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Context. Carbon, oxygen and nitrogen (CNO) are key elements in stellarformation and evolution, and their abundances should also have a significantimpact on planetary formation and evolution.  Aims. We present a detailed spectroscopic analysis of 1110 solar-type stars,143 of which are known to have planetary companions. We have determined thecarbon abundances of these stars and investigate a possible connection betweenC and the presence of planetary companions. Methods. We used the HARPSspectrograph to obtain high-resolution optical spectra of our targets. Spectralsynthesis of the CH band at 4300\AA was performed with the spectral synthesiscodes MOOG and FITTING.  Results. We have studied carbon in several reliable spectral windows and haveobtained abundances and distributions that show that planet host stars arecarbon rich when compared to single stars, a signature caused by the knownmetal-rich nature of stars with planets. We find no different behaviour whenseparating the stars by the mass of the planetary companion.  Conclusions. We conclude that reliable carbon abundances can be derived forsolar-type stars from the CH band at 4300\AA. We confirm two different slopetrends for [C/Fe] with [Fe/H] because the behaviour is opposite for stars aboveand below solar values. We observe a flat distribution of the [C/Fe] ratio forall planetary masses, a finding that apparently excludes any clear connectionbetween the [C/Fe] abundance ratio and planetary mass.

CNO behaviour in planet-harbouring stars. II. Carbon abundances in stars with and without planets using the CH band