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Context. The pioneer space mission for photometric planet searches, CoRoT,steadily monitors about 12,000 stars in each of its fields of view; it is ableto detect transit candidates early in the processing of the data and before theend of a run. Aims. We report the detection of the first planet discovered byCoRoT and characterizing it with the help of follow-up observations. Methods.Raw data were filtered from outliers and residuals at the orbital period of thesatellite. The orbital parameters and the radius of the planet were estimatedby best fitting the phase folded light curve with 34 successive transits.Doppler measurements with the SOPHIE spectrograph permitted us to secure thedetection and to estimate the planet mass. Results. The accuracy of the data isvery high with a dispersion in the 2.17 min binned phase-folded light curvethat does not exceed 3.10-4 in flux unit. The planet orbits a mildly metal-poorG0V star of magnitude V=13.6 in 1.5 days. The estimated mass and radius of thestar are 0.95+-0.15Msun and 1.11+-0.05Rsun. We find the planet has a radius of1.49+-0.08Rjup, a mass of 1.03+-0.12Mjup, and a particularly low mean densityof 0.38 +-0.05g cm-3.

Transiting exoplanets from the CoRoT space mission I - CoRoT-Exo-1b: a low-density short-period planet around a G0V star