ALMA Reveals the Anatomy of the mm-Sized Dust and Molecular Gas in the HD97048 Disk

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      • Catherine Walsh
      • Attila Juhasz
      • Gwendolyn Meeus
      • William R. F. Dent
      • Luke T. Maud
      • Yuri Aikawa
      • Tom J. Millar
      • Hideko Nomura

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      Transitional disks show a lack of excess emission at infrared wavelengths due to a large dust cavity, that is often corroborated by spatially resolved observations at ∼ mm wavelengths. We present the first spatially resolved ∼ mm-wavelength images of the disk around the Herbig Ae/Be star, HD 97048. Scattered light images show that the disk extends to ≈640 au. ALMA data reveal a circular-symmetric dusty disk extending to ≈350 au, and a molecular disk traced in CO J = 3-2 emission, extending to ≈750 au. The CO emission arises from a flared layer with an opening angle ≈30°–40°. HD 97048 is another source for which the large (∼ mm-sized) dust grains are more centrally concentrated than the small (∼μm-sized) grains and molecular gas, likely due to radial drift. The images and visibility data modeling suggest a decrement in continuum emission within ≈50 au, consistent with the cavity size determined from mid-infrared imaging (34 ± 4 au). The extracted continuum intensity profiles show ring-like structures with peaks at ≈50, 150, and 300 au, with associated gaps at ≈100 and 250 au. This structure should be confirmed in higher-resolution images (FWHM ≈ 10–20 au). These data confirm the classification of HD 97048 as a transitional disk that also possesses multiple ring-like structures in the dust continuum emission. Additional data are required at multiple and well-separated frequencies to fully characterize the disk structure, and thereby constrain the mechanism(s) responsible for sculpting the HD 97048 disk

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      DOI

      Original languageEnglish
      Article number200
      Number of pages15
      JournalThe Astrophysical Journal
      Journal publication date09 Nov 2016
      Issue number2
      Volume831
      DOIs
      StatePublished - 09 Nov 2016

      ID: 120439403