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We present a uniform study of the chemical abundances of 12 elements (Si, Ca,Sc, Ti, V, Cr, Mn, Co, Ni, Na, Mg, and Al) derived from the spectra of 451stars observed as part of one of the HARPS GTO planet search programs. Sixtyeight of these are planet-bearing stars. The main goals of our work are: i) theinvestigation of possible differences between the abundances of stars with andwithout planets; ii) the study of the possible differences in the abundances ofstars in the thin and the thick disc. We confirm that there is a systematicallyhigher metallicity in planet host stars, when compared to non planet-hosts,common to all studied species. We also found that there is no difference in thegalactic chemical evolution trends of the stars with and without planets. Starsthat harbour planetary companions simply appear to be in the high metallicitytail of the distribution. We also confirm that Neptunian and super-Earth classplanets may be easier to find at lower metallicities. A statisticallysignificative abundance difference between stars of the thin and the thick discwas found for [Fe/H] $<$ 0. However, the populations from the thick and thethin disc cannot be clearly separated.

Chemical abundances of 451 stars from the HARPS GTO planet search program: Thin disc, thick disc, and planets