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Thanks to ground-based infrared and sub-mm observations the study of thedusty torus of nearby AGN has greatly advanced in the last years. With the aimof further investigating the nuclear mid-infrared emission of the archetypalSeyfert 2 galaxy NGC1068, here we present a fitting to the N- and Q-bandMichelle/Gemini spectra. We initially test several available SED libraries,including a smooth, clumpy and two phase torus models, and a clumpy disk pluswind model. Although, the smooth torus model describe the spectra of NGC1068 ifwe allow to vary some model parameters among the two spectral bands. Motivatedby this result, we produced new SEDs using the radiative transfer code SKIRT.We use two concentric tori that allow us to test a more complex geometry. Wetest different values for the inner and outer radii, half opening angle, radialand polar exponent of the power-law density profile, opacity, and viewingangle. Furthermore, we also test the dust grains size and different optical andcalorimetric properties of silicate grains. The best fitting model consists oftwo concentric components with outer radii of 1.8 and 28 pc, respectively. Wefind that the size and the optical and calorimetric properties of graphite andsilicate grains in the dust structure are key to reproduce the spectra ofNGC1068. We conclude that the dust in NGC1068 reaches different scales, wherethe highest contribution to the mid-infrared is given by a central and compactcomponent. A less dense and extended component is present, which can be eitherpart of the same torus (conforming a flared disk) or can represent the emissionof a polar dust component, as already suggested from interferometricobservations.

The complex infrared dust continuum emission of NGC1068: ground-based N- and Q-band spectroscopy and new radiative transfer models