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Author(s): Wang, Lile; Goodman, Jeremy J.

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Abstract: Transitional protostellar disks have inner cavities that are heavily depleted in dust and gas, yet most of them show signs of ongoing accretion, often at rates comparable to full disks. We show that recent constraints on the gas surface density in a few well-studied disk cavities suggest that the accretion speed is at least transsonic. We propose that this is the natural result of accretion driven by magnetized winds. Typical physical conditions of the gas inside these cavities are estimated for plausible X-ray and FUV radiation fields. The gas near the midplane is molecular and predominantly neutral, with a dimensionless ambipolar parameter in the right general range for wind solutions of the type developed by Konigl, Wardle, and others. That is to say, the density of ions and electrons is sufficient for moderately good coupling to the magnetic field, but it is not so good that the magnetic flux needs to be dragged inward by the accreting neutrals.
Publication Date: 20-Jan-2017
Electronic Publication Date: 18-Jan-2017
Citation: Wang, Lile, Goodman, Jeremy J. (2017). WIND-DRIVEN ACCRETION IN TRANSITIONAL PROTOSTELLAR DISKS. ASTROPHYSICAL JOURNAL, 835 (10.3847/1538-4357/835/1/59
DOI: doi:10.3847/1538-4357/835/1/59
ISSN: 0004-637X
EISSN: 1538-4357
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Type of Material: Journal Article
Journal/Proceeding Title: ASTROPHYSICAL JOURNAL
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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