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 ^ { +0.024 } _ { -0.028 } M _ { J } and 1.271 ^ { +0.197 } _ { -0.188 } R _ { J } respectively , returning a planetary bulk density of 0.711 ^ { +0.214 } _ { -0.136 } 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 .