NGTS-6b: an ultrashort period hot-Jupiter orbiting an old K dwarf

ABSTRACT We report the discovery of a new ultrashort period hot Jupiter from the Next Generation Transit Survey. NGTS-6b orbits its star with a period of 21.17 h, and has a mass and radius of $1.330^{+0.024}_{-0.028}$MJ and $1.271^{+0.197}_{-0.188}$RJ, respectively, returning a planetary bulk densit...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2019-11, Vol.489 (3), p.4125-4134
Hauptverfasser: Vines, Jose I, Jenkins, James S, Acton, Jack S, Briegal, Joshua, Bayliss, Daniel, Bouchy, François, Belardi, Claudia, Bryant, Edward M, Burleigh, Matthew R, Cabrera, Juan, Casewell, Sarah L, Chaushev, Alexander, Cooke, Benjamin F, Csizmadia, Szilárd, Eigmüller, Philipp, Erikson, Anders, Foxell, Emma, Gill, Samuel, Gillen, Edward, Goad, Michael R, Jackman, James A G, King, George W, Louden, Tom, McCormac, James, Moyano, Maximiliano, Nielsen, Louise D, Pollacco, Don, Queloz, Didier, Rauer, Heike, Raynard, Liam, Smith, Alexis M S, Soto, Maritza G, Tilbrook, Rosanna H, Titz-Weider, Ruth, Turner, Oliver, Udry, Stéphane, Walker, Simon R, Watson, Christopher A, West, Richard G, Wheatley, Peter J
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Sprache:eng
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Zusammenfassung:ABSTRACT We report the discovery of a new ultrashort period hot Jupiter from the Next Generation Transit Survey. NGTS-6b orbits its star with a period of 21.17 h, and has a mass and radius of $1.330^{+0.024}_{-0.028}$MJ and $1.271^{+0.197}_{-0.188}$RJ, respectively, returning a planetary bulk density of $0.711^{+0.214}_{-0.136}$ g cm−3. Conforming to the currently known small population of ultrashort period hot Jupiters, the planet appears to orbit a metal-rich star ([Fe/H] = +0.11 ± 0.09 dex). Photoevaporation models suggest the planet should have lost 5 per cent of its gaseous atmosphere over the course of the 9.6 Gyr of evolution of the system. NGTS-6b adds to the small, but growing list of ultrashort period gas giant planets, and will help us to understand the dominant formation and evolutionary mechanisms that govern this population.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stz2349