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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 AuthorsAuthors ORCID iD
West, Richard G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Gillen, E.Institute of Astronomy, University of Cambridge, United KingdomUNSPECIFIED
Bayliss, DanielUniversity of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Burleigh, M. R.University of Leicester, UKUNSPECIFIED
Delrez, L.Battcock Centre for Experimental Astrophysics, Cambridge, UKUNSPECIFIED
Günther, Maximilian N.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Hodgkin, Simon T.University of CambridgeUNSPECIFIED
Jackman, James A.G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Jenkins, J.Departamento de Astronomía, Universidad de Chile, Santiago, ChileUNSPECIFIED
King, GeorgeCentre for Exoplanets and Habitability, University of Warwick, Coventry, UK ; Dept. of Physics, University of Warwick, Coventry, UKUNSPECIFIED
McCormac, J.Dept. of Physics, University of Warwick, United KingdomUNSPECIFIED
Nielsen, Louise D.Observatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Raynard, L.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, LE1 7RH, UKUNSPECIFIED
Smith, AlexisAlexis.Smith (at) dlr.deUNSPECIFIED
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
Wheatley, P.Dept. of Physics, University of Warwick, United KingdomUNSPECIFIED
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 ArabiaUNSPECIFIED
Armstrong, D. J.University of Warwick, UKUNSPECIFIED
Belardi, C.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Bouchy, F.Observatoire de Genève, Sauverny, SwitzerlandUNSPECIFIED
Briegal, Joshua T.Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Burdanov, ArtemSpace sciences, Technologies and Astrophysics Research (STAR) Institute, Universite de Liege, Liege, BelgiumUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.deUNSPECIFIED
Casewell, SDepartment of Physics, University of Warwick, UKUNSPECIFIED
Chaushev, A.Dept. of Physics and Astronomy, University of Leicester, United KingdomUNSPECIFIED
Chazelas, BObservatory of Geneva University of GenevaUNSPECIFIED
Chote, PaulDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
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, UKUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Ducrot, ElsaSpace sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 17, Bat. B5C, 4000 Liège, BelgiumUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Erikson, Aanders.erikson (at) dlr.deUNSPECIFIED
Foxell, EmmaUniversity of Warwick, Department of PhysicsUNSPECIFIED
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, UKUNSPECIFIED
Gillon, MObservatoire de GenèveUNSPECIFIED
Goad, MDepartment of Physics & Astronomy, University of LeicesterUNSPECIFIED
Jehin, EEuropean Southern ObservatoryUNSPECIFIED
Lambert, GregoryAstrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Longstaff, Emma S.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, UKUNSPECIFIED
Louden, TDepartment of Physics, University of Warwick, UKUNSPECIFIED
Moyano, M.Instituto de Astronomia, Universidad Catolica del Norte, ChileUNSPECIFIED
Murray, C.Astronomy Unit, Queen Mary, University of London, London, UKUNSPECIFIED
Pollacco, D.Department of Physics, University of Warwick, Coventry CV4 7AL, UKUNSPECIFIED
Queloz, D.Institute of Astronomy, University of Cambridge, United KingdomUNSPECIFIED
Rauer, Hheiker.rauer (at) dlr.deUNSPECIFIED
Sohy, SandrineSpace sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 17, Bat. B5C, 4000 Liège, BelgiumUNSPECIFIED
Thompson, Samantha J.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Udry, SObservatoire de GenèveUNSPECIFIED
Walker, SimonDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIED
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 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:17 Jun 2019 15:01
Last Modified:06 Sep 2019 15:17

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