DustEM is a numerical tool that computes the extinction and the emission of interstellar dust grains heated by photons. It is written in fortran 95 and is jointly developed by IAS and IRAP.

Young Stars Emerge from Orion's Head

The dust emission is calculated in the optically thin limit (no radiative transfer) and the default spectral range is 40 to 1E8 nm. The code has been designed so that dust properties can easily be changed and mixed and to allow for the inclusion of new grain physics. Data for DustEM is generated by the IDL code DustProp which features methods to compute dust optical properties (e.g., Mie, T-matrix, DDA) and heat capacities (internal use only). A description and illustration of DustEM can be found in Compi├Ęgne et al (2011).

The DustEM Wrapper IDL tool uses DustEM to compute fluxes in a wide range of instrumental bands and to fit dust parameters. DustEM is coupled to the Meudon PDR code where it handles dust physics. DustEM is also coupled to the radiative transfer code CRT of the University of Helsinki as described in Ysard et al. (2012).


Jean-Philippe Bernard (scientist)
Deborah Paradis (scientist)
Laurent Verstraete (scientist)
Nathalie Ysard (scientist)



  • Laurent.Verstraete at ias.u-psud.fr