Light-curve of COROT-exo-4b's parent star

The light-curve of the parent star of the newly-found exoplanet, COROT-exo-4b. The X-axis shows time in heliocentric julian days (HJD).

COROT-exo-4b is an exoplanet of about the same size as Jupiter. It takes 9.2 days to orbit its star, the longest period for any transiting exoplanet ever found.