  I investigate the self-irradiation of intensively accreting circumstellar
discs (backwarmed discs). It is modelled using the two-layer disc approach by
Lachaume et al. (2003) that includes heating by viscous dissipation and by an
external source of radiation. The disc is made of a surface layer directly
heated by the viscous luminosity of the central parts of the disc, and of an
interior heated by viscosity as well as by reprocessed radiation from the
surface. This model convincingly accounts for the infrared excess of some FU
Orionis objects in the range 1-200 microns and supports the backwarmed disc
hypothesis sometimes invoked to explain the mid- and far-infrared excesses
whose origins are still under debate. Detailed simulation of the vertical
radiative transfert in the presence of backwarming is still needed to
corroborate these results and spectroscopically constrain the properties of
intensively accreting discs.
