Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alignment of Protostars and Circumstellar Disks During the Embedded
  Phase   Star formation proceeds via the collapse of a molecular cloud core over
multiple dynamical timescales. Turbulence within cores results in a spatially
non-uniform angular momentum of the cloud, causing a stochastic variation in
orientation of the disk forming from the collapsing material. In the absence of
star-disk angular momentum coupling, such disk-tilting would provide a natural
mechanism for production of primordial spin-orbit misalignments in the
resulting planetary systems. However, owing to high accretion rates in the
embedded phase of star formation, the inner edge of the circumstellar disk
extends down to the stellar surface, resulting in efficient gravitational and
accretional angular momentum transfer between the star and the disk. Here, we
demonstrate that the resulting gravitational coupling is sufficient to suppress
any significant star-disk misalignment, with accretion playing a secondary
role. The joint tilting of the star-disk system leads to a stochastic wandering
of star-aligned bipolar outflows. Such wandering widens the effective opening
angle of stellar outflows, allowing for more efficient clearing of the
remainder of the protostar's gaseous envelope. Accordingly, the processes
described in this work provide an additional mechanism responsible for
sculpting the stellar Initial Mass Function (IMF).

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The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th