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

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journal contribution
posted on 13.10.2020, 08:44 by Edward M Bryant, Daniel Bayliss, Louise D Nielsen, Dimitri Veras, Jack S Acton, David R Anderson, David J Armstrong, Francois Bouchy, Joshua T Briegal, Matthew R Burleigh, Juan Cabrera, Sarah L Casewell, Alexander Chaushev, Benjamin F Cooke, Szilard Csizmadia, Philipp Eigmuller, Anders Erikson, Samuel Gill, Edward Gillen, Michael R Goad, Nolan Grieves, Maximilian N Gunther, Beth Henderson, Aleisha Hogan, James S Jenkins, Monika Lendl, James McCormac, Maximiliano Moyano, Didier Queloz, Heike Rauer, Liam Raynard, Alexis MS Smith, Rosanna H Tilbrook, Stephane Udry, Jose I Vines, Christopher A Watson, Richard G West, Peter J Wheatley
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=12.38 mag 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 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.

History

Citation

Monthly Notices of the Royal Astronomical Society, staa2976, https://doi.org/10.1093/mnras/staa2976

Author affiliation

Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP) for Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Copyright date

2020

Available date

28/09/2020

Language

en