Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...703.1863k&link_type=abstract
The Astrophysical Journal, Volume 703, Issue 2, pp. 1863-1871 (2009).
Astronomy and Astrophysics
Astronomy
2
Accretion, Accretion Disks, Magnetic Fields, Stars: Formation, Stars: Magnetic Fields
Scientific paper
Young stars are strongly magnetized. They interact with circumstellar disks through a shared magnetosphere. The interaction can have powerful effects on both the mass accretion from the disk to the star and the launch of magnetocentrifugal outflows. In this work, we show an extensive set of topological types of axisymmetric magnetospheres of the star-disk system, obtained numerically under the current-free assumption. We find that the topologies fall under a few broad categories, with different degrees of magnetic linkage between the star and the disk. A particularly interesting topology features a saddle point in the stellar corona, which enables to implement, this time in a simplified current-free form, the simultaneous existence of three regions of considerable astrophysical significance, as first proposed for X-winds. These regions are a "funnel" region of inward-pointing field lines along which matter can flow from the inner part of the disk to the star, a region of outward-pointing open field lines that can drive a magnetocentrifugal wind, and an axial region of open stellar fields that allow stellar wind to escape. The Coronal Saddle point topology and other current-free configurations can serve as a starting point for full MHD simulations of the complex, dynamic, magnetic interaction between the young star and its circumstellar disk.
Krasnopolsky Ruben
Li Zhi-Yun
Shang Hsien
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