Ring formation and dust dynamics in wind-driven protoplanetary discs: global simulations
arXiv:2006.01194 · doi:10.1051/0004-6361/201937418
Abstract
Large-scale vertical magnetic fields are believed to play a key role in the evolution of protoplanetary discs. Associated with non-ideal effects, such as ambipolar diffusion, they are known to launch a wind that could drive accretion in the outer part of the disc ( AU). They also potentially lead to self-organisation of the disc into large-scale axisymmetric structures, similar to the rings recently imaged by sub-millimetre or near-infrared instruments (ALMA and SPHERE). The aim of this paper is to investigate the mechanism behind the formation of these gaseous rings, but also to understand the dust dynamics and its emission in discs threaded by a large-scale magnetic field. To this end, we performed global magneto-hydrodynamics (MHD) axisymmetric simulations with ambipolar diffusion using a modified version of the PLUTO code. We explored different magnetisations with the midplane parameter ranging from to and included dust grains -- treated in the fluid approximation -- ranging from m to 1 cm in size. We first show that the gaseous rings (associated with zonal flows) are tightly linked to the existence of MHD winds. Secondly, we find that millimetre-size dust is highly sedimented, with a typical scale height of 1 AU at AU for , compatible with recent ALMA observations. We also show that these grains concentrate into pressure maxima associated with zonal flows, leading to the formation of dusty rings. Using the radiative transfer code MCFOST, we computed the dust emission and make predictions on the ring-gap contrast and the spectral index that one might observe with interferometers like ALMA.
17 pages, accepted in A&A
References in corpus (27)
- PLUTO: a Numerical Code for Computational Astrophysics
- A High Order Godunov Scheme with Constrained Transport and Adaptive Mesh Refinement for Astrophysical MHD
- Monte Carlo radiative transfer in protoplanetary disks
- Gaps, Rings, and Non-Axisymmetric Structures in Protoplanetary Disks - From Simulations to ALMA Observations
- A Three-Dimensional View of Turbulence: Constraints on Turbulent Motions in the HD 163296 Protoplanetary Disk using DCO
- Magnetic fields in protoplanetary disks
- Meridional flows in the disk around a young star
- Hall-effect Controlled Gas Dynamics in Protoplanetary Disks: II. Full 3D Simulations toward the Outer Disk
- Dust settling in local simulations of turbulent protoplanetary disks
- Global Simulations of the Inner Regions of Protoplanetary Disks with Comprehensive Disk Microphysics
- Resolved images of a protostellar outflow launched by an extended disk wind
- Mapping accretion and its variability in the young open cluster NGC 2264: a study based on u-band photometry
- Disk-Driven Rotating Bipolar Outflow in Orion Source I
- Vertical shear instability in accretion disc models with radiation transport
- Magnetic Flux Concentration and Zonal Flows in Magnetorotational Instability Turbulence
- On the Stability of Elliptical Vortices in Accretion Discs
- Radiation Hydrodynamical Turbulence In Protoplanetary Disks: Numerical Models and Observational Constraints
- ALMA discovery of a rotating SO/SO flow in HH212. A possible MHD disk wind?
- Particle dynamics in discs with turbulence generated by the vertical shear instability
- Rotating molecular outflows: the young T Tauri star in CB26
- Turbulent diffusion in protoplanetary discs: the effect of an imposed magnetic field
- Dust-driven viscous ring-instability in protoplanetary disks
- Dust Transport in MRI Turbulent Disks: Ideal and Non-ideal MHD with Ambipolar Diffusion
- Spontaneous ring formation in wind-emitting accretion discs
- Measuring protoplanetary disk gas surface density profiles with ALMA
- Pebble Accretion in Turbulent Protoplanetary Disks
- Nonaxisymmetric Rossby Vortex Instability with Toroidal Magnetic Fields in Radially Structured Disks