Influence of sublimation and fragmentation on the pebble radius (top) and Stokes number (bottom) within the snowline of a 1.00 M_⊙ star. The solid lines represent the sublimation model, in which pebbles fragment and immediately recoagulate with a solid-dominated internal density. The dotted lines represent the fragmentation model without recoagulation. The dashed lines show the default model, in which the pebbles’ size and composition remain unaltered as they cross the snowline. The colours of the lines signify different times of evaluation. The circles, triangles, and squares represent crossings of the Epstein-Stokes boundary, the viscous-irradiative boundary and the snowline respectively. At the snowline, R_peb instantaneously decreases due to sublimation, and even more so due to fragmentation, which leads to a local reduction in τ_s.