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We report the first detection of sodium absorption in the atmosphere of thehot Jupiter WASP-52b. We observed one transit of WASP-52b with thelow-resolution Optical System for Imaging and low-Intermediate-ResolutionIntegrated Spectroscopy (OSIRIS) at the 10.4 m Gran Telescopio Canarias (GTC).The resulting transmission spectrum, covering the wavelength range from 522 nmto 903 nm, is flat and featureless, except for the significant narrowabsorption signature at the sodium doublet, which can be explained by anatmosphere in solar composition with clouds at 1 mbar. A cloud-free atmosphereis stringently ruled out. By assessing the absorption depths of sodium invarious bin widths, we find that temperature increases towards loweratmospheric pressure levels, with a positive temperature gradient of 0.88 +/-0.65 K/km, possibly indicative of upper atmospheric heating and a temperatureinversion.

The GTC exoplanet transit spectroscopy survey. VII. Detection of sodium in WASP-52b's cloudy atmosphere