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EX Lup is the prototype of a class of pre-main sequence eruptive starsdefined by their repetitive outbursts lasting several months. In 2008January-September EX Lup underwent its historically largest outburst,brightening by about 4 magnitudes in visual light. In previous studies wediscovered on-going silicate crystal formation in the inner disk during theoutburst, but also noticed that the measured crystallinity fraction starteddecreasing after the source returned to the quiescent phase. Here we presentnew observations of the 10 $\mu$m silicate feature, obtained with the MIDI andVISIR instruments at Paranal Observatory. The observations demonstrate thatwithin five years practically all crystalline forsterite disappeared from thesurface of the inner disk. We reconstruct this process by presenting a seriesof parametric axisymmetric radiative transfer models of an expanding dust cloudthat transports the crystals from the terrestrial zone to outer disk regionswhere comets are supposed to form. Possibly the early Sun also experiencedsimilar flare-ups, and the forming planetesimals might have incorporatedcrystalline silicate material produced by such outbursts. Finally, we discusshow far the location of the dust cloud could be constrained by future JWSTobservations.

Spectral evolution and radial dust transport in the prototype young eruptive system EX Lup