Qatar Exoplanet Survey: Qatar-7b—A Very Hot Jupiter Orbiting a Metal-rich F-Star

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}_\star =1.41+/- 0.03 {M}_⊙ and {R}_\star =1.56+/- 0.02 {R}_⊙ , respectively, at a distance d = 726 ± 26 pc, and an estimated age ∼1 Gyr. 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.