Abstract
We report the discovery of KELT-7b, a transiting hot Jupiter with a mass of MJ, radius of RJ, and an orbital period of days. The bright host star (HD 33643; KELT-7) is an F-star with V = 8.54, Teff = 6789 K, [Fe/H] , and . It has a mass of M?, a radius of R?, and is the fifth most massive, fifth hottest, and the ninth brightest star known to host a transiting planet. It is also the brightest star around which Kilodegree Extremely Little Telescope (KELT) has discovered a transiting planet. Thus, KELT-7b is an ideal target for detailed characterization given its relatively low surface gravity, high equilibrium temperature, and bright host star. The rapid rotation of the star ( km s?1) results in a Rossiter?McLaughlin effect with an unusually large amplitude of several hundred m s?1. We find that the orbit normal of the planet is likely to be well-aligned with the stellar spin axis, with a projected spin?orbit alignment of ? = 9.?7 ? 5.?2. This is currently the second most rapidly rotating star to have a reflex signal (and thus mass determination) due to a planetary companion measured.
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