Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-09-11
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
39 pages, 13 figures, accepted for publication in PASJ. For high resolution figures see http://www2-tap.scphys.kyoto-u.ac.jp
Scientific paper
Using resistive magnetohydrodynamics simulation, we investigate circumstellar disk formation in a strongly magnetized cloud. As the initial state, an isolated cloud core embedded in a low-density interstellar medium with a uniform magnetic field is adopted. The cloud evolution is calculated until almost all gas inside the initial cloud falls onto either the circumstellar disk or a protostar, and a part of the gas is ejected into the interstellar medium by the protostellar outflow driven by the circumstellar disk. In the early main accretion phase, the disk size is limited to \sim 10 AU because the angular momentum of the circumstellar disk is effectively transferred by both magnetic braking and the protostellar outflow. In the later main accretion phase, however, the circumstellar disk grows rapidly and exceeds 100 AU by the end of the main accretion phase. This rapid growth of the circumstellar disk is caused by the depletion of the infalling envelope, while magnetic braking is effective when the infalling envelope is more massive than the circumstellar disk. The infalling envelope cannot brake the circumstellar disk when the latter is more massive than the former. In addition, the protostellar outflow weakens and disappears in the later main accretion phase, because the outflow is powered by gas accretion onto the circumstellar disk. Although the circumstellar disk formed in a magnetized cloud is considerably smaller than that in an unmagnetized cloud, a circumstellar disk exceeding 100 AU can form even in a strongly magnetized cloud.
Inutsuka Shu-ichiro
Machida Masahiro N.
Matsumoto Tomoaki
No associations
LandOfFree
Effect of Magnetic Braking on the Circumstellar Disk Formation in a Strongly Magnetized Cloud does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effect of Magnetic Braking on the Circumstellar Disk Formation in a Strongly Magnetized Cloud, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of Magnetic Braking on the Circumstellar Disk Formation in a Strongly Magnetized Cloud will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-562474