  Context: Thanks to the importance that the star-planet relation has to our
understanding of the planet formation process, the precise determination of
stellar parameters for the ever increasing number of discovered extrasolar
planets is of great relevance. Furthermore, precise stellar parameters are
needed to fully characterize the planet properties. It is thus important to
continue the efforts to determine, in the most uniform way possible, the
parameters for stars with planets as new discoveries are announced. Aims: In
this paper we present new precise atmospheric parameters for a sample of 50
stars with planets. The results are presented in the catalogue: SWEET-Cat.
Methods: Stellar atmospheric parameters and masses for the 50 stars were
derived assuming local thermodynamic equilibrium (LTE) and using
high-resolution and high signal-to-noise spectra. The methodology used is based
on the measurement of equivalent widths with ARES2 for a list of iron lines.
The line abundances were derived using MOOG. We then used the curve of growth
analysis to determine the parameters. We implemented a new minimization
procedure which significantly improves the computational time. Results: The
stellar parameters for the 50 stars are presented and compared with previously
determined literature values. For SWEET-Cat, we compile values for the
effective temperature, surface gravity, metallicity, and stellar mass for
almost all the planet host stars listed in the Extrasolar Planets Encyclopedia.
This data will be updated on a continuous basis. The data can be used for
statistical studies of the star-planet correlation, and for the derivation of
consistent properties for known planets.
