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Formation and Evolution of Disks Around Young Stellar Objects.
Bo Zhao1, Kengo Tomida2, Patrick Hennebelle3
11Max-Planck-Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany.
Space Science Reviews
|April 14, 2020
Summary
Circumstellar disks commonly form around young stars, but theory struggles with magnetic braking. This review explores mechanisms like magnetic field misalignment and turbulence to reconcile observations with theory for disk formation.
Area of Science:
- Astrophysics
- Stellar Formation
- Magnetohydrodynamics
Background:
- Recent observations indicate circumstellar disks frequently form around young stellar objects.
- Theoretical models face challenges explaining disk formation due to efficient magnetic braking in realistic magnetized cores.
- Magnetic braking removes significant angular momentum, hindering disk development in simulations.
Purpose of the Study:
- To review recent advancements in the formation and early evolution of circumstellar disks around young stellar objects (YSOs).
- To highlight mechanisms bridging the gap between observational evidence and theoretical predictions of disk formation.
- To discuss implications for protoplanetary disk properties and related phenomena like outflow launching and multiple system formation.
Main Methods:
- Review of recent theoretical studies and observational data on young stellar object disk formation.
- Analysis of non-ideal magnetohydrodynamics (MHD) effects in core collapse.
- Investigation of asymmetric perturbations, including magnetic field misalignment and turbulence, in collapsing cores.
Main Results:
- Efficient magnetic braking in idealized models impedes disk formation.
- Non-ideal MHD effects and core asymmetries offer potential solutions to the angular momentum problem.
- These mechanisms may facilitate disk formation and influence outflow launching and multiple system formation.
Conclusions:
- Bridging the gap between observation and theory requires considering complex physics beyond simple ideal MHD.
- Non-ideal MHD and core perturbations are crucial for understanding the ubiquity of observed circumstellar disks.
- Further research into these mechanisms will refine our understanding of protoplanetary disk properties and early stellar system evolution.
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