 |
|
| EPoS Contribution |
|
Turbulent origin of streamers onto protostellar disks
Stefan Heigl LMU/USM, Munich, DE | |
| In contrast to the simple collapse of a uniform density prestellar core, observations and simulations of recent years have shown a more complex picture. Mass flow along accretion streams, so-called streamers, have been detected, bringing in material from distances of up to 10000 au which could have a large impact on the disk structure. In order to explain the origin of streamers, we perform AMR grid simulations of collapsing cores in turbulent filaments with sub-au resolution. We show that the streamers are connected to the dissipation of turbulent motions present at core collapse which in turn are inherited from the turbulent motions of the filament. By varying the turbulent driving of the gas inside the filament, we demonstrate that streamers are more dominant for larger Mach numbers which also has an effect on the multiplicity of protostellar objects. Furthermore, despite all material being accreted via free fall and there also being material which is accreted isotropically, most of the total mass of the disk is accumulated via streamers. This demonstrates that the dynamics on the large scales play an important role in the way disks and protostellar objects grow in mass. | |
 | |
| Caption: Zoom-in on the disk forming inside a collapsing core in a simulation of a turbulent filament. | |
| Collaborators: A. Burkert, LMU/USM, DE E. Hoemann, LMU/USM, DE K. Widmaier, LMU/USM, DE |
Suggested Session:
Cores2Disks |