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The study of exoplanet atmospheres is essential to understand the formation,evolution and composition of exoplanets. The transmission spectroscopytechnique is playing a significant role in this domain. In particular, thecombination of state-of-the-art spectrographs at low- and high-spectralresolution is key to our understanding of atmospheric structure andcomposition. Two transits of the close-in sub Saturn-mass planet,WASP-127b,have been observed with ESPRESSO in the frame of the Guaranteed TimeObservations Consortium. Transit observations allow us to study simultaneouslythe system architecture and the exoplanet atmosphere. We found that this planetis orbiting its slowly rotating host star (veq sin(i)=0.53+/-0.07 km/s) on aretrograde misaligned orbit (lambda=-128.41+/-5.60 deg). We detected the sodiumline core at the 9-sigma confidence level with an excess absorption of0.3+/-0.04%, a blueshift of 2.7+/-0.79 km/s and a FWHM of 15.18+/-1.75 km/s.However, we did not detect the presence of other atomic species but setupper-limits of only few scale heights. Finally, we put a 3-sigma upper limit,to the average depth of the 1600 strongest water lines at equilibriumtemperature in the visible band, of 38 ppm. This constrains the cloud-deckpressure between 0.3 and 0.5 mbar by combining our data with low-resolutiondata in the near-infrared and models computed for this planet. To conclude,WASP-127b, with an age of about 10 Gyr, is an unexpected exoplanet by itsorbital architecture but also by the small extension of its sodium atmosphere(~7 scale heights). ESPRESSO allows us to take a step forward in the detectionof weak signals, thus bringing strong constraints on the presence of clouds inexoplanet atmospheres. The framework proposed in this work can be applied tosearch for molecular species and study cloud-decks in other exoplanets.

WASP-127b: A misaligned planet with a partly cloudy atmosphere and tenuous sodium signature seen by ESPRESSO