Description
Cosmic dust models are key ingredients in modelling and advancing in our understanding of astrophysical environments as diverse as interstellar clouds, circumstellar enveloppes of evolved and young stars or protoplanetary disks. They consists of several dust populations having different compositions and size distributions. All include a population of silicate grains and most of them also include carbonaceous grains as well as a PAH component. The emission, absorption and scattering properties of these grain populations are calculated from their optical constants and fundamental properties which have various experimental, phenomenological or theoretical origins depending on the models. In this talk I will present new experimental data on the absorption opacity of silicate dust analogues and their related optical constants. I will also present preliminary results on PAHs obtained within the context of the LAIBrary project (Library of simulated AIB spectra) aiming at providing fundamental data needed to model their emission .
