The 2D Continuum Radiative Transfer Problem: Benchmark Results for Disk   Configurations
  We present benchmark problems and solutions for the continuum radiative transfer (RT) in a 2D disk configuration. The reliability of three Monte-Carlo and two grid-based codes is tested by comparing their results for a set of well-defined cases which differ for optical depth and viewing angle. For all the configurations, the overall shape of the resulting temperature and spectral energy distribution is well reproduced. The solutions we provide can be used for the verification of other RT codes.We also point out the advantages and disadvantages of the various numerical techniques applied to solve the RT problem. 
I. Pascucci (1), S. Wolf (1,2), J. Steinacker (1,3), C. P. Dullemond   (4), Th. Henning (1), G. Niccolini (5), P. Woitke (6)...