NGTS-4b : a sub-Neptune transiting in the desert
- West, Richard G.
- Gillen, Edward
- Bayliss, Daniel D. R.
- Burleigh, Matthew R.
- Delrez, Laetitia
- Günther, Maximilian N.
- Hodgkin, Simon T.
- Jackman, James A. G.
- Jenkins, James S.
- King, George W.
- McCormac, J. J.
- 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
- Cabrera, Juan
- Casewell, Sarah L.
- Chaushev, Alexander
- Chazelas, Bruno
- Chote, Paul
- Cooke, Benjamin F.
- Csizmadia, Szilard
- Ducrot, Elsa
- Eigmüller, Philipp
- Erikson, Anders
- Foxell, Emma
- Gänsicke, Boris T.
- Gillon, Michaël
- Goad, Michael R.
- Jehin, Emmanuël
- Lambert, Gregory
- Longstaff, Emma S.
- Louden, Tom M.
- Moyano, Maximiliano
- Murray, Catriona
- Pollacco, Don
- Queloz, Didier
- Rauer, Heike
- Sohy, Sandrine
- Thompson, Samantha J.
- Udry, Stéphane
- Walker, Simon R.
- Watson, Christopher A.
DOIAbstract
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 th...
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