NGTS-6b: An Ultra Short Period Hot-Jupiter Orbiting an Old K Dwarf

Abstract

We report the discovery of a new ultra-short 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 $1.330_{-0.028}^{+0.024}$\mjup\, and $1.271_{-0.188}^{+0.197}$\rjup\, respectively, returning a planetary bulk density of 0.711${}_{-0.136}^{+0.214}$~g~cm${}^{-3}$. Conforming to the currently known small population of ultra-short period hot Jupiters, the planet appears to orbit a metal-rich star ([Fe/H]$=+0.11\pm 0.09$~dex). Photoevaporation models suggest the planet should have lost 5\% of its gaseous atmosphere over the course of the 9.6~Gyrs of evolution of the system. NGTS-6b adds to the small, but growing list of ultra-short period gas giant planets, and will help us to understand the dominant formation and evolutionary mechanisms that govern this population.

arXiv comment10 pages, 11 figures. Paper accepted for publication in MNRAS

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