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In this paper we present the first-ever $L$- and $M$-band interferometricobservations of Circinus, building upon a recent $N$-band analysis. We usedthese observations to reconstruct images and fit Gaussian models to the $L$ and$M$ bands. Our findings reveal a thin edge-on disk whose width is marginallyresolved and is the spectral continuation of the disk imaged in the $N$ band toshorter wavelengths. Additionally, we find a point-like source in the $L$ and$M$ bands that, based on the $LMN$-band spectral energy distribution fit,corresponds to the $N$-band point source. We also demonstrate that there is notrace of direct sightlines to hot dust surfaces in the circumnuclear duststructure of Circinus. By assuming the dust is present, we find thatobscuration of A$_{\rm V} \gtrsim 250$ mag is necessary to reproduce themeasured fluxes. Hence, the imaged disk could play the role of the obscuring"torus" in the unified scheme of active galactic nuclei. Furthermore, weexplored the parameter space of the disk + hyperbolic cone radiative transfermodels and identify a simple modification at the base of the cone. Adding acluster of clumps just above the disk and inside the base of the hyperboliccone provides a much better match to the observed temperature distribution inthe central aperture. This aligns well with the radiation-driven fountainmodels that have recently emerged. Only the unique combination of sensitivityand spatial resolution of the VLTI allows such models to be scrutinized andconstrained in detail. We plan to test the applicability of this detailed duststructure to other MATISSE-observed active galactic nuclei in the future.

The dusty heart of Circinus II. Scrutinizing the LM-band dust morphology using MATISSE