Supplementary Text Figs. S1 to S11 Full Reference List Supplementary Text

Protoplanetary disks are dynamic objects through which mass is accreted onto the central star during the final stages of that star’s formation. This evolution is controlled by processes which generate an effective viscosity, ν, and stresses within the differentially rotating gas of the disk. In the thin-disk approximation, the surface density, Σ, of the gas then evolves as described by (32): ∂Σ ∂