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NGTS-21b: an inflated Super-Jupiter orbiting a metal-poor K dwarf

Alves, Douglas R. and Jenkins, James S and Vines, Jose I and Nielsen, Louise D and Gill, Samuel and Acton, Jack S and Anderson, D R and Bayliss, Daniel and Bouchy, François and Breytenbach, Hannes and Bryant, Edward M and Burleigh, Matthew R and Casewell, Sarah L and Eigmüller, Philipp and Gillen, Edward and Goad, Michael R and Günther, Maximilian N and Henderson, Beth A and Kendall, Alicia and Lendl, Monika and Moyano, Maximiliano and Sefako, Ramotholo R and Smith, Alexis M S and Costes, Jean C and Tilbrook, Rosanne H and Thomas, Jessymol K and Udry, Stéphane and Watson, Christopher A and West, Richard G and Wheatley, Peter J and Worters, Hannah L and Osborn, Ares (2022) NGTS-21b: an inflated Super-Jupiter orbiting a metal-poor K dwarf. Monthly Notices of the Royal Astronomical Society, 517 (3), pp. 4447-4457. Oxford University Press. doi: 10.1093/mnras/stac2884. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/517/3/4447/6753214

Abstract

We report the discovery of NGTS-21b , a massive hot Jupiter orbiting a low-mass star as part of the Next Generation Transit Survey (NGTS). The planet has a mass and radius of 2.36 ± 0.21 MJ and 1.33 ± 0.03 RJ, and an orbital period of 1.543 d. The host is a K3V (Teff = 4660 ± 41 K) metal-poor ([Fe/H] = -0.26 ± 0.07 dex) dwarf star with a mass and radius of 0.72 ± 0.04 M⊙ and 0.86 ± 0.04R⊙. Its age and rotation period of 10.02+3.29−7.30 Gyr and 17.88 ± 0.08 d, respectively, are in accordance with the observed moderately low-stellar activity level. When comparing NGTS-21b with currently known transiting hot Jupiters with similar equilibrium temperatures, it is found to have one of the largest measured radii despite its large mass. Inflation-free planetary structure models suggest the planet's atmosphere is inflated by ∼21 per cent, while inflationary models predict a radius consistent with observations, thus pointing to stellar irradiation as the probable origin of NGTS-21b's radius inflation. Additionally, NGTS-21b's bulk density (1.25 ± 0.15 g cm-3) is also amongst the largest within the population of metal-poor giant hosts ([Fe/H] < 0.0), helping to reveal a falling upper boundary in metallicity-planet density parameter space that is in concordance with core accretion formation models. The discovery of rare planetary systems such as NGTS-21 greatly contributes towards better constraints being placed on the formation and evolution mechanisms of massive planets orbiting low-mass stars.

Item URL in elib:https://elib.dlr.de/189769/
Document Type:Article
Title:NGTS-21b: an inflated Super-Jupiter orbiting a metal-poor K dwarf
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Alves, Douglas R.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, 7591245, Santiago, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, 7591245, Santiago, ChileUNSPECIFIED
Jenkins, James Sentro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, 7591245, Santiago, Chile; Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército 441 Santiago, ChileUNSPECIFIED
Vines, Jose IDepartamento de Astronomía, Universidad de Chile, Casilla 36-D, 7591245, Santiago, ChileUNSPECIFIED
Nielsen, Louise DEuropean Southern Observatory (ESO), Karl-Schwarzschild-Straße 2, D-85748 Garching bei München, GermanyUNSPECIFIED
Gill, SamuelDepartment 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
Acton, Jack SSchool of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKUNSPECIFIED
Anderson, D RDepartment 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
Bayliss, DanielDepartment 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
Bouchy, FrançoisDepartement d'Astronomie, Université de Genève, 51 chemin Pegasi, CH-1290 Sauverny, SwitzerlandUNSPECIFIED
Breytenbach, HannesSouth African Astronomical Observatory, PO Box 9, Observatory 7935 Cape Town, South Africa; Department of Astronomy, University of Cape Town, Rondebosch 7700 Cape Town, South AfricaUNSPECIFIED
Bryant, Edward MMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIED
Burleigh, Matthew RSchool of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKUNSPECIFIED
Casewell, Sarah LSchool of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Gillen, EdwardAstronomy Unit, Queen Mary University of London, Mile End Road, London E1 4NS, UK; Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Goad, Michael RSchool of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKUNSPECIFIED
Günther, Maximilian NEuropean Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, NL-2201 AZ Noordwijk, the NetherlandsUNSPECIFIED
Henderson, Beth ASchool of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKUNSPECIFIED
Kendall, AliciaSchool of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKUNSPECIFIED
Lendl, MonikaDepartement d'Astronomie, Université de Genève, 51 chemin Pegasi, CH-1290 Sauverny, SwitzerlandUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte, Casa Central, Angamos 0610 Antofagasta, ChileUNSPECIFIED
Sefako, Ramotholo RDepartment of Astronomy, University of Cape Town, Rondebosch 7700 Cape Town, South AfricaUNSPECIFIED
Smith, Alexis M SAlexis.Smith (at) dlr.dehttps://orcid.org/0000-0002-2386-4341
Costes, Jean CAix Marseille Univ, CNRS, CNES, LAM, Marseille, 13388, FranceUNSPECIFIED
Tilbrook, Rosanne HSchool of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKUNSPECIFIED
Thomas, Jessymol KDepartment of Astronomy, University of Cape Town, Rondebosch 7700 Cape Town, South AfricaUNSPECIFIED
Udry, StéphaneDepartement d'Astronomie, Université de Genève, 51 chemin Pegasi, CH-1290 Sauverny, SwitzerlandUNSPECIFIED
Watson, Christopher AAstrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN Belfast, UKUNSPECIFIED
West, Richard GDepartment 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 JDepartment 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
Worters, Hannah LDepartment of Astronomy, University of Cape Town, Rondebosch 7700 Cape Town, South AfricaUNSPECIFIED
Osborn, AresDepartment 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
Date:December 2022
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:517
DOI:10.1093/mnras/stac2884
Page Range:pp. 4447-4457
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:techniques: photometric; techniques: radial velocities; planets and satellites: detection; planets and satellites: fundamental parameters; planets and satellites: general; stars: general; Astrophysics - Earth and Planetary Astrophysics
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 - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Eigmüller, Dr. Philipp
Deposited On:08 Nov 2022 07:45
Last Modified:08 Nov 2022 07:45

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