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Observations of transiting extrasolar planets are of key importance to ourunderstanding of planets because their mass, radius, and mass density can bedetermined. The CoRoT space mission allows us to achieve a very highphotometric accuracy. By combining CoRoT data with high-precision radialvelocity measurements, we derive precise planetary radii and masses. We reportthe discovery of CoRoT-19b, a gas-giant planet transiting an old, inactiveF9V-type star with a period of four days. After excluding alternative physicalconfigurations mimicking a planetary transit signal, we determine the radiusand mass of the planet by combining CoRoT photometry with high-resolutionspectroscopy obtained with the echelle spectrographs SOPHIE, HARPS, FIES, andSANDIFORD. To improve the precision of its ephemeris and the epoch, we observedadditional transits with the TRAPPIST and Euler telescopes. Using HARPS spectraobtained during the transit, we then determine the projected angle between thespin of the star and the orbit of the planet. We find that the host star ofCoRoT-19b is an inactive F9V-type star close to the end of its main-sequencelife. The host star has a mass M*=1.21+/-0.05 Msun and radius R*=1.65+/-0.04Rsun. The planet has a mass of Mp=1.11+/-0.06 Mjup and radius of Rp=1.29+/-0.03Rjup. The resulting bulk density is only rho=0.71+/-0.06 gcm-3, which is muchlower than that for Jupiter. The exoplanet CoRoT-19b is an example of a giantplanet of almost the same mass as Jupiter but a 30% larger radius.

Transiting exoplanets from the CoRoT space mission XXI. CoRoT-19b: A low density planet orbiting an old inactive F9V-star