Protostars and Planets VI, Heidelberg, July 15-20, 2013
Simulation of protoplanetary disk images with embedded low-mass companions
Demidova, Tatiana (Pulkovo Observatory of Russian Academy of Sciences,196140, Saint-Petersburg, Pulkovskoye chaussee 65/1, Russia)
Grinin, Vladimir (Pulkovo Observatory of Russian Academy of Sciences,196140, Saint-Petersburg, Pulkovskoye chaussee 65/1, Russia)
We consider the model of an young star with a protoplanetary disk and a low-mass companion (q = M1:M2 <= 0.1), which is moving on a circular orbit, slightly inclined to the disk plane (<= 30 deg). Periodic perturbations in the circumstellar disk caused by the orbital motion of the companion produce streams of matter and density waves. The inner part of the disk is warped because of the inclination of the companion orbit to the disk plane. For studies of these phenomena we calculated the set of the hydrodynamic models of such a system for the wide range of the parameters with SPH method. It was shown the non-axial symmetric distribution of matter led to the strong dependence of illumination conditions of the disk on the azimuth and, therefore, to the appearance of large-scale asymmetry in disks images. Near the inner boundary of the disk the images represent the streams of matter, which move with the companion. Outer part of the disk has the bright and dark domains, located not symmetrical with respect to the line of nodes. The sizes and locations of the domains depend on the model parameters as well as on the phase of the orbital period. The bright and dark domains do not follow the companion, but make small amplitude oscillations with respect to the some direction. The properties of the described model open new opportunities of searching low-mass companions in the vicinity of young stars. The stars with protoplanetary disks, which are observed face-on or under the small inclination angle i, are the best ones for this purpose.
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