NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit

Edward M. Bryant, Daniel Bayliss, Louise D. Nielsen, Dimitri Veras, Jack S. Acton, David R. Anderson, David J. Armstrong, François Bouchy, Joshua T. Briegal, Matthew R. Burleigh, Juan Cabrera, Sarah L. Casewell, Alexander Chaushev, Benjamin F. Cooke, Szilárd Csizmadia, Philipp Eigmüller, Anders Erikson, Samuel Gill, Edward Gillen, Michael R. GoadNolan Grieves, Maximilian N. Günther, Beth Henderson, Aleisha Hogan, James S. Jenkins, Monika Lendl, James McCormac, Maximiliano Moyano, Didier Queloz, Heike Rauer, Liam Raynard, Alexis M. S. Smith, Rosanna H. Tilbrook, Stéphane Udry, Jose I. Vines, Christopher A. Watson, Richard G. West, Peter J. Wheatley

Research output: Contribution to journalArticlepeer-review

Abstract

We report the discovery of the transiting exoplanet NGTS-12b by the Next Generation Transit Survey (NGTS). The host star, NGTS-12, is a V = 12.38mag star with an effective temperature of Teff = 5690± 130 K. NGTS-12b orbits with a period of P = 7.53 d, making it the longest period planet discovered to date by the main NGTS survey. We verify the NGTS transit signal with data extracted from the Transiting Exoplanet Survey Satellite (TESS) full-frame images, and combining the photometry with radial velocity measurements from HARPS and FEROS we determine NGTS-12b to have a mass of 0.208 ± 0.022 MJ and a radius of 1.048 ± 0.032 RJ. NGTS-12b sits on the edge of the Neptunian desert when we take the stellar properties into account, highlighting the importance of considering both the planet and star when studying the desert. The long period of NGTS-12b combined with its low density of just 0.223 ± 0.029 g cm-3 make it an attractive target for atmospheric characterization through transmission spectroscopy with a Transmission Spectroscopy Metric of 89.4.
Original languageEnglish
Pages (from-to)3139-3148
JournalMonthly Notices of the Royal Astronomical Society
Volume499
Issue number3
DOIs
Publication statusPublished - 28 Sep 2020
Externally publishedYes

Keywords

  • techniques: photometric
  • stars: individual: NGTS-12
  • planetary systems
  • planets and satellites: detection

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