Article (Scientific journals)
NGTS-4b: A sub-Neptune Transiting in the Desert
West, Richard G.; Gillen, Edward; Bayliss, Daniel et al.
2019In Monthly Notices of the Royal Astronomical Society, 486, p. 5094-5103
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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We report the discovery of NGTS-4b, a sub-Neptune-sized planet transiting a 13th magnitude K-dwarf in a 1.34d orbit. NGTS-4b has a mass M=$20.6\pm3.0$M_E and radius R=$3.18\pm0.26$R_E, which places it well within the so-called "Neptunian Desert". The mean density of the planet ($3.45\pm0.95$g/cm^3) is consistent with a composition of 100% H$_2$O 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 $0.13\pm0.02$%, 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
West, Richard G.
Gillen, Edward
Bayliss, Daniel
Burleigh, Matthew R.
Delrez, Laetitia ;  University of Cambridge > Cavendish Laboratory
Günther, Maximilian N.
Hodgkin, Simon T.
Jackman, James A. G.
Jenkins, James S.
King, George
McCormac, James
Nielsen, Louise D.
Raynard, Liam
Smith, Alexis M. S.
Soto, Maritza
Turner, Oliver
Wheatley, Peter J.
Almleaky, Yaseen
Armstrong, David J.
Belardi, Claudia
Bouchy, François
Briegal, Joshua T.
Burdanov, Artem ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Cabrera, Juan
Casewel, Sarah L.
Chaushev, Alexander
Chazelas, Bruno
Chote, Paul
Cooke, Benjamin F.
Csizmadia, Szilard
Ducrot, Elsa ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Eigmüller, Philipp
Erikson, Anders
Foxell, Emma
Gänsicke, Boris T.
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Goad, Michael R.
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Lambert, Gregory
Longstaff, Emma S.
Louden, Tom
Moyano, Maximiliano
Murray, Catriona
Pollacco, Don
Queloz, Didier
Rauer, Heike
Sohy, Sandrine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Thompson, Samantha J.
Udry, Stéphane
Walker, Simon R.
Watson, Christopher A.
More authors (41 more) Less
Language :
English
Title :
NGTS-4b: A sub-Neptune Transiting in the Desert
Publication date :
01 July 2019
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
486
Pages :
5094-5103
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Published in MNRAS
Available on ORBi :
since 28 February 2019

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