Keplerian and Infall Motions Around the Late-Phase Protostar TMC-1A

摘要

We have observed the protostar TMC-1A (Class I, Tbol= 118 K) using ALMA Cycle 0 in 1.3-mm dust continuum, ~(12)CO (J= 2 - 1), and C~(18)O (J= 2 - 1) emission. Our results suggest that TMC-1A has a Keplerian disk (R_(kep)= 100 AU, M_*= 0.68 M_Θ) and an envelope showing an infalling velocity 0.3 times as large as the free fall velocity.