Protoplanetary Disks Revealed by Millimeter Interferometers
* Abstract
Circumstellar disks of young stellar objects (YSOs) at a later stage are often called protoplanetary disks, as they are the natal place of protoplanets. In this talk, we present continuum observations at λ = 1.3 and 2.7 mm using the Combined Array for Research in Millimeter-wave Astronomy toward six protoplanetary disks in the Taurus molecular cloud: CI Tau, DL Tau, DO Tau, FT Tau, Haro 6-13, and HL Tau. We constrain physical properties of the disks with Bayesian inference using two disk models: the flared power-law disk model and flared accretion disk model. Comparing the physical properties, we find that the more extended disks are less flared and that the dust opacity spectral index (β) is smaller in the less massive disks. In addition, disks with a steeper mid-plane density gradient have a smaller β, which suggests that grains grow and radially move. We also discuss the possibilities of substructures on three extended protoplanetary disks. Furthermore, the HL Tau disk images taken by the Atacama Large Millimeter/submillimeter Array (ALMA) are shown and discussed. If time is allowed, disk formation at earlier stages of YSOs would be addressed as well.
