Gas and dust dynamics in starlight-heated protoplanetary disks

Abstract

Theoretical models of the ionization state in protoplanetary disks suggest the existence of large areas with low ionization and weak coupling between the gas and magnetic fields. In this regime hydrodynamical instabilities may become important. In this work we investigate the gas and dust structure and dynamics for a typical T Tauri system under the influence of the vertical shear instability (VSI). We use global 3D radiation hydrodynamics simulations covering all $360^{\circ }$ of azimuth with embedded particles of 0.1 and 1mm size, evolved for 400 orbits. Stellar irradiation heating is included with opacities for 0.1- to 10-$\mu$m-sized dust. Saturated VSI turbulence produces a stress-to-pressure ratio of $\alpha \simeq 10^{-4}$. The value of $\alpha$ is lowest within 30~au of the star, where thermal relaxation is slower relative to the orbital period and approaches the rate below which VSI is cut off. The rise in $\alpha$ from 20 to 30~au causes a dip in the surface density near 35~au, leading to Rossby wave instability and the generation of a stationary, long-lived vortex spanning about 4~au in radius and 40~au in azimuth. Our results confirm previous findings that mm size grains are strongly vertically mixed by the VSI. The scale height aspect ratio for 1mm grains is determined to be 0.037, much higher than the value $H/r=0.007$ obtained from millimeter-wave observations of the HL~Tau system. The measured aspect ratio is better fit by non-ideal MHD models. In our VSI turbulence model, the mm grains drift radially inwards and many are trapped and concentrated inside the vortex. The turbulence induces a velocity dispersion of $\sim 12$~m/s for the mm grains, indicating that grain-grain collisions could lead to fragmentation.

ApJ accepted

References in corpus (24)

• PLUTO: a Numerical Code for Computational Astrophysics
• Gaps, Rings, and Non-Axisymmetric Structures in Protoplanetary Disks - From Simulations to ALMA Observations
• Constraining the X-ray and Cosmic Ray Ionization Chemistry of the TW Hya Protoplanetary Disk: Evidence for a Sub-interstellar Cosmic Ray Rate
• Three radial gaps in the disk of TW Hydrae imaged with SPHERE
• Dust settling in local simulations of turbulent protoplanetary disks
• Planet formation bursts at the borders of the dead zone in 2D numerical simulations of circumstellar disks
• The Radial Distribution of Dust Particles in the HL Tau Disk from ALMA and VLA Observations
• Convective Overstability in radially stratified accretion disks under thermal relaxation
• Vertical shear instability in accretion disc models with radiation transport
• On the Stability of Elliptical Vortices in Accretion Discs
• Radiation Hydrodynamical Turbulence In Protoplanetary Disks: Numerical Models and Observational Constraints
• Convective overstability in accretion disks: 3D linear analysis and nonlinear saturation
• 3D Radiation Non-ideal Magnetohydrodynamical Simulations Of The Inner Rim In Protoplanetary Disks
• Particle dynamics in discs with turbulence generated by the vertical shear instability
• Dust-driven viscous ring-instability in protoplanetary disks
• Dust settling against hydrodynamic turbulence in protoplanetary discs
• The T Tauri star RY Tau as a case study of the inner regions of circumstellar dust disks
• Anisotropic hydrodynamic turbulence in accretion disks
• Submillimeter Structure of the Disk of the Butterfly Star
• Magnetically Induced Disk Winds and Transport in the HL Tau Disk
• How do T Tauri stars accrete
• The properties of the inner disk around HL Tau: Multi-wavelength modeling of the dust emission
• Self-Destructing Spiral Waves: Global Simulations of a Spiral Wave Instability in Accretion Disks
• A Vorticity-Preserving Hydrodynamical Scheme for Modeling Accretion Disk Flows

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• Dust Coagulation Reconciles Protoplanetary Disk Observations with the Vertical Shear Instability. I. Dust Coagulation and the VSI Dead Zone
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• Particle Dynamics in 3D Self-gravitating Disks II: Strong Gas Accretion and Thin Dust Disks
• Vertical shear instability in two-moment radiation-hydrodynamical simulations of irradiated protoplanetary disks I. Angular momentum transport and turbulent heating
• Migrating Low-Mass Planets in Inviscid Dusty Protoplanetary Discs
• Vertical shear instability in two-moment radiation-hydrodynamical simulations of irradiated protoplanetary disks II. Secondary instabilities and stability regions
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• Hydrodynamic turbulence in disks with embedded planets
• A "no-drift" runaway pile-up of pebbles in protoplanetary disks in which midplane turbulence increases with radius
• Formation of the First Planetesimals via the Streaming Instability in Globally Turbulent Protoplanetary Disks?
• Vertical shear instability with dust evolution and consistent cooling times. On the importance of the initial dust distribution
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• Investigating the Future Potential of an Upgraded ALMA to Image Planet Forming Disks at Sub-au Scales
• UV-processing of icy pebbles in the outer parts of VSI-turbulent disks
• The interplay between forming planets and photoevaporating discs II: Wind-driven gas redistribution
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• Timescales diagnostics for saving viscous and MHD-driven dusty discs from external photoevaporation
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