Theory of Protostellar Disk Formation
نویسندگان
چکیده
منابع مشابه
Formation of a Dynamically Contracting Protostellar Disk
We present similarity solutions that describe the runaway collapse of a rotating isothermal cloud and its subsequent inside-out collapse. During the runaway collapse, the surface density of the disk is nearly constant in the central part and inversely proportional to the radius in the tail. As the central surface density increases by collapse, the central high surface density part shrinks in ma...
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Star formation occurs via accretion through a disk, which is likely to be turbulent, either because of gravitational or magnetorotational instability. Dynamo amplification of magnetic fields needs to be considered. As the disks are also stratified, the turbulence can be helical, with different signs of the helicity in each hemisphere. This provides a key ingredient for amplification of global s...
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It is established that the formation of rotationally supported disks during the main accretion phase of star formation is suppressed by a moderately strong magnetic field in the ideal MHD limit. Non-ideal MHD effects are expected to weaken the magnetic braking, perhaps allowing the disk to reappear. We concentrate on one such effect, ambipolar diffusion, which enables the field lines to slip re...
متن کاملTheory of Protostellar Accretion
This paper reviews current theoretical work on the various stages of accretion in protostars, and the relationship of these ideal stages to the spectral classes of observed protostellar systems. I discuss scaling relationships that have been obtained for models of pre-stellar cores as they evolve by ambipolar diffusion toward a central singularity, and expectations for the dynamical evolution a...
متن کاملThe Formation of the First Stars I. Mass Infall Rates, Accretion Disk Structure and Protostellar Evolution
We present a theoretical model for primordial star formation. First we describe the structure of the initial gas cores as virialized, quasi-hydrostatic objects in accord with recent high resolution numerical studies. The accretion rate can then be related to characteristic densities and temperatures that are set by the cooling properties of molecular hydrogen. We allow for rotation of the gas c...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2015
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921316007377