Debris Disk Radiative Transfer Simulator

Frequently Asked Questions

Before submitting a question, please, check below if it has already been answered.

Your question:


  • What does the runtime of the code mainly depend on?
    • grain size distribution instead of a single grain size: increase by a factor of 32
    • number of selected dust species (chemical components): linear relation
    • furthermore: 
      • number of observing wavelengths
      • complexity of the uploaded density distribution
      • complexity of the uploaded stellar emission SED
    • the total runtime is given in the logfile of each project
  • "Internal error"?
    • Main error source: Uploaded files with wrong format. Input file formats are defined in the Manual .
  • Which Browser the Debris Disk Radiative Transfer Simulator (DDS)  has been tested for?
    • Netscape 6.2.2 / 7.0
    • Windows Internet Explorer 6.0
  • How to find the "log files"?
    • Follow the link at the project number in the title of a page with the results ( example ).
  • What, if the optical depth is too high?
  • The spectral energy distribution is not displayed at the results page?!
    • Klick on the "Reload" button of your browser.
  • What, if the total abundance of all selected dust species is not equal to 100%?
    • That's ok. Internally, the total abundance is normalized to 100%.
    • Example:
      • Two dust species selected: 30% Mg SiO(3) and 20% Fe O. The simulation will be performed for 60% Mg SiO(3) and 40% Fe O.  On the page with the results, however, you will find your input parameters for the dust abundances. This allows you to increase/decrease the abundance of a certain dust component without recalculating the abundances of the other components.

Some hints
  • The dust grain sublimation temperature is a critical parameter since it determines the inner radius of the disk for each chemical component and grain size. Based on the results by Bauer et al. 1997 (A&A 317, 273),  following sublimation temperatures have been chosen for the predefined chemical dust components:
    • Silicates: 1550 K
    • Carbon: 1250 K
You can check the predefined sublimation temperatures of the different dust species. The links to the dust data files are given on the main model definition page, e.g., Mg SiO(3) .

Sebastian Wolf