Poster Presentation

Streamers around class 0/I YSOs: what are they?

Author(s): Yueh-Ning Lee

Presenter: Yueh-Ning Lee (National Taiwan Normal University)

With advances in observations, it has become clear that the formation of the star and protoplanetary disk system is not from a uniform collapse of the prestellar core. Structures develop as mass is being fed to the system from larger scales. Notably, many observation of protoplanetary disks under formation show inward spiraling structures, which are given the name "streamers". One of the current explanation is that an over-dense clump gets smeared apart by differential motions in the stellar tidal field. However, it is in first place difficult to establish such an initial condition. Moreover, the CMU model, which is a particle trajectory model, is widely used for this structure that develops within a hydrodynamic density and velocity field. I will argue that such description is not physical, and we might have a better way to describe the streamers.