A Tale of Two Grains: impact of grain size on ring formation via nonideal MHD processes

Abstract

Substructures in PPDs, whose ubiquity was unveiled by recent ALMA observations, are widely discussed regarding their possible origins. We carry out global full magnetohydrodynamic (MHD) simulations in axisymmetry, coupled with self-consistent ray-tracing radiative transfer, thermochemistry, and non-ideal MHD diffusivities. The abundance profiles of grains are also calculated based on the global dust evolution calculation, including sintering effects. We found that dust size plays a crucial role in the ring formation around the snow lines of protoplanetary disks (PPDs) through the accretion process. Disk ionization structures and thus tensorial conductivities depend on the size of grains.When grains are significantly larger than PAHs, the non-ideal MHD conductivities change dramatically across each snow line of major volatiles, leading to a sudden change of the accretion process across the snow lines and the subsequent formation of gaseous rings/gaps there. On the other hand,the variations of conductivities are a lot less with only PAH sized grains in disks and then these disks retain smoother radial density profiles across snow lines.

9 pages, 6 figures, submitted to AAS journals

References in corpus (10)

• Evidence of fast pebble growth near condensation fronts in the HL Tau protoplanetary disk
• Magnetic fields in protoplanetary disks
• Hall-effect Mediated Magnetic Flux Transport in Protoplanetary Disks
• Hydrodynamic Photoevaporation of Protoplanetary Disks with Consistent Thermochemistry
• Spontaneous ring formation in wind-emitting accretion discs
• Nonsticky Ice at the Origin of the Uniformly Polarized Submillimeter Emission from the HL Tau Disk
• Destruction of Refractory Carbon in Protoplanetary Disks
• Rings and gaps produced by variable magnetic disk winds and avalanche accretion streams: I. Axisymmetric resistive MHD simulations
• Lack of PAH emission toward low-mass embedded young stellar objects
• Magnetically Induced Disk Winds and Transport in the HL Tau Disk

Cited by in corpus (4)

• (Sub)millimeter Dust Polarization of Protoplanetary Disks from Scattering by Large Millimeter-Sized Irregular Grains
• A potential site for wide-orbit giant planet formation in the IM Lup disk
• Dust rings as a footprint of planet formation in a protoplanetary disk
• Gap Opening in Protoplanetary Disks: Gas Dynamics from Global Non-ideal MHD Simulations with Consistent Thermochemistry