NGTS 15b, 16b, 17b, and 18b: four hot Jupiters from the Next-Generation Transit Survey

We report the discovery of four new hot Jupiters with Next Generation Transit Survey (NGTS). NGTS-15b, NGTS-16b, NGTS-17b, and NGTS-18b are short-period ($P<5$d) planets orbiting G-type main sequence stars, radii masses between $1.10-1.30$ $R_J$ $0.41-0.76$ $M_J$. By considering host star luminosities planets' small orbital separations ($0.039-0.052$ AU), we find that all highly irradiated therefore occupy a region parameter space in which planetary inflation mechanisms become effective. Comparison statistical studies consideration high incident fluxes reveals indeed likely inflated, although some disparities arise upon analysis current Bayesian inflationary models. However, underlying relationships govern radius remain poorly understood. postulate inclusion additional hyperparameters to describe latent factors such as heavy element fraction, well addition an updated catalogue Jupiters, would refine models, thus furthering our understanding physical processes give rise inflated planets.