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Context. We present the discovery of two transiting extrasolar planets by thesatellite CoRoT. Aims. We aim at a characterization of the planetary bulkparameters, which allow us to further investigate the formation and evolutionof the planetary systems and the main properties of the host stars. Methods. Weused the transit light curve to characterize the planetary parameters relativeto the stellar parameters. The analysis of HARPS spectra established theplanetary nature of the detections, providing their masses. Further photometricand spectroscopic ground-based observations provided stellar parameters (logg,Teff,v sin i) to characterize the host stars. Our model takes the geometry ofthe transit to constrain the stellar density into account, which when linked tostellar evolutionary models, determines the bulk parameters of the star.Because of the asymmetric shape of the light curve of one of the planets, wehad to include the possibility in our model that the stellar surface was notstrictly spherical. Results. We present the planetary parameters of CoRoT-28b,a Jupiter-sized planet (mass 0.484+/-0.087MJup; radius 0.955+/-0.066RJup)orbiting an evolved star with an orbital period of 5.208 51 +/- 0.000 38 days,and CoRoT-29b, another Jupiter-sized planet (mass 0.85 +/- 0.20MJup; radius0.90 +/- 0.16RJup) orbiting an oblate star with an orbital period of 2.850 570+/- 0.000 006 days. The reason behind the asymmetry of the transit shape is notunderstood at this point. Conclusions. These two new planetary systems havevery interesting properties and deserve further study, particularly in the caseof the star CoRoT-29.

astronomy and astrophysics

Transiting exoplanets from the CoRoT space mission XXVII. CoRoT-28b, a  planet orbiting an evolved star, and CoRoT-29b, a planet showing an  asymmetric transit