Artículo de revista
NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit
Fecha
2020Registro en:
Monthly Notices of the Royal Astronomical Society Volumen: 499 Número: 3 Páginas: 3139-3148 Dec 2020
10.1093/mnras/staa2976
Autor
Bryant, Edward M.
Bayliss, Daniel
Nielsen, Louise D.
Veras, Dimitri
Acton, Jack S.
Anderson, David R.
Armstrong, David J.
Bouchy, Fracois
Briegal, Joshua T.
Burleigh, Matthew R.
Cabrera, Juan
Casewell, Sarah L.
Chaushev, Alexander
Cooke, Benjamin F
Csizmadia, Szilard
Eigmueller, Philipp
Erikson, Anders
Gill, Samuel
Gillen, Edward
Goad, Michael R.
Grieves, Nolan
Gunther, Maximilian N.
Henderson, Beth
Hogan, Aleisha
Jenkins, James S.
Lendl, Monika
McCormac, J.
Moyano, Maximiliano
Queloz, Didier
Rauer, Heike
Raynard, Liam
Smith, Alexis M. S.
Tilbrook, Rossanna H.
Udry, Stéphane
Vines, Jose I.
Watson, Christopher A.
West, Richard G.
Wheatley, Peter J.
Institución
Resumen
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 T-eff = 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 M-J and a radius of 1.048 +/- 0.032 R-J. 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.