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The spatial and kinematic properties of a large sample of young T Tauri starsfrom the solar neighborhood 500 pc in radius have been studied. The followingparameters of the position ellipsoid have been determined from the mostprobable members of the Gould Belt: its sizes are $350\times 270 \times 87$~pcand it is oriented at an angle of $14\pm1^\circ$ to the Galactic plane with alongitude of the ascending node of $297\pm1^\circ$. An analysis of the motionsof stars from this sample has shown that the residual velocity ellipsoid withprincipal semiaxes $\sigma_{1,2,3}=(8.87,5.58,3.03)\pm(0.10,0.20,0.04)$~kms$^{-1}$ is oriented at an angle of $22\pm1^\circ$ to the Galactic plane with alongitude of the ascending node of $298\pm2^\circ$. It has been establishedthat much of the expansion effect (kinematic $K$ effect) typical for Gould Beltstars, 5--6 km s$^{-1}$ kpc$^{-1}$, can be explained by the influence of aGalactic spiral density wave with a radial perturbation amplitude $f_R\sim5$ kms$^{-1}$.

Kinematics of T Tauri Stars Close to the Sun from the Gaia DR2 Catalogue