| Abstract: |
Recent ALMA observations have led to rapid progress in understanding the physical and chemical structure in protoplanetary disks. For example, ring-gap structures, which suggest possible planet-formation, and circumplanetary disk candidates, as well as the detailed structure of various molecules in such planet-forming disks, have been discovered so far. On the other hand, complex organic molecules, such as methanol, and rare isotopologues, which are difficult to detect before ALMA, also been discovered and even their spatial distributions have been revealed. Furthermore, the observations of the pressure broadening of molecular emission lines have made it possible to measure the gas surface density at the inner regions of the disk. These observations have also provided information on the elemental composition of the disk gas. In this talk, I will review these recent observational and theoretical studies of ALMA observations of protoplanetary disks and give an overview of the physical and chemical properties of the disk gas and dust obtained from the comparison of observations and theory.
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