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We present a panchromatic study, involving a multiple technique approach, ofthe circumstellar disc surrounding the T Tauri star IM Lupi (Sz 82). We haveundertaken a comprehensive observational study of IM Lupi using photometry,spectroscopy, millimetre interferometry and multi-wavelength imaging. For thefirst time, the disc is resolved from optical and near-infrared wavelengths inscattered light, to the millimetre regime in thermal emission. Our data-set, inconjunction with existing photometric data, provides an extensive coverage ofthe spectral energy distribution, including a detailed spectrum of the silicateemission bands. We have performed a simultaneous modelling of the variousobservations, using the radiative transfer code MCFOST, and analysed a grid ofmodels over a large fraction of the parameter space via Bayesian inference. Wehave constructed a model that can reproduce all of the observations of thedisc. Our analysis illustrates the importance of combining a wide range ofobservations in order to fully constrain the disc model, with each observationproviding a strong constraint only on some aspects of the disc structure anddust content. Quantitative evidence of dust evolution in the disc is obtained:grain growth up to millimetre-sized particles, vertical stratification of dustgrains with micrometric grains close to the disc surface and larger grainswhich have settled towards the disc midplane, and possibly the formation offluffy aggregates and/or ice mantles around grains.

Probing dust grain evolution in IM Lupi's circumstellar disc. Multi-wavelength observations and modelling of the dust disc