2006ApJ...651..321H

We present high-resolution 0".45x0".32 observations from the BIMA array toward the Herbig Ae system MWC 480 in the λ=1.4 mm dust continuum. We resolve a circumstellar disk of radius ∼170 AU and constrain the disk parameters by comparing the observations to flat-disk models. These results show that the typical fit parameters of the disk, such as the mass, M_D∼0.04-0.18 M_☉, and the surface density power-law index, p=0.5 or 1, are comparable to those of the lower mass T Tauri stars. The dust in the MWC 480 disk can be modeled as processed dust material (β~0.8), similar to the Herbig Ae star CQ Tau disk; the fitted disk parameters are also consistent with less evolved dust (β~1.2). The possibility of grain growth in the MWC 480 circumstellar disk is supported by the acceptable fits with β~0.8. The surface density power-law profiles of p=0.5 and p=1 can be easily fitted to the MWC 480 disk; however, a surface density power-law profile similar to the minimum mass solar nebula model p=1.5 is ruled out at an 80% confidence level.