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(abridged) We aim to constrain the location, composition, and dynamical stateof planetesimal populations and dust around the young, sun-like (G2V) star HD107146}. We consider coronagraphic observations obtained with the AdvancedCamera for Surveys (HST/ACS) onboard the HST in broad V and broad I filters, aresolved 1.3mm map obtained with the Combined Array for Research inMillimeter-Wave Astronomy (CARMA), Spitzer/IRS low resolution spectra, and thespectral energy distribution (SED) of the object at wavelengths ranging from3.5micron to 3.1mm. We complement these data with new coronagraphic highresolution observations of the debris disk using the Near Infrared Camera andMulti-Object Spectrometer (HST/NICMOS) aboard the HST in the F110W filter. TheSED and images of the disk in scattered light as well as in thermal reemissionare combined in our modeling using a parameterized model for the disk densitydistribution and optical properties of the dust. A detailed analytical model ofthe debris disk around HD 107146 is presented that allows us to reproduce thealmost entire set of spatially resolved and unresolved multi-wavelengthobservations. Considering the variety of complementary observational data, weare able to break the degeneracies produced by modeling SED data alone. We findthe disk to be an extended ring with a peak surface density at 131AU.Furthermore, we find evidence for an additional, inner disk probably composedof small grains released at the inner edge of the outer disk and moving inwardsdue to Poynting-Robertson drag. A birth ring scenario (i.e., a more or lessbroad ring of planetesimals creating the dust disk trough collisions) is foundto be the most likely explanation of the ringlike shape of the disk.

Multi-wavelength modeling of the spatially resolved debris disk of HD 107146