* Astronomy

Title: Transiting exoplanets from the CoRoT space mission: VII. The "hot-Jupiter"-type planet CoRoT-5b
Authors: H. Rauer, D. Queloz, Sz. Csizmadia, M. Deleuil, R. Alonso, S. Aigrain, J. M. Almenara, M. Auvergne, A. Baglin, P. Barge, P. Borde, F. Bouchy, H. Bruntt, J. Cabrera, L. Carone, S. Carpano, R. De la Reza, H. J. Deeg, R. Dvorak, A. Erikson, M. Fridlund, D. Gandolfi, M. Gillon, T. Guillot, E. Guenther, A. Hatzes, G. Hebrard, P. Kabath, L. Jorda, H. Lammer, A. Leger, A. Llebaria, P. Magain, T. Mazeh, C. Moutou, M. Ollivier, M. Paetzold, F. Pont, M. Rabus, S. Renner, D. Rouan, A. Shporer, B. Samuel, J. Schneider, A. H. M. J. Triaud, G. Wuchterl

Aims. The CoRoT space mission continues to photometrically monitor about 12 000 stars in its field-of-view for a series of target fields to search for transiting extrasolar planets ever since 2007. Deep transit signals can be detected quickly in the "alarm-mode" in parallel to the ongoing target field monitoring. CoRoT's first planets have been detected in this mode. Methods. The CoRoT raw lightcurves are filtered for orbital residuals, outliers, and low-frequency stellar signals. The phase folded lightcurve is used to fit the transit signal and derive the main planetary parameters. Radial velocity follow-up observations were initiated to secure the detection and to derive the planet mass. Results. We report the detection of CoRoT-5b, detected during observations of the LRa01 field, the first long-duration field in the galactic anticenter direction. CoRoT-5b is a "hot Jupiter-type" planet with a radius of 1.388(+0.046, -0.047) R_Jup, a mass of 0.467(+0.047, -0.024) M_Jup, and therefore, a mean density of 0.217(+0.031, -0.025) g cm-3. The planet orbits an F9V star of 14.0 mag in 4.0378962 ±0.0000019 days at an orbital distance of 0.04947(+0.00026,  -0.00029) AU.

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