphane Udry, Christopher A. Watson, Richard G. West, Peter J. Wheatley, Hannes Breytenbach, Ramotholo R. Sefako, Jessymol K. Thomas, Douglas R. Alves

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Abstract

We report the discovery of four new hot Jupiters with the Next Generation Transit Survey (NGTS). NGTS-15b, NGTS-16b, NGTS-17b, and NGTS-18b are short-period (P < 5d) planets orbiting G-type main sequence stars, with radii and masses between 1.10–1.30 RJ and 0.41–0.76 MJ. By considering the host star luminosities and the planets’ small orbital separations (0.039–0.052 AU), we find that all four hot Jupiters are highly irradiated and therefore occupy a region of parameter space in which planetary inflation mechanisms become effective. Comparison with statistical studies and a consideration of the planets’ high incident fluxes reveals that NGTS-16b, NGTS-17b, and NGTS-18b are indeed likely inflated, although some disparities arise upon analysis with current Bayesian inflationary models. However, the underlying relationships which govern radius inflation remain poorly understood. We postulate that the inclusion of additional hyperparameters to describe latent factors such as heavy element fraction, as well as the addition of an updated catalogue of hot Jupiters, would refine inflationary models, thus furthering our understanding of the physical processes which give rise to inflated planets.
Original languageEnglish
Pages (from-to)6018–6032
JournalMonthly Notices of the Royal Astronomical Society
Volume504
Issue number4
Early online date30 Mar 2021
DOIs
Publication statusPublished - Jul 2021

Keywords

  • Astronomy and Astrophysics
  • Space and Planetary Science

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