Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Magnetic Field in the Class 0 Protostellar Disk of L1527   We present subarcsecond (~0.35") resolved observations of the 1.3 mm dust
polarization from the edge-on circumstellar disk around the Class 0 protostar
L1527. The inferred magnetic field is consistent with a dominantly toroidal
morphology; there is no significantly detected vertical poloidal component to
which observations of an edge-on disk are most sensitive. This suggests that
angular momentum transport in Class 0 protostars (when large amounts of
material are fed down to the disk from the envelope and accreted onto the
protostar) is driven mainly by magnetorotational instability rather than
magnetocentrifugal winds at 50 AU scales. In addition, with the data to date
there is an early, tentative trend that R>30 AU disks have so far been found in
Class 0 systems with average magnetic fields on the 1000 AU scale strongly
misaligned with the rotation axis. The absence of such a disk in the aligned
case could be due to efficient magnetic braking that disrupts disk formation.
If this is the case, this implies that candidate Class 0 disk systems could be
identified by the average magnetic field direction at ~1000 AU spatial scales.

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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an