Transiting exoplanets from the CoRoT space mission

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 anti-center direction. CoRoT-5b is a “hot Jupiter-type” planet with a radius of $1.388^{+0.046}_{-0.047}$ RJup, a mass of $0.467^{+0.047}_{-0.024}$ MJup, and therefore, a mean density of $0.217^{+0.031}_{-0.025}$ $\rm g\,cm^{-3}$. The planet orbits an F9V star of 14.0 mag in $4.0378962 \pm 0.0000019$ days at an orbital distance of $0.04947^{+0.00026}_{-0.00029}$ AU