Chenghan Hsieh (NTHU); Shih-Ping Lai (NTHU)
VLA1623 is one of the rare Class 0 candidates that contains a Keplerian disk. Previous ALMA data of VLA1623 have been fitted with a flat 2D constant density disk model developed by Murillo et al. (2013). Recent close inspection of ALMA Cycle 2 data reveals a rich extended structure in the PV diagram that can no longer be fitted appropriately with a Keplerian model. This project aims to analysis the motion of extremely young Class 0 circumbinary disk around VLA1623A. By comparing both the 2D and 3D Keplerian disk models with the ALMA data, we identified regions of the circumbinary disk that deviates from the Keplerian motion.