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We constrain the parameters of dynamical dark energy in the form of aclassical scalar field with barotropic equation of state jointly with othercosmological parameters using various combined datasets including the CMB powerspectra from WMAP7, the baryon acoustic oscillations in the space distributionof galaxies from SDSS DR7 and WiggleZ, the light curves of SN Ia from 3different compilations: SDSS (SALT2 and MLCS2k2 light curve fittings), SNLS3and Union2.1. The considered class of models involves both quintessential andphantom subclasses. The analysis has shown that the phantom models aregenerally preferred by the observational data. We discuss the effect ofallowing for non-zero masses of active neutrinos, non-zero curvature ornon-zero contribution from the tensor mode of perturbations on the precision ofdark energy parameters estimation. We also perform a forecast for the Planckmock data.

Scalar fields with barotropic equation of state: quintessence versus phantom