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NGTS-4b: A sub-Neptune transiting in the desert

West, Richard G. and Gillen, E. and Bayliss, Daniel and Burleigh, M. R. and Delrez, L. and Günther, Maximilian N. and Hodgkin, Simon T. and Jackman, James A.G. and Jenkins, J. and King, George and McCormac, J. and Nielsen, Louise D. and Raynard, L. and Smith, Alexis and Soto, Maritza and Turner, Oliver and Wheatley, P. and Almleaky, Yaseen and Armstrong, D. J. and Belardi, C. and Bouchy, F. and Briegal, Joshua T. and Burdanov, Artem and Cabrera Perez, Juan and Casewell, S and Chaushev, A. and Chazelas, B and Chote, Paul and Cooke, Benjamin F. and Csizmadia, Szilard and Ducrot, Elsa and Eigmüller, Philipp and Erikson, A and Foxell, Emma and Gänsicke, Boris T. and Gillon, M and Goad, M and Jehin, E and Lambert, Gregory and Longstaff, Emma S. and Louden, T and Moyano, M. and Murray, C. and Pollacco, D. and Queloz, D. and Rauer, H and Sohy, Sandrine and Thompson, Samantha J. and Udry, S and Walker, Simon and Watson, Christopher A. (2019) NGTS-4b: A sub-Neptune transiting in the desert. Monthly Notices of the Royal Astronomical Society, 486 (4), pp. 5094-5103. Oxford University Press. doi: 10.1093/mnras/stz1084. ISSN 0035-8711.

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Abstract

We report the discovery of NGTS-4b, a sub-Neptune-sized planet transiting a 13th magnitude K-dwarf in a 1.34 d orbit. NGTS-4b has a mass M=20.6 ± 3.0 M⊕ and radius R=3.18 ± 0.26 R⊕, which places it well within the so-called "Neptunian Desert". The mean density of the planet (3.45 ± 0.95 g cm-3) is consistent with a composition of 100 % H2O or a rocky core with a volatile envelope. NGTS-4b is likely to suffer significant mass loss due to relatively strong EUV/X-ray irradiation. Its survival in the Neptunian desert may be due to an unusually high core mass, or it may have avoided the most intense X-ray irradiation by migrating after the initial activity of its host star had subsided. With a transit depth of 0.13 ± 0.02%, NGTS-4b represents the shallowest transiting system ever discovered from the ground, and is the smallest planet discovered in a wide-field ground-based photometric survey.

Item URL in elib:https://elib.dlr.de/127786/
Document Type:Article
Title:NGTS-4b: A sub-Neptune transiting in the desert
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
West, Richard G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Gillen, E.Institute of Astronomy, University of Cambridge, United KingdomUNSPECIFIEDUNSPECIFIED
Bayliss, DanielUniversity of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Burleigh, M. R.University of Leicester, UKUNSPECIFIEDUNSPECIFIED
Delrez, L.Battcock Centre for Experimental Astrophysics, Cambridge, UKUNSPECIFIEDUNSPECIFIED
Günther, Maximilian N.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIEDUNSPECIFIED
Hodgkin, Simon T.University of CambridgeUNSPECIFIEDUNSPECIFIED
Jackman, James A.G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Jenkins, J.Departamento de Astronomía, Universidad de Chile, Santiago, ChileUNSPECIFIEDUNSPECIFIED
King, GeorgeCentre for Exoplanets and Habitability, University of Warwick, Coventry, UK ; Dept. of Physics, University of Warwick, Coventry, UKUNSPECIFIEDUNSPECIFIED
McCormac, J.Dept. of Physics, University of Warwick, United KingdomUNSPECIFIEDUNSPECIFIED
Nielsen, Louise D.Observatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Raynard, L.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Smith, AlexisUNSPECIFIEDhttps://orcid.org/0000-0002-2386-4341UNSPECIFIED
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
Wheatley, P.Dept. of Physics, University of Warwick, United KingdomUNSPECIFIEDUNSPECIFIED
Almleaky, YaseenSpace and Astronomy Department, Faculty of Science, King Abdulaziz University, 21589 Jeddah, Saudi Arabia; King Abdullah Centre for Crescent Observations and Astronomy, Makkah Clock, Mecca 24231, Saudi ArabiaUNSPECIFIEDUNSPECIFIED
Armstrong, D. J.University of Warwick, UKUNSPECIFIEDUNSPECIFIED
Belardi, C.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIEDUNSPECIFIED
Bouchy, F.Observatoire de Genève, Sauverny, SwitzerlandUNSPECIFIEDUNSPECIFIED
Briegal, Joshua T.Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIEDUNSPECIFIED
Burdanov, ArtemSpace sciences, Technologies and Astrophysics Research (STAR) Institute, Universite de Liege, Liege, BelgiumUNSPECIFIEDUNSPECIFIED
Cabrera Perez, JuanUNSPECIFIEDhttps://orcid.org/0000-0001-6653-5487UNSPECIFIED
Casewell, SDepartment of Physics, University of Warwick, UKUNSPECIFIEDUNSPECIFIED
Chaushev, A.Dept. of Physics and Astronomy, University of Leicester, United KingdomUNSPECIFIEDUNSPECIFIED
Chazelas, BObservatory of Geneva University of GenevaUNSPECIFIEDUNSPECIFIED
Chote, PaulDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Cooke, Benjamin F.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
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ducrot, ElsaSpace sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 17, Bat. B5C, 4000 Liège, BelgiumUNSPECIFIEDUNSPECIFIED
Eigmüller, PhilippUNSPECIFIEDhttps://orcid.org/0000-0003-4096-0594UNSPECIFIED
Erikson, AUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Foxell, EmmaUniversity of Warwick, Department of PhysicsUNSPECIFIEDUNSPECIFIED
Gänsicke, Boris T.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
Gillon, MObservatoire de GenèveUNSPECIFIEDUNSPECIFIED
Goad, MDepartment of Physics & Astronomy, University of LeicesterUNSPECIFIEDUNSPECIFIED
Jehin, EEuropean Southern ObservatoryUNSPECIFIEDUNSPECIFIED
Lambert, GregoryAstrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIEDUNSPECIFIED
Longstaff, Emma S.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, UKUNSPECIFIEDUNSPECIFIED
Louden, TDepartment of Physics, University of Warwick, UKUNSPECIFIEDUNSPECIFIED
Moyano, M.Instituto de Astronomia, Universidad Catolica del Norte, ChileUNSPECIFIEDUNSPECIFIED
Murray, C.Astronomy Unit, Queen Mary, University of London, London, UKUNSPECIFIEDUNSPECIFIED
Pollacco, D.Department of Physics, University of Warwick, Coventry CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Queloz, D.Institute of Astronomy, University of Cambridge, United KingdomUNSPECIFIEDUNSPECIFIED
Rauer, HUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sohy, SandrineSpace sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 17, Bat. B5C, 4000 Liège, BelgiumUNSPECIFIEDUNSPECIFIED
Thompson, Samantha J.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIEDUNSPECIFIED
Udry, SObservatoire de GenèveUNSPECIFIEDUNSPECIFIED
Walker, SimonDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIEDUNSPECIFIED
Date: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
Volume:486
DOI:10.1093/mnras/stz1084
Page Range:pp. 5094-5103
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:techniques: photometric, planets and satellites: detection, stars: individual: NGTS-4- planetary systems, 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 (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:17 Jun 2019 15:01
Last Modified:28 Jun 2023 13:52

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