Chaotic star formation and the alignment of stellar rotation with disc and planetary orbital axes
Chaotic star formation and the alignment of stellar rotation with disc and planetary orbital axes
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混沌恒星的形成以及恒星旋转与盘和行星轨道轴的对齐
DOI:
10.1111/j.1365-2966.2009.15773.x
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发表时间:
2010
影响因子:
4.8
通讯作者:
Bate M
中科院分区:
文献类型:
--
作者:
Bate M
We investigate the evolution of the relative angle between the stellar rotation axis and the circumstellar disc axis of a star that forms in a stellar cluster from the collapse of a turbulent molecular cloud. This is an inherently chaotic environment with variable accretion, both in terms of rate and the angular momentum of the material, and dynamical interactions between stars. We find that the final stellar rotation axis and disc spin axis can be strongly misaligned, but this occurs primarily when the disc is truncated by a dynamical encounter so that the final disc rotation axis depends simply on what fell in last. This may lead to planetary systems with orbits that are misaligned with the stellar rotation axis, but only if the final disc contains enough mass to form planets. We also investigate the time variability of the inner-disc spin axis, which is likely to determine the direction of a protostellar jet. We find that the jet direction varies more strongly for lighter discs, such as those that have been truncated by dynamical interactions or have suffered a period of rapid accretion. Finally, we note that variability of the angular momentum of the material accreted by a star implies that the internal velocity field of such stars may be more complicated than that of aligned differential rotation.
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DOI:
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发表时间:
1994
期刊:
影响因子:
--
作者:
I. Yi
通讯作者:
I. Yi
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
M. Bate;I. Bonnell;V. Bromm
通讯作者:
V. Bromm
DOI:
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发表时间:
2007
期刊:
影响因子:
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作者:
G. Lodato;J. C. D. O. Physics;Astronomy;U. I. D. O. Astronomy;Cambridge
通讯作者:
Cambridge
DOI:
10.1111/j.1365-2966.2005.09476.x
发表时间:
2005
影响因子:
4.8
作者:
M. Bate
通讯作者:
M. Bate
DOI:
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发表时间:
2003
期刊:
影响因子:
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作者:
Daniel J. Price;J. Pringle;A. King
通讯作者:
A. King