Poster Presentation

Vertical structure and emission of magnetized acretion disk aroud young stars

Author(s): Carlos Tapia IRyA, UNAM Susana Lizano IRyA, UNAM

Presenter: Carlos Tapia (IRyA, UNAM)

We calculate the emission of protoplanetary disks threaded by a poloidal magnetic field and irradiated by the central star whose vertical structure was studied by Lizano and collaborators. We consider disks around low mass protostars, T Tauri stars, and FU Ori stars with diferent mass-to-flux ratios. We calculate the spectral energy distribution and the antenna temperature profiles at 1 mm and 7 mm convolved with the ALMA and VLA beams. We compare the emission of models with diferent levels of magnetization and find that weakly magnetized disks emit more than strongly magnetized disks. This happens because the former are denser, hotter and have larger aspect ratios, receiving more irradiation from the central star. The level of magnetization also afects the optical depth at millimeter wavelengths, being larger for weakly magnetized disks. For moderate magnetization, disks around low mass protostars and T Tauri stars are optically thin at 7 mm. A qualitative comparison of the emission of magnetized disks (including heating by an external envelope) with the observed millimeter temperature profiles of HL Tau indicates that large cm grains are required to reproduce the observed 7 mm emission at large radii.