Ultra-hot Jupiters sample from exoplanets.eu. This sample corresponds to all confirmed planets with equilibrium temperatures larger than 2000 K, which have been detected via radial-velocity or transits methods. In the horizontal axis we show the equilibrium temperatureof the planet, and in the vertical axis the stellar effective temperature. The semi-major axes of the systems are colour-coded in the side bar (in AU). Some names of UHJs’ host stars mentioned in this paper are shown as reference.