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• W4293088535 endingPage "A56" @default.
• W4293088535 startingPage "A56" @default.
• W4293088535 abstract "Protoplanetary discs are poorly ionised due to their low temperatures and high column densities and are therefore subject to three “non-ideal” magnetohydrodynamic (MHD) effects: Ohmic dissipation, ambipolar diffusion, and the Hall effect. The existence of magnetically driven turbulence in these discs has been a central question since the discovery of the magnetorotational instability (MRI). Early models considered Ohmic diffusion only and led to a scenario of layered accretion, in which a magnetically “dead” zone in the disc midplane is embedded within magnetically “active” surface layers at distances of about 1–10 au from the central protostellar object. Recent work has suggested that a combination of Ohmic dissipation and ambipolar diffusion can render both the midplane and surface layers of the disc inactive and that torques due to magnetically driven outflows are required to explain the observed accretion rates. We reassess this picture by performing three-dimensional numerical simulations that include all three non-ideal MHD effects for the first time. We find that the Hall effect can generically “revive” dead zones by producing a dominant azimuthal magnetic field and a large-scale Maxwell stress throughout the midplane, provided that the angular velocity and magnetic field satisfy Ω·B > 0. The attendant large magnetic pressure modifies the vertical density profile and substantially increases the disc scale height beyond its hydrostatic value. Outflows are produced but are not necessary to explain accretion rates ≲ 10-7 M⊙ yr-1. The flow in the disc midplane is essentially laminar, suggesting that dust sedimentation may be efficient. These results demonstrate that if the MRI is relevant for driving mass accretion in protoplanetary discs, one must include the Hall effect to obtain even qualitatively correct results." @default.
• W4293088535 created "2022-08-26" @default.
• W4293088535 creator A5070183453 @default.
• W4293088535 creator A5080665118 @default.
• W4293088535 creator A5089298782 @default.
• W4293088535 date "2014-06-01" @default.
• W4293088535 modified "2023-10-18" @default.
• W4293088535 title "Thanatology in protoplanetary discs" @default.
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• W4293088535 doi "https://doi.org/10.1051/0004-6361/201423660" @default.
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