期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 507, 期 2, 页码 2354-2372出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab2296
关键词
magnetic fields; MHD; methods: numerical; protoplanetary discs; stars: formation; stars: winds; outflows
资金
- European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013) [339248]
- University of St Andrews
- BEIS capital funding via STFC capital grants [ST/K000373/1, ST/R002363/1]
- STFC DiRAC Operations [ST/R001014/1]
Through three-dimensional simulations, this study found that the Hall effect in non-ideal magnetohydrodynamic processes has the greatest impact on star formation. Different non-ideal processes affect the collapse of rotating clouds and the formation of early disk structures, promoting or hindering the occurrence of outflows.
Non-ideal magnetohydrodynamic (MHD) processes - namelyOhmic resistivity, ambipolar diffusion, and theHall effect - modify the early stages of the star formation process and the surrounding environment. Collectively, they have been shown to promote disc formation and promote or hinder outflows. But which non-ideal process has the greatest impact? Using three-dimensional smoothed particle radiation non-ideal MHD simulations, we model the gravitational collapse of a rotating, magnetized cloud through the first hydrostatic core phase to shortly after the formation of the stellar core. We investigate the impact of each process individually and collectively. Including any non-ideal process decreases the maximum magnetic field strength by at least an order of magnitude during the first core phase compared to using ideal MHD, and promotes the formation of a magnetic wall. When the magnetic field and rotation vectors are anti-aligned and the Hall effect is included, rotationally supported discs of r >= 20 AU form; when only the Hall effect is included and the vectors are aligned, a counter-rotating pseudo-disc forms that is not rotationally supported. Rotationally supported discs of r <= 4 AU form if only Ohmic resistivity or ambipolar diffusion are included. The Hall effect suppresses first core outflows when the vectors are anti-aligned and suppresses stellar core outflows independent of alignment. Ohmic resistivity and ambipolar diffusion each promote first core outflows and delay the launching of stellar core outflows. Although each non-ideal process influences star formation, these results suggest that the Hall effect has the greatest influence.
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