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NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters

Costes, Jean and Watson, Christopher A. and Belardi, Claudia and Braker, Ian and Burleigh, Matthew and Casewell, Sarah L. and Eigmüller, Philipp and Günther, Maximilian N. and Jackman, James A. G. and Nielsen, Louise D. and Soto, Maritza and Turner, Oliver and Anderson, David and Bayliss, Daniel and Bouchy, Francois and Briegal, Joshua T. and Bryant, Edward and Cabrera Perez, Juan and Chaushev, Alexander and Csizmadia, Szilard and Erikson, Anders and Gill, Samuel and Gillen, Edward and Goad, Michael and Hodgkin, Simon T. and Hooton, Matthew and Jenkins, James S. and McCormac, James and Moyano, Maximiliano and Queloz, Didier and Rauer, Heike and Raynard, Liam and Smith, Alexis and Thompson, Andrew P.G. and Tilbrook, Rosanna and Udry, Stephane and Vines, Jose and West, Richard G. and Wheatley, Peter J. (2019) NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters. Monthly Notices of the Royal Astronomical Society, p. 2767. Oxford University Press. DOI: 10.1093/mnras/stz3140 ISSN 0035-8711

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Abstract

We report the discovery, by the Next Generation Transit Survey (NGTS), of two hot-Jupiters NGTS-8b and NGTS-9b. These orbit a V = 13.68 K0V star (Teff = 5241 ± 50 K) with a period of 2.49970 days, and a V = 12.80 F8V star (Teff = 6330 ± 130 K) in 4.43527 days, respectively. The transits were independently verified by follow-up photometric observations with the SAAO 1.0-m and Euler telescopes, and we report on the planetary parameters using HARPS, FEROS and CORALIE radial velocities. NGTS-8b has a mass, 0.93 ^{+0.04}_{-0.03} MJ and a radius, 1.09 ± 0.03 RJ similar to Jupiter, resulting in a density of 0.89 ^{+0.08}_{-0.07} g cm-3. This is in contrast to NGTS-9b, which has a mass of 2.90 ± 0.17 MJ and a radius of 1.07 ± 0.06 RJ, resulting in a much greater density of 2.93^{+0.53}_{-0.49} g cm-3. Statistically, the planetary parameters put both objects in the regime where they would be expected to exhibit larger than predicted radii. However, we find that their radii are in agreement with predictions by theoretical non-inflated models.

Item URL in elib:https://elib.dlr.de/131543/
Document Type:Article
Title:NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Costes, JeanAstrophysics Research Centre, School of Mathematics and Physics , Queen’s University Belfast, BT7 1NN Belfast, UKUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIED
Belardi, ClaudiaDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIED
Braker, IanDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIED
Burleigh, MatthewDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIED
Casewell, Sarah L.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Günther, Maximilian N.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Jackman, James A. G.epartment 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, UKUNSPECIFIED
Nielsen, Louise D.Observatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Soto, MaritzaDepartamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, ChileUNSPECIFIED
Turner, OliverObservatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, SwitzerlandUNSPECIFIED
Anderson, DavidUniversity of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Bayliss, DanielUniversity of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Bouchy, FrancoisObservatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, SwitzerlandUNSPECIFIED
Briegal, Joshua T.Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Bryant, EdwardCentre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UK Dept. of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.dehttps://orcid.org/0000-0001-6653-5487
Chaushev, AlexanderCenter for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623 Berlin, GermanyCenter for Astronomy and Astrophysics, TU Berlin, GermanyUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Erikson, Andersanders.erikson (at) dlr.deUNSPECIFIED
Gill, SamuelCentre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UK Dept. of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Gillen, EdwardAstrophysics Group, Cavendish Laboratory , J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Goad, MichaelDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIED
Hodgkin, Simon T.University of CambridgeUNSPECIFIED
Hooton, Matthew(Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN Belfast, UK);UNSPECIFIED
Jenkins, James S.Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, ChileUNSPECIFIED
McCormac, JamesDepartment 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, UKUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte , Angamos 0610, 1270709 Antofagasta, ChileUNSPECIFIED
Queloz, DidierAstrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Rauer, Heikeheike.rauer (at) dlr.deUNSPECIFIED
Raynard, LiamDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIED
Smith, AlexisAlexis.Smith (at) dlr.deUNSPECIFIED
Thompson, Andrew P.G.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIED
Tilbrook, RosannaDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIED
Udry, StephaneObservatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Vines, JoseDepartamento de Astronomia, Universidad de Chile , Casilla 36-D, Santiago, ChileUNSPECIFIED
West, Richard G.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, UKUNSPECIFIED
Wheatley, Peter J.University of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Date:November 2019
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1093/mnras/stz3140
Page Range:p. 2767
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:techniques: photometric, stars: individual: NGTS-8 and NGTS-9 planetary systems, planets and satellites: detection
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Project PLATO
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Eigmüller, Dr. Philipp
Deposited On:02 Dec 2019 14:35
Last Modified:02 Dec 2019 14:35

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