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Simple YSO model – sYSOm


Model of the continuum emission from a young stellar object (YSO) composed by a central star, modeled as a blackbody, and a dusty circumstellar disk. The disk is assumed to be geometrically flat with radial-dependent temperature and surface density prescribed by power laws. The local intensity of the disk, seen at a given inclination, is then given by a blackbody emission at the local temperature weighted by an factor that depends on the local surface density and a chosen dust-opacity model. In addition to images at different wavelengths, sYSOm can also provide the total spectral flux (spectral energy distributions). sYSOm is well suited to model simple YSO objects in the near- and mid-infrared. The specific intensity maps in the fits files have units of "J / (m2 s sr m)". A grid of models can be generated if required (check info in "Grid parameters").

Sample output file (.fits)

The sYSOm model was created by A. Domiciano de Souza and A. Matter, based on the work of E. Kokoulina, A. Matter, and collaborators.

It is described in the following articles:

  • First MATISSE L-band observations of HD 179218. Is the inner 10 au region rich in carbon dust particles?
    E. Kokoulina, A. Matter, B. Lopez, et al.
    A&A 652, 61 (2021)
    DOI | ads
  • Evidence of a discontinuous disk structure around the Herbig Ae star HD 139614
    A. Matter; L. Labadie, A. Kreplin, et al.
    A&A 561, 26 (2014)
    DOI | ads

Submit your request

To submit your parameters, you can either:
  • Manually fill the fields below
  • Pre-fill the fields with default values:
  • Upload a parameters file [sample file]:

Circumstellar dust-disc parameters

Grid parameters

(Grid parameter under test)


Geometrical and numerical parameters


Central star parameters

Spectral coverage