Analysis of the dust dynamics in the outflow around protostar 

Hayato Uchimura  (Kagoshima University)

There are complex gas dynamics around protostars such as bipolar molecular outflows and envelope mass accretion. It is very important to consider the impact of these complex gas dynamics on dust dynamics. In particular, recent theoretical studies have found that dust is ejected from protoplanetary disks by bipolar molecular outflows.

In this study, dust dynamics in the outflow is studied analytically to determine the maximum size of dust grains that can be ejected into interstellar space by the outflow using a steady, axisymmetric MHD outflow model. We find that dust up to millimeter to centimeter in size can be accelerated by the outflow and ultimately ejected into interstellar space. Furthermore, the dependence of this maximum dust size on parameters (e.g., mass flux, magnetic field strength) is determined.