The global dust SED: Tracing the nature and evolution of dust with DustEM
M. Compiegne, L. Verstraete, A. Jones, J.-P. Bernard, F. Boulanger, N., Flagey, J. Le Bourlot, D. Paradis, N. Ysard

TL;DR
This paper introduces DustEM, a versatile numerical tool for modeling dust emission and extinction, aiding the study of dust evolution and interpretation of IR and CMB data.
Contribution
DustEM is a new, flexible code that models dust SEDs with various grain types, structures, and physics, facilitating dust evolution studies and data analysis.
Findings
DustEM successfully models the DHGL SED with PAHs, amorphous carbon, and silicates.
IR band ratios can disentangle radiation field effects and grain size distributions.
The code is publicly available for community use.
Abstract
The Planck and Herschel missions are currently measuring the farIR-mm emission of dust, which combined with existing IR data, will for the first time provide the full SED of the galactic ISM dust emission with an unprecedented sensitivity and angular resolution. It will allow a systematic study of the dust evolution processes that affect the SED. Here we present a versatile numerical tool, DustEM, that predicts the emission and extinction of dust given their size distribution and their optical and thermal properties. In order to model dust evolution, DustEM has been designed to deal with a variety of grain types, structures and size distributions and to be able to easily include new dust physics. We use DustEM to model the dust SED and extinction in the diffuse interstellar medium at high-galactic latitude (DHGL), a natural reference SED. We present a coherent set of observations for…
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