Invited Presentation

Chemical Diagnostics for Tracing the Physical Structures in Disk-Forming Regions of Young Low-Mass Protostellar Sources

Author(s): Yoko Oya (YITP/Kyoto University)

Presenter: Yoko Oya (Kyoto University)

To understand the origin of the Solar system, the physical/chemical evolution along the star/planet formation is key issues. Extensive observational studies with ALMA have recently revealed that both the physical structure and the chemical composition drastically change during the disk formation around protostars. Furthermore, it has been found that molecular distributions are sensitive to changes in the physical conditions. Some kinds of molecular lines are therefore prospected to work as 'molecular markers' to highlight particular structures of disk forming regions. Sulfur-bearing species (e.g. OCS and H2CS) especially seem good tracers. Machine/deep learnings may help us to disentangle the observed structures.
Specifically, angular momentum of the gas is the essential topic to understand the structure formation. The chemical diagnostics described above can be a helpful tool to tackle with the redistribution of the angular momentum among the disk/envelope and outflow structures. Conversely, detailed physical characterization is essential to elucidating the chemical evolution occurring there. I am going to present our current understandings for the link between the physics and chemistry in young low-mass protostellar sources.