Bryant, EM, Bayliss, D, Nielsen, LD, Veras, D, Acton, JS, Anderson, DR, Armstrong, DJ, Bouchy, F, Briegal, JT, Burleigh, MR, Cabrera, J, Casewell, SL, Chaushev, A, Cooke, BF, Csizmadia, S, Eigmueller, P, Erikson, A, Gill, S, Gillen, E, Goad, MR, Grieves, N, Gunther, MN, Henderson, B, Hogan, A, Jenkins, JS, Lendl, M, McCormac, J, Moyano, M, Queloz, D, Rauer, H, Raynard, L, Smith, AMS, Tilbrook, RH, Udry, S, Vines, JI, Watson, CA, West, RG and Wheatley, PJ (2020) NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit. Monthly Notices of the Royal Astronomical Society, 499 (3). 3139 - 3148. ISSN 0035-8711

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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 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.

Item Type: Article
Additional Information: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics
Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 06 May 2021 13:58
Last Modified: 06 May 2021 13:58

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