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With an equilibrium temperature above 2500 K, the recently discoveredHAT-P-70 b belongs to a new class of exoplanets known as ultra-hot Jupiters:extremely irradiated gas giants with day-side temperatures that resemble thosefound in stars. These ultra-hot Jupiters are among the most amenable targetsfor follow-up atmospheric characterization through transmission spectroscopy.Here, we present the first analysis of the transmission spectrum of HAT-P-70 busing high-resolution data from the HARPS-N spectrograph of a single transitevent. We use a cross-correlation analysis and transmission spectroscopy tolook for atomic and molecular species in the planetary atmosphere. We detectabsorption by Ca II, Cr I, Cr II, Fe I, Fe II, H I, Mg I, Na I and V I, and wefind tentative evidence of Ca I and Ti II. Overall, these signals appearblue-shifted by a few km s$^{-1}$, suggestive of winds flowing at high velocityfrom the day-side to the night-side. We individually resolve the Ca II H & Klines, the Na I doublet, and the H$\alpha$, H$\beta$ and H$\gamma$ Balmerlines. The cores of the Ca II and H I lines form well above the continuum,indicating the existence of an extended envelope. We refine the obliquity ofthis highly misaligned planet to $107.9^{+2.0}_{-1.7}$ degrees by examining theDoppler shadow that the planet casts on its A-type host star. These resultsplace HAT-P-70 b as one of the exoplanets with the highest number of speciesdetected in its atmosphere.

Mining the Ultra-Hot Skies of HAT-P-70b: Detection of a Profusion of Neutral and Ionized Species