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We present the discovery of NGTS-1b, a hot-Jupiter transiting an earlyM-dwarf host ($T_{eff}=3916^{+71}_{-63}~K$) in a P=2.674d orbit discovered aspart of the Next Generation Transit Survey (NGTS). The planet has a mass of$0.812^{+0.066}_{-0.075}~M_{J}$, making it the most massive planet everdiscovered transiting an M-dwarf. The radius of the planet is$1.33^{+0.61}_{-0.33}~R_{J}$. Since the transit is grazing, we determine thisradius by modelling the data and placing a prior on the density from thepopulation of known gas giant planets. NGTS-1b is the third transiting giantplanet found around an M-dwarf, reinforcing the notion that close-in gas giantscan form and migrate similar to the known population of hot Jupiters aroundsolar type stars. The host star shows no signs of activity, and the kinematicshint at the star being from the thick disk population. With a deep (2.5%)transit around a $K=11.9$ host, NGTS-1b will be a strong candidate to probegiant planet composition around M-dwarfs via JWST transmission spectroscopy.

NGTS-1b: A hot Jupiter transiting an M-dwarf