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

Lile Wang, Xue Ning Bai, Jeremy Goodman

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

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 (hn > 13.6 eV) feature warm molecular outflows that have typical poloidal speeds 4 km s -1 . When the magnetization is sufficient to drive accretion rates ∼ 10-8 Myr -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.

Original languageEnglish (US)
Article number90
JournalAstrophysical Journal
Volume874
Issue number1
DOIs
StatePublished - Mar 20 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • accretion, accretion disks
  • circumstellar matter
  • magnetohydrodynamics (MHD)
  • methods: numerical
  • planets and satellites: formation

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