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Carbon, oxygen and nitrogen (CNO) are key elements in stellar formation and evolution, and their abundances should also have a significant impact on planetary formation and evolution.\n  Aims. We present a detailed spectroscopic analysis of 1110 solar-type stars, 143 of which are known to have planetary companions. We have determined the carbon abundances of these stars and investigate a possible connection between C and the presence of planetary companions. Methods. We used the HARPS spectrograph to obtain high-resolution optical spectra of our targets. Spectral synthesis of the CH ba","authors_text":"E. Delgado Mena, G. Israelian, J.I. Gonz\\'alez Hern\\'andez, L. Su\\'arez-Andr\\'es, N. C. Santos, S. G. Sousa, V. Zh. Adibekyan","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-11-30T11:12:25Z","title":"CNO behaviour in planet-harbouring stars. II. 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