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We present new ground-based, multi-colour, broad-band photometricmeasurements of the physical parameters, transmission and emission spectra ofthe transiting extrasolar planet WASP-19b. The measurements are based onobservations of 8 transits and four occultations using the 1.5m DanishTelescope, 14 transits at the PEST observatory, and 1 transit observedsimultaneously through four optical and three near-infrared filters, using theGROND instrument on the ESO 2.2m telescope. We use these new data to measurerefined physical parameters for the system. We find the planet to be morebloated and the system to be twice as old as initially thought. We also usedpublished and archived datasets to study the transit timings, which do notdepart from a linear ephemeris. We detected an anomaly in the GROND transitlight curve which is compatible with a spot on the photosphere of the parentstar. The starspot position, size, spot contrast and temperature wereestablished. Using our new and published measurements, we assembled theplanet's transmission spectrum over the 370-2350 nm wavelength range and itsemission spectrum over the 750-8000 nm range. By comparing these data totheoretical models we investigated the theoretically-predicted variation of theapparent radius of WASP-19b as a function of wavelength and studied thecomposition and thermal structure of its atmosphere. We conclude that: there isno evidence for strong optical absorbers at low pressure, supporting the commonidea that the planet's atmosphere lacks a dayside inversion; the temperature ofthe planet is not homogenized, because the high warming of its dayside causesthe planet to be more efficient in re-radiating than redistributing energy tothe night side; the planet seems to be outside of any current classificationscheme.

Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry