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By means of radiative transfer simulation we study the evolution of thefar-infrared colours of protoplanetary discs undergoing inside-out dispersal,often referred to as transition discs. We show that a brightening of the midand far-infrared emission from these objects is a natural consequence of theremoval of the inner disc. Our results can fully explain recent observations oftransition discs in the Chamaleon and Lupus star forming regions from theHerschel Gould Belt Survey, which show a higher median for the 70?um (HerschelPACS 1) band of known transition objects compared with primordial discs. Ourtheoretical results hence support the suggestion that the 70?um band may be apowerful diagnostic for the identification of transition discs from photometrydata, provided that the inner hole is larger than tens of AU, depending onspectral type. Furthermore we show that a comparison of photometry in the K ,12?um and 7u0?m bands to model tracks can provide a rough, but quick estimateof the inner hole size of these objects, provided their inclination is below?85 degrees and the inner hole size is again larger than tens of AU.

Far-infrared signatures and inner hole sizes of protoplanetary discs undergoing inside-out dust dispersal