Dynamics Near the Inner Dead-Zone Edges in a Proprotoplanetary Disk

Abstract

We perform three-dimensional global non-ideal magnetohydrodynamic simulations of a protoplanetary disk containing the inner dead-zone edge. We take into account realistic diffusion coefficients of the Ohmic resistivity and ambipolar diffusion based on detailed chemical reactions with single-size dust grains. We found that the conventional dead zone identified by the Elsässer numbers of the Ohmic resistivity and ambipolar diffusion is divided into two regions: "the transition zone" and "the coherent zone". The coherent zone has the same properties as the conventional dead zone, and extends outside of the transition zone in the radial direction. Between the active and coherent zones, we discover the transition zone, the inner edge of which is identical to that of the conventional dead zone. The transition zone extends out over the regions where thermal ionization determines diffusion coefficients. The transition zone has completely different physical properties than the conventional dead zone, the so-called undead zone, and the zombie zone. The combination of amplification of the radial magnetic field owing to the ambipolar diffusion and a steep radial gradient of the Ohmic diffusivity causes the efficient evacuation of the net vertical magnetic flux from the transition zone within several rotations. Surface gas accretion occurs in the coherent zone but not in the transition zone. The presence of the transition zone prohibits mass and magnetic flux transport from the coherent zone to the active zone. Mass accumulation occurs at both edges of the transition zone as a result of mass supply from the active and coherent zones.

43 pages, 37 figures, PASJ open access (https://doi.org/10.1093/pasj/psae036)

References in corpus (26)

• Athena: A New Code for Astrophysical MHD
• The Athena++ Adaptive Mesh Refinement Framework: Design and Magnetohydrodynamic Solvers
• An Unsplit Godunov Method for Ideal MHD via Constrained Transport in Three Dimensions
• Global simulations of protoplanetary disks with ohmic resistivity and ambipolar diffusion
• MHD simulations of jet acceleration from Keplerian accretion disks: the effects of disk resistivity
• Heat and Dust in Active Layers of Protostellar Disks
• Global Simulations of the Inner Regions of Protoplanetary Disks with Comprehensive Disk Microphysics
• Dead Zone Accretion Flows in Protostellar Disks
• Parameters of Herbig Ae/Be and Vega-type stars
• Magnetic Flux Concentration and Zonal Flows in Magnetorotational Instability Turbulence
• Can dead zones create structures like a transition disk?
• On the Linear Stability of Weakly-Ionized, Magnetized Planar Shear Flows
• 3D Radiation Non-ideal Magnetohydrodynamical Simulations Of The Inner Rim In Protoplanetary Disks
• Assembling the Building Blocks of Giant Planets around Intermediate Mass Stars
• Hall-effect Mediated Magnetic Flux Transport in Protoplanetary Disks
• On the vertical-shear instability in astrophysical discs
• Temperature Structure in the Inner Regions of Protoplanetary Disks: Inefficient Accretion Heating Controlled by Nonideal Magnetohydrodynamics
• Global Hydromagnetic Simulations of Protoplanetary Disks with Stellar Irradiation and Simplified Thermochemistry
• Global Three-Dimensional Simulations of Outer Protoplanetary Disks with Ambipolar Diffusion
• Spontaneous ring formation in wind-emitting accretion discs
• Magnetic outflows from turbulent accretion disks: I. Vertical structure & secular evolution
• Giant protostellar flares: accretion-driven accumulation and reconnection-driven ejection of magnetic flux in protostars
• MRI-active inner regions of protoplanetary discs. I. A detailed model of disc structure
• The vertical shear instability in poorly ionised, magnetized protoplanetary discs
• On the Vertical Shear Instability in Magnetized Protoplanetary Disks
• Transition region from turbulent to dead zone in protoplanetary disks: local shearing box simulations

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• Global magnetohydrodynamic simulations of the inner regions of protoplanetary discs. II. Vertical-net-flux regime
• Heavy element enrichment of gas in surface-accretion disks: A possible origin of the mass-metallicity anti-correlation in exoplanets