Title: NGTS-6b: an ultrashort period hot-Jupiter orbiting an old K dwarf

Abstract

ABSTRACT We report the discovery of a new ultrashort period hot Jupiter from the Next Generation Transit Survey. NGTS-6b orbits its star with a period of 21.17 h, and has a mass and radius of $$1.330^{+0.024}_{-0.028}$$MJ and $$1.271^{+0.197}_{-0.188}$$RJ, respectively, returning a planetary bulk density of $$0.711^{+0.214}_{-0.136}$$ g cm−3. Conforming to the currently known small population of ultrashort period hot Jupiters, the planet appears to orbit a metal-rich star ([Fe/H] = +0.11 ± 0.09 dex). Photoevaporation models suggest the planet should have lost 5 per cent of its gaseous atmosphere over the course of the 9.6 Gyr of evolution of the system. NGTS-6b adds to the small, but growing list of ultrashort period gas giant planets, and will help us to understand the dominant formation and evolutionary mechanisms that govern this population.

Authors:

Vines, Jose I. ^[1]; Jenkins, James S. ^[2]; Acton, Jack S. ^[3]; Briegal, Joshua ^[4]; Bayliss, Daniel  ^[5];

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Bouchy, François ^[6]; Belardi, Claudia ^[3]; Bryant, Edward M. ^[7]; Burleigh, Matthew R. ^[3]; Cabrera, Juan ^[8]; Casewell, Sarah L. ^[3]; Chaushev, Alexander ^[9]; Cooke, Benjamin F. ^[7]; Csizmadia, Szilárd  ^[8];

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Eigmüller, Philipp ^[8]; Erikson, Anders ^[8]; Foxell, Emma ^[5]; Gill, Samuel ^[7]; Gillen, Edward  ^[10];

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Goad, Michael R. ^[3] more »; Jackman, James A. G.  ^[7];

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King, George W. ^[7]; Louden, Tom  ^[7];

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McCormac, James ^[7]; Moyano, Maximiliano ^[11]; Nielsen, Louise D.  ^[6];

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Pollacco, Don ^[7]; Queloz, Didier ^[12]; Rauer, Heike ^[13]; Raynard, Liam  ^[3];

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Smith, Alexis M. S. ^[8]; Soto, Maritza G. ^[14]; Tilbrook, Rosanna H. ^[3]; Titz-Weider, Ruth ^[8]; Turner, Oliver  ^[6];

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Udry, Stéphane ^[6]; Walker, Simon R. ^[5]; Watson, Christopher A. ^[12]; West, Richard G.  ^[7];

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Wheatley, Peter J.  ^[7]

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+ Show Author Affiliations

1. Departamento de Astronomía, Universidad de Chile, Casilla 36-D, 7591245, Santiago, Chile
2. Departamento de Astronomía, Universidad de Chile, Casilla 36-D, 7591245, Santiago, Chile, Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, 7591245, Santiago, Chile
3. Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
4. Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
5. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
6. Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, Switzerland
7. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK, Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
8. Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany
9. Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany
10. Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
11. Instituto de Astronomía, Universidad Católica del Norte, Angamos 0610, 1270709 Antofagasta, Chile
12. Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, UK
13. Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany, Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany, Institute of Geological Sciences, FU Berlin, Malteserstr. 74-100, D-12249 Berlin, Germany
14. School of Physics and Astronomy, Queen Mary University, 327 Mile End Road, London E1 4NS, UK

Publication Date:

2019-08-27

Sponsoring Org.:

USDOE

OSTI Identifier:

1562558

Resource Type:

Published Article

Journal Name:

Monthly Notices of the Royal Astronomical Society

Additional Journal Information:

Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 489 Journal Issue: 3; Journal ID: ISSN 0035-8711

Publisher:

Oxford University Press

Country of Publication:

United Kingdom

Language:

English