The Interplay between Ambipolar Diffusion and Hall Effect on Magnetic Field Decoupling and Protostellar Disc Formation

Abstract

Non-ideal MHD effects have been shown recently as a robust mechanism of averting the magnetic braking "catastrophe" and promoting protostellar disc formation. However, the magnetic diffusivities that determine the efficiency of non-ideal MHD effects are highly sensitive to microphysics. We carry out non-ideal MHD simulations to explore the role of microphysics on disc formation and the interplay between ambipolar diffusion (AD) and Hall effect during the protostellar collapse. We find that removing the smallest grain population ($\lesssim$10 nm) from the standard MRN size distribution is sufficient for enabling disc formation. Further varying the grain sizes can result in either a Hall-dominated or an AD-dominated collapse; both form discs of tens of AU in size regardless of the magnetic field polarity. The direction of disc rotation is bimodal in the Hall dominated collapse but unimodal in the AD-dominated collapse. We also find that AD and Hall effect can operate either with or against each other in both radial and azimuthal directions, yet the combined effect of AD and Hall is to move the magnetic field radially outward relative to the infalling envelope matter. In addition, microphysics and magnetic field polarity can leave profound imprints both on observables (e.g., outflow morphology, disc to stellar mass ratio) and on the magnetic field characteristics of protoplanetary discs. Including Hall effect relaxes the requirements on microphysics for disc formation, so that prestellar cores with cosmic-ray ionization rate of $\lesssim$2--3$\times 10^{-16}$ s${}^{-1}$ can still form small discs of $\lesssim$10 AU radius. We conclude that disc formation should be relatively common for typical prestellar core conditions, and that microphysics in the protostellar envelope is essential to not only disc formation, but also protoplanetary disc evolution.

arXiv comment21 pages, 16 figures, submitted to MNRAS

References in corpus (86)

• Cold Dark Clouds: The Initial Conditions for Star Formation
• Dense Cores in Dark Clouds. XIV. N2H+(1-0) maps of dense cloud cores
• Molecular ions in L1544. II. The ionization degree
• Cosmic-ray ionization of molecular clouds
• Magnetic processes in a collapsing dense core. I Accretion and Ejection
• Protostellar disk formation and transport of angular momentum during magnetized core collapse
• Global simulations of protoplanetary disks with ohmic resistivity and ambipolar diffusion
• The VLA Nascent Disk and Multiplicity Survey of Perseus Protostars (VANDAM). II. Multiplicity of Protostars in the Perseus Molecular Cloud
• Collapse of Magnetized Singular Isothermal Toroids: II. Rotation and Magnetic Braking
• Magnetic Braking and Protostellar Disk Formation: The Ideal MHD Limit
• Global simulations of protoplanetary disks with net magnetic flux: I. Non-ideal MHD case
• The conductivity of dense molecular gas
• Radiation Magnetohydrodynamic Simulations of Protostellar Collapse: Protostellar Core Formation
• Why do protoplanetary disks appear not massive enough to form the known exoplanet population?
• Magnetic Fields in Dark Cloud Cores: Arecibo OH Zeeman Observations
• Mechanism of Magnetic Flux Loss in Molecular Clouds
• Ambipolar diffusion in low-mass star formation. I. General comparison with the ideal MHD case
• Collapse of Rotating Magnetized Molecular Cloud Cores and Mass Outflows
• Radiation Magnetohydrodynamic Simulations of Protostellar Collapse: Non-Ideal Magnetohydrodynamic Effects and Early Formation of Circumstellar Disks
• Nonideal MHD Effects and Magnetic Braking Catastrophe in Protostellar Disk Formation
• Cosmic-ray ionisation in circumstellar discs
• A protostellar system fed by a streamer of 10,500 au length
• Can non-ideal magnetohydrodynamics solve the magnetic braking catastrophe?
• Magnetic Fields and Rotations of Protostars
• Magnetic Braking and Protostellar Disk Formation: Ambipolar Diffusion
• Effects of Ohmic and ambipolar diffusion on the formation and evolution of the first cores, protostars and circumstellar discs
• Conditions for Circumstellar Disk Formation: Effects of Initial Conditions and Sink Treatment
• Does Magnetic Field-Rotation Misalignment Solve the Magnetic Braking Catastrophe in Protostellar Disk Formation?
• The formation of rings and gaps in magnetically coupled disk-wind systems: ambipolar diffusion and reconnection
• Bridging the gap: disk formation in the Class 0 phase with ambipolar diffusion and Ohmic dissipation
• Bimodality of circumstellar disk evolution induced by Hall current
• The Different Structures of the Two Classes of Starless Cores
• Turbulence-induced disc formation in strongly magnetised cloud cores
• Magnetically self-regulated formation of early protoplanetary discs
• Zoom-Simulations of Protoplanetary Disks starting from GMC scales
• The role of turbulent magnetic reconnection on the formation of rotationally supported protostellar disks
• Decoupling of Magnetic Fields in Collapsing Protostellar Envelopes and Disk Formation and Fragmentation
• On the Linear Stability of Weakly-Ionized, Magnetized Planar Shear Flows
• Dust growth in the interstellar medium: How do accretion and coagulation interplay?
• Disk Formation in Magnetized Clouds Enabled by the Hall Effect
• Magnetic fields during the early stages of massive star formation - II. A generalised outflow criterion
• Self-similar Collapse of Rotating Magnetic Molecular Cloud Cores
• Hall-effect Mediated Magnetic Flux Transport in Protoplanetary Disks
• Forming spectroscopic massive proto-binaries by disk fragmentation
• Gravitational collapse of magnetized clouds II. The role of Ohmic dissipation
• A chemical solver to compute molecule and grain abundances and non-ideal MHD resistivities in prestellar core collapse calculations
• The Fundamentally Different Dynamics of Dust and Gas in Molecular Clouds
• The role of magnetic fields in the formation of protostellar discs
• Disk Formation Enabled by Enhanced Resistivity
• The VLA Nascent Disk and Multiplicity Survey of Perseus Protostars (VANDAM). V. 18 Candidate Disks around Class 0 and I Protostars in the Perseus Molecular Cloud
• What determines the formation and characteristics of protoplanetary discs?
• The impact of the Hall effect during cloud core collapse:implications for circumstellar disk evolution
• Is the dust-to-gas ratio constant in molecular clouds?
• Protostellar Accretion Flows Destabilized by Magnetic Flux Redistribution
• The Hall effect in star formation
• Effect of Grain Size on Differential Desorption of Volatile Species and on Non-ideal MHD Diffusivity
• Protoplanetary Disk Masses from Radiative Transfer Modeling: A Case Study in Taurus
• The chemistry of protoplanetary fragments formed via gravitational instabilities
• A Three-dimensional Simulation of a Magnetized Accretion Disk: Fast Funnel Accretion onto a Weakly Magnetized Star
• The role of cosmic rays on magnetic field diffusion and the formation of protostellar discs
• On the Role of Pseudodisk Warping and Reconnection in Protostellar Disk Formation in Turbulent Magnetized Cores
• Protostellar collapse: the conditions to form dust rich protoplanetary disks
• Dust coagulation feedback on magnetohydrodynamic resistivities in protostellar collapse
• On the Eccentricity Excitation in Post-Main Sequence Binaries
• Disk Formation in Magnetized Dense Cores with Turbulence and Ambipolar Diffusion
• Disc formation and fragmentation using radiative non-ideal magnetohydrodynamics
• The impact of non-ideal magnetohydrodynamics on binary star formation
• Magnetic Flux Expulsion in Star Formation
• Impact of the Hall effect in star formation and the issue of angular momentum conservation
• The Hall effect in accretion flows
• Hall Effect in Protostellar Disc Formation and Evolution
• On the Grain-Modified Magnetic Diffusivities in Protoplanetary Disks
• Rapid Elimination of Small Dust Grains in Molecular Clouds
• Ionization: a possible explanation for the difference of mean disk sizes in star-forming regions
• Early evolution of disk, outflow, and magnetic field of young stellar objects: Impact of dust model
• On the fragmentation boundary in magnetised self-gravitating discs
• The magnetic diffusivities in 3D radiative chemo-hydrodynamic simulations of protostellar collapse
• Dependence of Hall Coefficient on Grain Size and Cosmic Ray Rate and Implication for Circumstellar Disk Formation
• Angular Momenta, Magnetization, and Accretion of Protostellar Cores
• Different Modes of Star Formation II: Gas Accretion Phase of Initially Subcritical Star-Forming Clouds
• Using cm Observations to Constrain the Abundance of Very Small Dust Grains in Galactic Cold Cores
• Possible Counter Rotation between the Disk and Protostellar Envelope around the Class I Protostar IRAS 04169+2702
• Transition from ordered pinched to warped magnetic field on a 100 au scale in the Class 0 protostar B335
• JCMT POL-2 and ALMA polarimetric observations of 6000-100 au scales in the protostar B335: linking magnetic field and gas kinematics in observations and MHD simulations
• Magnetohydrodynamics of protoplanetary discs
• Protostellar collapse: regulation of the angular momentum and onset of an ionic precursor

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