A Few Tens au Scale Physical and Chemical Structures Around Young Low-Mass Protostars

This  book characterizes the kinematic and chemical structures of  disk-forming regions around low-mass protostellar sources and their  interplay based on Atacama Large Millimeter/submillimeter Array (ALMA)  observations. It describes the chemical evolution of molecules formed in  an interstellar gas using the ALMA observations of 5 Sun-like  protostars at a spatial resolution of a few tens au scale, which unveils  the physical mechanism of star and planetary formation.

The  book reviews the author’s successful works, focusing on two key  findings: (i) A drastic change in the chemical composition of the gas  around the centrifugal barrier of the infalling-rotating envelopes, and  (ii) the chemical composition in the disk-forming regions, which varies  from source to source depending on the chemical characteristics of the  parent molecular cloud. These findings are based on the fine  characterization of physical structures based on careful kinematic  analyses. An additional attraction is the inclusion of the skillful  reviews of ALMA observatory and its observation and physical models to  describe the observed gas structure.