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Exoplanetary properties depend on stellar properties: to know the planet withaccuracy and precision it is necessary to know the star as accurately andprecisely as possible. Our immediate aim is to characterize in a homogeneousand accurate way a sample of 27 transiting planet-hosting stars observed withinthe GAPS program. We determined stellar parameters (effective temperature,surface gravity, rotational velocity) and abundances of 26 elements(Li,C,N,O,Na,Mg,Al,Si,S,Ca,Sc,Ti,V,Cr,Fe,Mn,Co,Ni,Cu,Zn,Y,Zr,Ba,La,Nd,Eu). Ourstudy is based on high-resolution HARPS-N@TNG and FEROS@ESO spectra and uniformtechniques. We derived kinematic properties from Gaia data and estimated forthe first time in exoplanet host stars ages using elemental ratios as chemicalclocks. Teff of our stars is of 4400-6700 K, while [Fe/H] is within -0.3 and0.4 dex. Lithium is present in 7 stars. [X/H] and [X/Fe] abundances vs [Fe/H]are consistent with the Galactic Chemical Evolution. The dependence of [X/Fe]with the condensation temperature is critically analyzed with respect tostellar and kinematic properties. All targets with measured C and O abundancesshow C/O<0.8, compatible with Si present in rock-forming minerals. Most oftargets show 1.0<Mg/Si<1.5, compatible with Mg distributed between olivine andpyroxene. HAT-P-26, the target hosting the lowest-mass planet, shows thehighest Mg/Si ratio. From our chemo-dinamical analysis we find agreementbetween ages and position within the Galactic disk. We note a tendency forhigher density planets to be around metal-rich stars and hints of higherstellar abundances of some volatiles for lower mass planets. We cannot excludethat part of our results could be also related to the location of the starswithin the Galactic disk. We trace the planetary migration scenario from thecomposition of the planets related to the chemical composition of the hostingstars

The GAPS Programme with HARPS-N at TNG. XXXV. Fundamental properties of transiting exoplanet host stars