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NGTS-5b: a highly inflated planet offering insights into the sub-Jovian desert

Eigmüller, Philipp and Chaushev, Alexander and Gillen, E. and Smith, Alexis and Nielson, L. and Turner, O. and Csizmadia, Szilard and Smalley, B. and Bayliss, D. and Belardi, C. and Bouchy, F. and Burleigh, M. R. and Cabrera Perez, Juan and Casewell, S and Chazelas, Bruno and Cooke, Benjamin F. and Erikson, Anders and Gänsicke, Boris T. and Günther, Maximilian N. and Goad, M and Grange, A. and Jackman, J. and Jenkins, J. and McCormac, J. and Moyano, M. and Pollacco, D. and Poppenhaeger, K. and Queloz, Didier and Raynard, L. and Rauer, H and Udry, S and Walker, Simon R. and Watson, C. and West, R. G. and Wheatley, P. (2019) NGTS-5b: a highly inflated planet offering insights into the sub-Jovian desert. Astronomy & Astrophysics, 625, A142. EDP Sciences. DOI: 10.1051/0004-6361/201935206 ISSN 0004-6361

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Abstract

Context. Planetary population analysis gives us insight into formation and evolution processes. For short-period planets, the subJovian desert has been discussed in recent years with regard to the planet population in the mass/period and radius/period parameter space without taking stellar parameters into account. The Next Generation Transit Survey (NGTS) is optimised for detecting planets in this regime, which allows for further analysis of the sub-Jovian desert. Aims. With high-precision photometric surveys (e.g. with NGTS and TESS), which aim to detect short period planets especially around M/K-type host stars, stellar parameters need to be accounted for when empirical data are compared to model predictions. Presenting a newly discovered planet at the boundary of the sub-Jovian desert, we analyse its bulk properties and use it to show the properties of exoplanets that border the sub-Jovian desert. Methods. Using NGTS light curve and spectroscopic follow-up observations, we confirm the planetary nature of planet NGTS-5b and determine its mass. Using exoplanet archives, we set the planet in context with other discoveries. Results. NGTS-5b is a short-period planet with an orbital period of 3:3569866 ± 0:0000026 days. With a mass of 0:229 ± 0:037 MJup and a radius of 1:136 ± 0:023 RJup, it is highly inflated. Its mass places it at the upper boundary of the sub-Jovian desert. Because the host is a K2 dwarf, we need to account for the stellar parameters when NGTS-5b is analysed with regard to planet populations. Conclusions. With red-sensitive surveys (e.g. with NGTS and TESS), we expect many more planets around late-type stars to be detected. An empirical analysis of the sub-Jovian desert should therefore take stellar parameters into account.

Item URL in elib:https://elib.dlr.de/127765/
Document Type:Article
Title:NGTS-5b: a highly inflated planet offering insights into the sub-Jovian desert
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Chaushev, AlexanderCenter for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623 Berlin, GermanyCenter for Astronomy and Astrophysics, TU Berlin, GermanyUNSPECIFIED
Gillen, E.Institute of Astronomy, University of Cambridge, United KingdomUNSPECIFIED
Smith, AlexisAlexis.Smith (at) dlr.deUNSPECIFIED
Nielson, L.Université de GenèveUNSPECIFIED
Turner, O.Université de GenèveUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Smalley, B.Astrophysics Group, Keele University, StaffordshireUNSPECIFIED
Bayliss, D.Department of Physics, 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.Universite de Geneve, SwitzerlandUNSPECIFIED
Burleigh, M. R.University of Leicester, UKUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.deUNSPECIFIED
Casewell, SDepartment of Physics, University of Warwick, UKUNSPECIFIED
Chazelas, BrunoUniversite de Geneve, SwitzerlandUNSPECIFIED
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
Erikson, AndersDLR Institut für PlanetenforschungUNSPECIFIED
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
Günther, Maximilian N.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Goad, MDepartment of Physics & Astronomy, University of LeicesterUNSPECIFIED
Grange, A.Dept. of Physics and Astronomy, University of Leicester, United KingdomUNSPECIFIED
Jackman, J.department of physics, university of warwick, ukUNSPECIFIED
Jenkins, J.Departamento de Astronomía, Universidad de Chile, Santiago, ChileUNSPECIFIED
McCormac, J.Dept. of Physics, University of Warwick, United KingdomUNSPECIFIED
Moyano, M.Instituto de Astronomia, Universidad Catolica del Norte, ChileUNSPECIFIED
Pollacco, D.Department of Physics, University of Warwick, Coventry CV4 7AL, UKUNSPECIFIED
Poppenhaeger, K.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN Belfast, UKUNSPECIFIED
Queloz, DidierCambridge University, Cavendish LaboratoryUNSPECIFIED
Raynard, L.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, LE1 7RH, UKUNSPECIFIED
Rauer, Hheiker.rauer (at) dlr.deUNSPECIFIED
Udry, SObservatoire de GenèveUNSPECIFIED
Walker, Simon R.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Watson, C.astrophysics research centre, queens university belfast, united kingdomUNSPECIFIED
West, R. G.Department of Physics, University of Warwick, UKUNSPECIFIED
Wheatley, P.Dept. of Physics, University of Warwick, United KingdomUNSPECIFIED
Date:2019
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:625
DOI :10.1051/0004-6361/201935206
Page Range:A142
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:planets and satellites: detection, planets and satellites: gaseous planets, 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:13 Jun 2019 10:31
Last Modified:13 Jun 2019 10:31

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