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We report the discovery of MASCARA-1 b, the first exoplanet discovered withthe Multi-site All-Sky CAmeRA (MASCARA). It is a hot Jupiter orbiting a bright$m_V=8.3$, rapidly rotating ($v\sin i_\star > 100~\rm{km~s}^{-1}$) A8 star witha period of $2.148780\pm8\times10^{-6} ~\rm{days}$. The planet has a mass andradius of $3.7\pm0.9~\rm{M}_{\rm{Jup}}$ and $1.5\pm0.3~\rm{R}_{\rm{Jup}}$,respectively. As with most hot Jupiters transiting early-type stars we find amisalignment between the planet orbital axis and the stellar spin axis, whichmay be signature of the formation and migration histories of this family ofplanets. MASCARA-1 b has a mean density of $1.5\pm0.9~\rm{g~cm^{-3}}$ and anequilibrium temperature of $2570^{+50}_{-30}~\rm{K}$, one of the highesttemperatures known for a hot Jupiter to date. The system is reminiscent ofWASP-33, but the host star lacks apparent delta-scuti variations, making theplanet an ideal target for atmospheric characterization. We expect this to bethe first of a series of hot Jupiters transiting bright early-type stars thatwill be discovered by MASCARA.

MASCARA-1 b: A hot Jupiter transiting a bright $m_V=8.3$ A-star in a misaligned orbit