Restoration of the Parameters of a Gas-Dust Disk Based on Its Synthetic Images

TL;DR

This study combines hydrodynamic and radiative transfer models to generate synthetic images of protoplanetary disks, enabling comparison with observations and assessment of disk parameter reconstruction accuracy.

Contribution

It integrates a dynamic disk evolution model with radiation transfer simulations to analyze thermal structures and improve parameter estimation from synthetic spectra.

Findings

Viscous and adiabatic heating significantly influence disk temperature.

Reconstructed disk parameters often differ from initial model values.

Model verification requires spatially resolved observations across spectral ranges.

Abstract

The topic of the present study is combining a dynamic model of a protoplanetary disk with the computations of radiation transfer for obtaining synthetic spectra and disk images suitable for immediate comparison of the model with observations. Evolution of the disk was computed using the FEOSAD hydrodynamic model, which includes a self-consistent calculation of the dynamics of dust and gas in the 2D thin disk approximation. Radiation transfer was simulated by the open code RADMC-3D. Three phases of disk evolution were considered: a young gravitationally unstable disk, a disk during an accretion luminosity burst, and an evolved disk. For these stages, the influence of various processes upon the disk's thermal structure was analyzed, as well as the differences between the temperatures obtained in the initial dynamic model and in the model with a detailed calculation of the radiation transfer. It is shown that viscous heating in the inner regions and adiabatic heating in the disk spirals can be important sources of heating. On the basis of the calculated spectral energy distributions, using SED-fitter software package used for the observations, physical parameters of the model disks were reconstructed. A significant spread between reconstructed parameters and initial characteristics of the disk indicates verification necessity of the models within the framework of spatially resolved observations of disks in the different spectral ranges