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:

Authors	Institution or Email of Authors	Author's ORCID iD
Costes, Jean	Astrophysics Research Centre, School of Mathematics and Physics , Queen’s University Belfast, BT7 1NN Belfast, UK	UNSPECIFIED
Watson, Christopher A.	Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK	UNSPECIFIED
Belardi, Claudia	Department of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UK	UNSPECIFIED
Braker, Ian	Department of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UK	UNSPECIFIED
Burleigh, Matthew	Department of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UK	UNSPECIFIED
Casewell, Sarah L.	Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK	UNSPECIFIED
Eigmüller, Philipp	UNSPECIFIED	https://orcid.org/0000-0003-4096-0594
Günther, Maximilian N.	Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK	UNSPECIFIED
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, UK	UNSPECIFIED
Nielsen, Louise D.	Observatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, Switzerland	UNSPECIFIED
Soto, Maritza	Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile	UNSPECIFIED
Turner, Oliver	Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, Switzerland	UNSPECIFIED
Anderson, David	University of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UK	UNSPECIFIED
Bayliss, Daniel	University of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UK	UNSPECIFIED
Bouchy, Francois	Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, Switzerland	UNSPECIFIED
Briegal, Joshua T.	Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK	UNSPECIFIED
Bryant, Edward	Centre 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, UK	UNSPECIFIED
Cabrera Perez, Juan	UNSPECIFIED	https://orcid.org/0000-0001-6653-5487
Chaushev, Alexander	Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623 Berlin, GermanyCenter for Astronomy and Astrophysics, TU Berlin, Germany	UNSPECIFIED
Csizmadia, Szilard	UNSPECIFIED	UNSPECIFIED
Erikson, Anders	UNSPECIFIED	UNSPECIFIED
Gill, Samuel	Centre 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, UK	UNSPECIFIED
Gillen, Edward	Astrophysics Group, Cavendish Laboratory , J.J. Thomson Avenue, Cambridge CB3 0HE, UK	UNSPECIFIED
Goad, Michael	Department of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UK	UNSPECIFIED
Hodgkin, Simon T.	University of Cambridge	UNSPECIFIED
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, Chile	UNSPECIFIED
McCormac, James	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	UNSPECIFIED
Moyano, Maximiliano	Instituto de Astronomía, Universidad Católica del Norte , Angamos 0610, 1270709 Antofagasta, Chile	UNSPECIFIED
Queloz, Didier	Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK	UNSPECIFIED
Rauer, Heike	UNSPECIFIED	UNSPECIFIED
Raynard, Liam	Department of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UK	UNSPECIFIED
Smith, Alexis	UNSPECIFIED	https://orcid.org/0000-0002-2386-4341
Thompson, Andrew P.G.	Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK	UNSPECIFIED
Tilbrook, Rosanna	Department of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UK	UNSPECIFIED
Udry, Stephane	Observatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, Switzerland	UNSPECIFIED
Vines, Jose	Departamento de Astronomia, Universidad de Chile , Casilla 36-D, Santiago, Chile	UNSPECIFIED
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, UK	UNSPECIFIED
Wheatley, Peter J.	University of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UK	UNSPECIFIED

Date:

January 2020

Journal or Publication Title:

Monthly Notices of the Royal Astronomical Society

Refereed publication:

Yes

Open Access:

Yes

Gold Open Access:

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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