Rossby wave instability in weakly ionized protoplanetary disks. II. radial B-fields

Abstract

Building on our first paper in this series, we investigate the impact of radial magnetic fields and non-ideal magnetohydrodynamic (MHD) effects - specifically, Ohmic resistivity, Hall drift, and ambipolar diffusion - on RWI unstable modes. The presence of a radial field is linked to the disk's vertical shear and vertical magnetic field. We perform radially global linear analyses and utilize the spectral code \textsc{Dedalus} to solve the matrix eigenvalue problems. Our findings reveal that radial fields exhibit behavior similar to vertical fields. In the ideal MHD limit, radial fields enhance the effect of vertical fields in reducing growth rates, with significant reductions starting at relatively weak field strengths, around $\beta \sim 10^3-10^4$, which are relevant to protoplanetary disks. In the non-ideal MHD limit, all three non-ideal effects, when sufficiently strong, cause the growth rates to closely resemble those observed in hydrodynamic models.

8 pages, 4 figures, accepted to MNRAS DOI:10.1093/mnras/staf733

References in corpus (21)

• Gas- and dust evolution in protoplanetary disks
• Magnetic Fields in the Formation of Sun-Like Stars
• The stickiness of micrometer-sized water-ice particles
• Global simulations of protoplanetary disks with ohmic resistivity and ambipolar diffusion
• Magnetic fields in protoplanetary disks
• Global Simulations of the Inner Regions of Protoplanetary Disks with Comprehensive Disk Microphysics
• Dust Trapping by Vortices in Transitional Disks: Evidence for Non-ideal MHD Effects in Protoplanetary Disks
• Dust growth and evolution in protoplanetary disks
• On the vertical-shear instability in astrophysical discs
• Global Hydromagnetic Simulations of Protoplanetary Disks with Stellar Irradiation and Simplified Thermochemistry
• Global Three-Dimensional Simulations of Outer Protoplanetary Disks with Ambipolar Diffusion
• Slowly-growing gap-opening planets trigger weaker vortices
• Long-Lived Dust Asymmetries at Dead Zone Edges in Protoplanetary Disks
• Super-Reflection in Fluid Discs: Corotation Amplifier, Corotation Resonance, Rossby Waves, and Overstable Modes
• Turbulence in outer protoplanetary disks: MRI or VSI?
• The vertical shear instability in poorly ionised, magnetized protoplanetary discs
• The saturation of the VSI in protoplanetary disks via parametric instability
• On the Vertical Shear Instability in Magnetized Protoplanetary Disks
• On the Origin of Dust Structures in Protoplanetary Disks: Constraints from the Rossby Wave Instability
• Emergence of vortices at the edges of planet-driven gaps in protoplanetary discs
• Comets and Planetesimal Formation

Cited by in corpus (1)

• Dust Growth in ALMA Rings: II. Dusty Rossby Wave Instability