2017A&A...606A..73T

We report the discovery of MASCARA-1 b, which is the first exoplanet discovered with the Multi-site All-Sky CAmeRA (MASCARA). This exoplanet is a hot Jupiter orbiting a bright m_V=8.3, rapidly rotating (vsini_*>100km/s) A8 star with a period of 2.148780±8x10^–6-days. The planet has a mass and radius of 3.7±0.9M_Jup and 1.5±0.3R_Jup, respectively. As with most hot Jupiters transiting early-type stars, we find a misalignment between the planet orbital axis and the stellar spin axis, which may be a signature of the formation and migration histories of this family of planets. MASCARA-1 b has a mean density of 1.5±0.9g/cm³ and an equilibrium temperature of 2570⁺⁵⁰_–30K, that is one of the highest temperatures known for a hot Jupiter to date. The system is reminiscent of WASP-33, but the host star lacks apparent delta-scuti variations, making the planet an ideal target for atmospheric characterization. We expect this to be the first of a series of hot Jupiters transiting bright early-type stars that will be discovered by MASCARA.