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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. (2020) NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters. Monthly Notices of the Royal Astronomical Society, 491 (1), pp. 2834-2844. Oxford University Press. doi: 10.1093/mnras/stz3140. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/491/2/2834/5634272

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 AuthorsAuthor's ORCID iDORCID Put Code
Costes, JeanAstrophysics Research Centre, School of Mathematics and Physics , Queen’s University Belfast, BT7 1NN Belfast, UKUNSPECIFIEDUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIEDUNSPECIFIED
Belardi, ClaudiaDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Braker, IanDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Burleigh, MatthewDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Casewell, Sarah L.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Eigmüller, PhilippUNSPECIFIEDhttps://orcid.org/0000-0003-4096-0594UNSPECIFIED
Günther, Maximilian N.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIEDUNSPECIFIED
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, UKUNSPECIFIEDUNSPECIFIED
Nielsen, Louise D.Observatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Soto, MaritzaDepartamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, ChileUNSPECIFIEDUNSPECIFIED
Turner, OliverObservatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Anderson, DavidUniversity of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Bayliss, DanielUniversity of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Bouchy, FrancoisObservatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Briegal, Joshua T.Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIEDUNSPECIFIED
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, UKUNSPECIFIEDUNSPECIFIED
Cabrera Perez, JuanUNSPECIFIEDhttps://orcid.org/0000-0001-6653-5487UNSPECIFIED
Chaushev, AlexanderCenter for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623 Berlin, GermanyCenter for Astronomy and Astrophysics, TU Berlin, GermanyUNSPECIFIEDUNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, AndersUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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, UKUNSPECIFIEDUNSPECIFIED
Gillen, EdwardAstrophysics Group, Cavendish Laboratory , J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIEDUNSPECIFIED
Goad, MichaelDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Hodgkin, Simon T.University of CambridgeUNSPECIFIEDUNSPECIFIED
Hooton, Matthew(Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN Belfast, UK);UNSPECIFIEDUNSPECIFIED
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, ChileUNSPECIFIEDUNSPECIFIED
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, UKUNSPECIFIEDUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte , Angamos 0610, 1270709 Antofagasta, ChileUNSPECIFIEDUNSPECIFIED
Queloz, DidierAstrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIEDUNSPECIFIED
Rauer, HeikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Raynard, LiamDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Smith, AlexisUNSPECIFIEDhttps://orcid.org/0000-0002-2386-4341UNSPECIFIED
Thompson, Andrew P.G.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIEDUNSPECIFIED
Tilbrook, RosannaDepartment of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Udry, StephaneObservatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Vines, JoseDepartamento de Astronomia, Universidad de Chile , Casilla 36-D, Santiago, ChileUNSPECIFIEDUNSPECIFIED
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, UKUNSPECIFIEDUNSPECIFIED
Wheatley, Peter J.University of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Date:January 2020
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
Volume:491
DOI:10.1093/mnras/stz3140
Page Range:pp. 2834-2844
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 Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO (old)
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:28 Mar 2023 23:55

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