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Sub-arcsecond images of the rotational line emission of CS and SO have beenobtained toward the Class I protostar IRAS 04365$+$2535 in TMC-1A with ALMA. Acompact component around the protostar is clearly detected in the CS and SOemission. The velocity structure of the compact component of CS revealsinfalling-rotating motion conserving the angular momentum. It is well explainedby a ballistic model of an infalling-rotating envelope with the radius of thecentrifugal barrier (a half of the centrifugal radius) of 50 AU, although thedistribution of the infalling gas is asymmetric around the protostar. Thedistribution of SO is mostly concentrated around the radius of the centrifugalbarrier of the simple model. Thus a drastic change in chemical composition ofthe gas infalling onto the protostar is found to occur at a 50 AU scaleprobably due to accretion shocks, demonstrating that the infalling material issignificantly processed before being delivered into the disk.

Subarcsecond Analysis of Infalling-Rotating Envelope around the Class I Protostar IRAS 04365+2535