Resolving and probing the circumstellar disk of the Herbig Ae star MWC 480 at λ = 1.4 mm: Evolved dust?

Murad Hamidouche, Leslie W. Looney, Lee G. Mundy

Research output: Contribution to journalArticlepeer-review


We present high-resolution 0.″45 x 0.″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, MD ∼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.

Original languageEnglish (US)
Pages (from-to)321-327
Number of pages7
JournalAstrophysical Journal
Issue number1 I
StatePublished - Nov 1 2006


  • Circumstellar matter
  • Stars: evolution
  • Stars: formation
  • Stars: individual (MWC 480)
  • Techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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