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Fig. 1

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Density and temperature structure for the representative Class I model. From left to right: total hydrogen number density n⟨ H ⟩, Tdust during the burst, and Tdust in the quiescent (post-burst) phase. The second and third row show a zoom-in to the inner 300 and 60 au (marked by the grey squares in the density plots). The white solid contour in the temperature plots for T = 27 K roughly indicates the CO ice line. Some artefacts are visible in the temperature structure (e.g. last two panels in the second row). These are due to the sharp transition of the two dust populations used for the disk and envelope, but have no significant impact on the large scale temperature structure.

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