Saturday, July 25, 2015

Bimodality of Circumstellar Disk Evolution Induced by Hall Current

Bimodality of circumstellar disk evolution induced by Hall current


Tsukamoto et al


The formation process of circumstellar disks is still controversial because of the interplay of complex physical processes that occurs during the gravitational collapse of prestellar cores. In this study, we investigate the effect of the Hall current term on the formation of circumstellar disk using three-dimensional simulations. In our simulations, all non-ideal effects as well as the radiation transfer are considered. We show that the size of the disk is significantly affected by a simple difference in the inherent properties of the prestellar core, namely whether the rotation vector and the magnetic field are parallel or anti-parallel. In the former case, only a very small disk ( less than 1 AU) is formed. On the other hand, in the latter case, a massive and large (greater than 20 AU) disk is formed in the early phase of protostar formation. We also show that the anti-rotating envelopes against the disk-rotation appear with a size of ≳200 AU. We predict that the anti-rotating envelope will be found in the future observations.

No comments:

Post a Comment

Note: Only a member of this blog may post a comment.