NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit-Reference-Cited by-同舟云学术

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

Published:2020-09-28 Issue:3 Volume:499 Page:3139-3148
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Bryant Edward M¹²,Bayliss Daniel¹²^ORCID,Nielsen Louise D³^ORCID,Veras Dimitri¹²^ORCID,Acton Jack S⁴,Anderson David R¹²^ORCID,Armstrong David J¹²^ORCID,Bouchy François³,Briegal Joshua T⁵,Burleigh Matthew R⁴,Cabrera Juan⁶,Casewell Sarah L⁴,Chaushev Alexander⁷,Cooke Benjamin F¹²^ORCID,Csizmadia Szilárd⁶^ORCID,Eigmüller Philipp⁶,Erikson Anders⁶,Gill Samuel¹²,Gillen Edward⁸⁵^ORCID,Goad Michael R⁴,Grieves Nolan³,Günther Maximilian N⁹,Henderson Beth⁴,Hogan Aleisha⁴,Jenkins James S¹⁰¹¹^ORCID,Lendl Monika³^ORCID,McCormac James¹²,Moyano Maximiliano¹²,Queloz Didier⁵,Rauer Heike⁶⁷,Raynard Liam⁴,Smith Alexis M S⁶,Tilbrook Rosanna H⁴,Udry Stéphane³,Vines Jose I¹⁰^ORCID,Watson Christopher A¹³,West Richard G¹²^ORCID,Wheatley Peter J¹²^ORCID

Affiliation:

1. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK

2. Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK

3. Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, CH-1290 Sauverny, Switzerland

4. School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK

5. Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK

6. Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany

7. Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr 36, D-10623 Berlin, Germany

8. Astronomy Unit, Queen Mary University of London, Mile End Road, London E1 4NS, UK

9. Department of Physics, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

10. Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile

11. Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, Chile

12. Instituto de Astronomía, Universidad Católica del Norte, Casa Central, Angamos 0610, Antofagasta 1270709, Chile

13. Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, UK

Abstract

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 = 12.38 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.

Funder

European Southern Observatory

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa2976/33799004/staa2976.pdf

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