naa a22 4500 51078982X CHVBK 20180411083316.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1134/S106377371212002X doi (NATIONALLICENCE)springer-10.1134/S106377371212002X Anisotropic illumination of a circumbinary disk in the presence of a low-mass companion [Elektronische Daten] [T. Demidova, V. Grinin, N. Sotnikova] The model of a young star with a protoplanetary disk and a low-mass companion (q ≤ 0.1) moving in a circular orbit inclined to the disk plane is considered. Hydrodynamic models of such a system have been calculated by the SPH method. The perturbations in the disk caused by the orbital motion of the companion are shown to lead to a strong dependence of the disk illumination conditions on azimuth (because of extinction variations between the star and the disk surface) and, as a result, to the appearance of a large-scale asymmetry in the disk images. Calculations show that the dependence of the disk illumination on azimuth is stronger in the central part of the disk than on the periphery. The bright and dark (shadow) regions are located asymmetrically relative to the line of nodes. The sizes of these regions and their positions on the disk depend on model parameters and orbital phase. During the orbital motion, the bright and dark regions do not follow the companion but execute small-amplitude oscillations relative to some direction. The model properties described above open up new possibilities for detecting low-mass companions in the vicinity of young stars. Stars with protoplanetary disks seen face-on or at low inclinations i are best suited for this purpose. Pleiades Publishing, Ltd., 2013 protoplanetary disks nationallicence hydrodynamics nationallicence low-mass companions nationallicence noncoplanar orbits nationallicence Demidova T. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, 196140, St. Petersburg, Russia aut Grinin V. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, 196140, St. Petersburg, Russia aut Sotnikova N. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, 196140, St. Petersburg, Russia aut Astronomy Letters SP MAIK Nauka/Interperiodica 39/1(2013-01-01), 26-37 1063-7737 39:1<26 2013 39 11443 https://doi.org/10.1134/S106377371212002X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S106377371212002X text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Demidova T. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, 196140, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Grinin V. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, 196140, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Sotnikova N. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, 196140, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Astronomy Letters SP MAIK Nauka/Interperiodica 39/1(2013-01-01), 26-37 1063-7737 39:1<26 2013 39 11443 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer