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Transitional disks show a lack of excess emission at infrared wavelengths dueto a large dust cavity, that is often corroborated by spatially resolvedobservations 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. The ALMA datareveal a circular-symmetric dusty disk extending to ~350 au, and a moleculardisk traced in CO J=3-2 emission, extending to ~750 au. The CO emission arisesfrom a flared layer with an opening angle ~ 30 deg - 40 deg. HD 97048 isanother source for which the large (~ mm-sized) dust grains are more centrallyconcentrated than the small (~ {\mu}m-sized) grains and molecular gas, likelydue to radial drift. The images and visibility data modelling suggests adecrement in continuum emission within ~50 au, consistent with the cavity sizedetermined from mid-infrared imaging (34 +/- 4 au). The extracted continuumintensity profiles show ring-like structures with peaks at ~50, 150, and 300au, with associated gaps at ~100 and 250 au. This structure should be confirmedin higher-resolution images (FWHM ~ 10 - 20 au). These data confirm theclassification of HD 97048 as a transitional disk that also possesses multiplering-like structures in the dust continuum emission. Additional data arerequired at multiple and well-separated frequencies to fully characterise thedisk structure, and thereby constrain the mechanism(s) responsible forsculpting the HD 97048 disk.

ALMA reveals the anatomy of the mm-sized dust and molecular gas in the HD 97048 disk