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Planetary studies demand precise and accurate stellar parameters as input toinfer the planetary properties. Different methods often provide differentresults that could lead to biases in the planetary parameters. In this work, wepresent a refinement of the spectral synthesis technique designed to treatbetter more rapidly rotating FGK stars. This method is used to derive precisestellar parameters, namely effective temperature, surface gravity,metallicitity and rotational velocity. This procedure is tested for samples oflow and moderate/fast rotating FGK stars. The spectroscopic analysis is basedon the spectral synthesis package Spectroscopy Made Easy (SME), assuming Kuruczmodel atmospheres in LTE. The line list where the synthesis is conducted, iscomprised of iron lines and the atomic data are derived after solarcalibration. The comparison of our stellar parameters shows good agreement withliterature values, both for low and for higher rotating stars. In addition, ourresults are on the same scale with the parameters derived from the ironionization and excitation method presented in our previous works. We presentnew atmospheric parameters for 10 transiting planet-hosts as an update to theSWEET-Cat catalogue. We also re-analyse their transit light curves to derivenew updated planetary properties.

Spectroscopic parameters for solar-type stars with moderate/high rotation. New parameters for 10 planet-hosts