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We report detections of atomic species in the atmosphere of MASCARA-2 b,using the first transit observations obtained with the newly commissionedEXPRES spectrograph. EXPRES is a highly stabilised optical echellespectrograph, designed to detect stellar reflex motions with amplitudes down to30 cm/s, and was recently deployed at the Lowell Discovery Telescope. Byanalysing the transmission spectrum of the ultra-hot Jupiter MASCARA-2 b usingthe cross-correlation method, we confirm previous detections of Fe I, Fe II andNa I, which likely originate in the upper regions of the inflated atmosphere.In addition, we report significant detections of Mg I and Cr II. The absorptionstrengths change slightly with time, possibly indicating different temperaturesand chemistry in the day-side and night-side terminators. Using the effectivestellar line-shape variation induced by the transiting planet, we constrain theprojected spin-orbit misalignment of the system to $1.6\pm3.1$ degrees,consistent with an aligned orbit. We demonstrate that EXPRES joins a suite ofinstruments capable of phase-resolved spectroscopy of exoplanet atmospheres.

High-resolution Transmission Spectroscopy of MASCARA-2 b with EXPRES