Equilibrium temperature versus several planet parameters for the known ultra-hot Jupiter (T_eq > 2000 K) planet population. Planets studied in this work are marked with a star symbol. Top left: planet-to-star distance (semi major axis) is shown in the horizontal axis and the equilibrium temperature of the exoplanets is shown in the vertical axis. We note that only those planets with R_p > 0.6 R_J are shown. Bottom left: context of studied planets, marked with a star symbol, with respect to all the UHJ with known surface gravity (we excluded all planets whose masses have only upper limits). The equilibrium temperature is shown in the vertical axis and surface gravity of the planets in the horizontal axis. Top right: calculated transmission spectroscopy metrics (TSM) versus equilibrium temperature of the exoplanets, where stars represent the planets studied in this work. Bottom left: calculated scale height versus equilibrium temperature of the exoplanets. For all of the figures, the V band magnitude of the host star is color-coded and the marker size is indicative of the planetary radius (data are extracted from exoplanet.eu).