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There has been increasing progress toward detailed characterization ofexoplanetary atmospheres, in both observations and theoretical methods.Improvements in observational facilities and data reduction and analysistechniques are enabling increasingly higher quality spectra, especially fromground-based facilities. The high data quality also necessitates concomitantimprovements in models required to interpret such data. In particular, thedetection of trace species such as metal oxides has been challenging. Extremelyirradiated exoplanets (~3000 K) are expected to show oxides with strongabsorption signals in the optical. However, there are only a few hot Jupiterswhere such signatures have been reported. Here we aim to characterize theatmosphere of the ultra-hot Jupiter WASP-33b using two primary transits taken18 orbits apart. Our atmospheric retrieval, performed on the combined datasets, provides initial constraints on the atmospheric composition of WASP-33b.We report a possible indication of aluminum oxide (AlO) at 3.3-sigmasignificance. The data were obtained with the long slit OSIRIS spectrographmounted at the 10-meter Gran Telescopio Canarias. We cleaned the brightnessvariations from the light curves produced by stellar pulsations, and wedetermined the wavelength-dependent variability of the planetary radius causedby the atmospheric absorption of stellar light. A simultaneous fit to the twotransit light curves allowed us to refine the transit parameters, and thecommon wavelength coverage between the two transits served to contrast ourresults. Future observations with HST as well as other large ground-basedfacilities will be able to further constrain the atmospheric chemicalcomposition of the planet.

An optical transmission spectrum of the ultra-hot Jupiter WASP-33b. First indication of AlO in an exoplanet