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Fig. 7


CO ice depletion timescale (dark blue line) and thermal desorption timescales for binding energies of 855 K (orange line) and 1200 K (red line) as a function of the dust temperature for the density profiles of IRAS4B. The light blue line shows the free-fall time for an enclosed mass of 0.5 M. The points of intersection at ~17 K and ~24 K indicate the locations of the CO snow line for the two different values of the binding energy. The gray area shows the range of depletion timescales if the dust density is varied by a factor of ten. For a binding energy of 855 K, the variation of the density translates into a variation of the snow line location at ~16 K or ~17 K, while for a binding energy of 1200 K, the modified snow line locations would be at ~23 K or ~25 K.

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