Behind the scenes of protostellar disk formation
http://phys.org/news/2016-07-scenes-protostellar-disk-formation.html
For a long time the formation of protostellar disks – a prerequisite to the formation of planetary system around stars – has defied theoretical astrophysicists:
In a dense, collapsing cloud of gas and dust, the magnetic field would be dragged to the centre as well resulting in a braking effect. Hardly any rotationally
supported disk can form this way, unless the tiny grains are removed from the cloud by growing or coagulating into bigger grains. This is the result from a new
study published by researchers at the Max Planck Institute for Extraterrestrial Physics and other intuitions. The more realistic simulations now take into
account non-ideal magneto-hydrodynamics and ionization chemistry to form a rotationally supported protostellar disk.
