摘要：We present the discovery of Qatar-7b—a very hot and inflated giant gas planet orbiting close to its parent star. The host star is a relatively massive main-sequence F-star with mass and radius = M M 1.41 0.03 and =R R 1.56 0.02 , respectively, at a distance d=726±26 pc, and an estimated age ∼1Gyr. With its orbital period of P=2.032 days, the planet is located less than five stellar radii from its host star and is heated to a high temperature T eq ≈2100 K. From a global solution to the available photometric and radial velocity observations, we calculate the mass and radius of the planet to be M P =1.88±0.25 M J and R P =1.70±0.03 R J , respectively. The planet radius and equilibrium temperature put Qatar-7b in the top 6%of the hottest and largest known exoplanets. With its large radius and high temperature, Qatar-7b is a valuable addition to the short list of targets that offer the best opportunity for studying their atmospheres through transmission spectroscopy.
关键词：planetary systems;planets and satellites: detection;planets and satellites: fundamental parameters;techniques: photometric
