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• W2486209213 endingPage "L8" @default.
• W2486209213 startingPage "L8" @default.
• W2486209213 abstract "The formation of protoplanetary disks during the collapse of molecular dense cores is significantly influenced by angular momentum transport, notably by the magnetic torque. In turn, the evolution of the magnetic field is determined by dynamical processes and non-ideal MHD effects such as ambipolar diffusion. Considering simple relations between various timescales characteristic of the magnetized collapse, we derive an expression for the early disk radius, where M is the total disk plus protostar mass, is the ambipolar diffusion coefficient, and Bz is the magnetic field in the inner part of the core. This is significantly smaller than the disks that would form if angular momentum was conserved. The analytical predictions are confronted against a large sample of 3D, non-ideal MHD collapse calculations covering variations of a factor 100 in core mass, a factor 10 in the level of turbulence, a factor 5 in rotation, and magnetic mass-to-flux over critical mass-to-flux ratios 2 and 5. The disk radius estimates are found to agree with the numerical simulations within less than a factor 2. A striking prediction of our analysis is the weak dependence of circumstellar disk radii upon the various relevant quantities, suggesting weak variations among class-0 disk sizes. In some cases, we note the onset of large spiral arms beyond this radius." @default.
• W2486209213 created "2016-08-23" @default.
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• W2486209213 date "2016-10-05" @default.
• W2486209213 modified "2023-10-02" @default.
• W2486209213 title "MAGNETICALLY SELF-REGULATED FORMATION OF EARLY PROTOPLANETARY DISKS" @default.
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• W2486209213 doi "https://doi.org/10.3847/2041-8205/830/1/l8" @default.
• W2486209213 hasPublicationYear "2016" @default.
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