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Title: NGTS-4b: A sub-Neptune Transiting in the Desert
Authors: West, RG
Gillen, E
Bayliss, D
Burleigh, MR
Delrez, L
Günther, MN
Hodgkin, ST
Jackman, JAG
Jenkins, JS
King, G
McCormac, J
Nielsen, LD
Raynard, L
Smith, AMS
Soto, M
Turner, O
Wheatley, PJ
Almleaky, Y
Armstrong, DJ
Belardi, C
Bouchy, F
Briegal, JT
Burdanov, A
Cabrera, J
Casewel, SL
Chaushev, A
Chazelas, B
Chote, P
Cooke, BF
Csizmadia, S
Ducrot, E
Eigmüller, P
Erikson, A
Foxell, E
Gänsicke, BT
Gillon, M
Goad, MR
Jehin, E
Lambert, G
Longstaff, ES
Louden, T
Moyano, M
Murray, C
Pollacco, D
Queloz, D
Rauer, H
Sohy, S
Thompson, SJ
Udry, S
Walker, SR
Watson, CA
First Published: 20-Apr-2019
Publisher: Oxford University Press (OUP), Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2019, 486(4), pp. 5094–5103
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 per cent 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 per cent, 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.
DOI Link: 10.1093/mnras/stz1084
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2019, Oxford University Press (OUP), Royal Astronomical Society. Deposited with reference to the publisher’s open access archiving policy. (
Description: Supplementary data are available at MNRAS online. Table 1. Summary of NGTS photometry of NGTS-4. Table 3. HARPS Radial Velocities for NGTS-4.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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