Volume 646, February 2021
|Number of page(s)||11|
|Section||Planets and planetary systems|
|Published online||26 February 2021|
NGTS-14Ab: a Neptune-sized transiting planet in the desert★
Institute of Planetary Research, German Aerospace Center,
2 School of Physics and Astronomy, University of Leicester, LE1 7RH, UK
3 Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
4 Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
5 Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
6 Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av.Diagonal las Torres 2640, Peñalolén, Santiago, Chile
7 Millennium Institute for Astrophysics, Santiago, Chile
8 Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
9 Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
10 Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, BT7 1NN Belfast, UK
11 Astronomy Unit, Queen Mary University of London, Mile End Road, London E1 4NS, UK
12 Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Mass. Ave, Cambridge, MA 02139, USA
13 Instituto de Astronomía, Universidad Católica del Norte, Angamos 0610, 1270709 Antofagasta, Chile
14 Institute of Geological Sciences, FU Berlin, Malteserstr. 74-100, 12249 Berlin, Germany
15 Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile
Accepted: 5 January 2020
Context. The sub-Jovian, or Neptunian, desert is a previously identified region of parameter space where there is a relative dearth of intermediate-mass planets with short orbital periods.
Aims. We present the discovery of a new transiting planetary system within the Neptunian desert, NGTS-14.
Methods. Transits of NGTS-14Ab were discovered in photometry from the Next Generation Transit Survey (NGTS). Follow-up transit photometry was conducted from several ground-based facilities, as well as extracted from TESS full-frame images. We combine radial velocities from the HARPS spectrograph with the photometry in a global analysis to determine the system parameters.
Results. NGTS-14Ab has a radius that is about 30 per cent larger than that of Neptune (0.444 ± 0.030 RJup) and is around 70 per cent more massive than Neptune (0.092 ± 0.012 MJup). It transits the main-sequence K1 star, NGTS-14A, with a period of 3.54 days, just far away enough to have maintained at least some of its primordial atmosphere. We have also identified a possible long-period stellar mass companion to the system, NGTS-14B, and we investigate the binarity of exoplanet host stars inside and outside the Neptunian desert using Gaia.
Key words: planetary systems / planets and satellites: detection / planets and satellites: individual: NGTS-14Ab / binaries: general
Full Table 2 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/646/A183
© ESO 2021
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