摘要：This Erratum is to clarify a potential confusion regarding Equation (2) in the Appendix B in Dong et al. (2018). The factor of 0.5 in 0.5 Rmm is an approximate correction factor meant to identify the radius where the dust temperature is the global average in a disk whose size is Rmm. This is to account for the fact that dust at different radii has different temperature. If the surface density follows a Σ ∼ 1/R radial profile and the disk extends from R = 0 to R = Rmm, 0.5 Rmm is the half-mass radius, i.e., the radius inside which half of the disk mass is enclosed. Equation (2) in the Appendix B is a fit to simulations to give the specific temperature at R = 0.5Rmm, not Rmm, in a disk; this temperature is considered as a proxy for the average dust temperature in a disk whose outer edge is at Rmm.
