Academia Sinica Logo

To build comprehensive models of planet formation, it is essential to observe younger exoplanets, which are still embedded in their native gas-rich disks, and actively accrete material through their circumplanetary disks (CPDs). Being embedded, they are difficult to observe and characterize because of lack of good tracers. Among the disks with features suggestive of embedded protoplanets, AB Aurigae system appears promising due to the existence of inner spirals, the asymmetric dust ring and the accreting features seen in HCO+, the tentative shock emission in SO in the dust cavity, and the infalling outer spirals from the envelope to the disk. In this talk, I will present the results of recent search for CPDs in AB Aur using the ALMA and SPHERE/VLT data and discuss alternative tracers of the CPDs.