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In this paper we present MASCARA-2 b, a hot Jupiter transiting the $m_V=7.6$A2 star HD 185603. Since early 2015, MASCARA has taken more than 1.6 millionflux measurements of the star, corresponding to a total of almost 3000 hours ofobservations, revealing a periodic dimming in the flux with a depth of $1.3\%$.Photometric follow-up observations were performed with the NITES and IAC80telescopes and spectroscopic measurements were obtained with the HertzsprungSONG telescope. We find MASCARA-2 b orbits HD 185603 with a period of$3.474119^{+0.5}_{-0.6}~\rm{days}$ at a distance of $0.057 \pm0.006~\rm{AU}$, has a radius of $1.83 \pm 0.07~\rm{R}_{\rm{J}}$ and place a$99\%$ upper limit on the mass of $< 17~\rm{M}_{\rm{J}}$. HD 185603 is arapidly rotating early-type star with an effective temperature of$8980^{+90}_{-130}~\rm{K}$ and a mass and radius of$1.89^{+0.06}_{-0.05}~M_\odot$, $1.60 \pm 0.06~R_\odot$, respectively. Contraryto most other hot Jupiters transiting early-type stars, the projected planetorbital axis and stellar spin axis are found to be aligned with $\lambda=0.6\pm 4^\circ$. The brightness of the host star and the high equilibriumtemperature, $2260 \pm 50~\rm{K}$, of MASCARA-2 b make it a suitable target foratmospheric studies from the ground and space. Of particular interest is thedetection of TiO, which has recently been detected in the similarly hot planetsWASP-33 b and WASP-19 b.

MASCARA-2 b: A hot Jupiter transiting the $m_V=7.6$ A-star HD185603