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Global Simulations of Protoplanetary Disk Outflows with Coupled Non-ideal Magnetohydrodynamics and Consistent Thermochemistry

Author(s): Wang, Lile; Bai, Xue-Ning; Goodman, Jeremy J.

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Abstract: Magnetized winds may be important in dispersing protoplanetary disks and influencing planet formation. We carry out global magnetohydrodynamic simulations in axisymmetry, coupled with ray-tracing radiative transfer, consistent thermochemistry, and non-ideal MHD diffusivities. Magnetized models lacking EUV photons (h nu > 13.6 eV) feature warm molecular outflows that have typical poloidal speeds greater than or similar to 4 km s(-1). When the magnetization is sufficient to drive accretion rates similar to 10(-8) M-circle dot yr(-1), the wind mass-loss rate is comparable. Such outflows are driven not centrifugally but by the pressure of toroidal magnetic fields produced by bending the poloidal field. Both the accretion and outflow rates increase with the poloidal field energy density, the former almost linearly. The mass-loss rate is also strongly affected by ionization due to UV and X-ray radiation near the wind base. Adding EUV irradiation to the system heats, ionizes, and accelerates the part of the outflow nearest the symmetry axis, but reduces the overall mass-loss rate by exerting pressure on the wind base. Most of our models are non-turbulent, but some with reduced dust abundance and therefore higher ionization fractions exhibit magnetorotational instabilities near the base of the wind.
Publication Date: 20-Mar-2019
Electronic Publication Date: 27-Mar-2019
Citation: Wang, Lile, Bai, Xue-Ning, Goodman, Jeremy. (2019). Global Simulations of Protoplanetary Disk Outflows with Coupled Non-ideal Magnetohydrodynamics and Consistent Thermochemistry. ASTROPHYSICAL JOURNAL, 874 (10.3847/1538-4357/ab06fd
DOI: doi:10.3847/1538-4357/ab06fd
ISSN: 0004-637X
EISSN: 1538-4357
Related Item: http://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2019ApJ...874...90W
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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