NGTS-6b: an ultrashort period hot-Jupiter orbiting an old K dwarf

Jose I. Vines, James S. Jenkins, Jack S. Acton, Joshua Briegal, Daniel Bayliss, François Bouchy, Claudia Belardi, Edward M. Bryant, Matthew R. Burleigh, Juan Cabrera, Sarah L. Casewell, Alexander Chaushev, Benjamin F. Cooke, Szilárd Csizmadia, Philipp Eigmüller, Anders Erikson, Emma Foxell, Samuel Gill, Edward Gillen, Michael R. GoadJames A. G. Jackman, George W. King, Tom Louden, James McCormac, Maximiliano Moyano, Louise D. Nielsen, Don Pollacco, Didier Queloz, Heike Rauer, Liam Raynard, Alexis M. S. Smith, Maritza G. Soto, Rosanna H. Tilbrook, Ruth Titz-Weider, Oliver Turner, Stéphane Udry, Simon R. Walker, Christopher A. Watson, Richard G. West, Peter J. Wheatley

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We report the discovery of a new ultrashort period hot Jupiter from the Next Generation Transit Survey. NGTS-6b orbits its star with a period of 21.17 h, and has a mass and radius of 1.330^{+0.024}_{-0.028}MJ and 1.271^{+0.197}_{-0.188}RJ, respectively, returning a planetary bulk density of 0.711^{+0.214}_{-0.136} g cm-3. Conforming to the currently known small population of ultrashort period hot Jupiters, the planet appears to orbit a metal-rich star ([Fe/H] = +0.11 ± 0.09 dex). Photoevaporation models suggest the planet should have lost 5 per cent of its gaseous atmosphere over the course of the 9.6 Gyr of evolution of the system. NGTS-6b adds to the small, but growing list of ultrashort period gas giant planets, and will help us to understand the dominant formation and evolutionary mechanisms that govern this population.
Original languageEnglish
Pages (from-to)4125-4134
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date27 Aug 2019
Publication statusPublished - 01 Nov 2019
Externally publishedYes


  • planets and satellites: detection
  • planetary systems


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