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• W3100601897 endingPage "114" @default.
• W3100601897 startingPage "114" @default.
• W3100601897 abstract "The edges of magnetically dead zones in protostellar disks have been proposed as locations where density bumps may arise, trapping planetesimals and helping form planets. Magneto-rotational turbulence in magnetically active zones provides both accretion of gas on the star and transport of mass to the dead zone. We investigate the location of the magnetically active regions in a protostellar disk around a solar-type star, varying the disk temperature, surface density profile, and dust-to-gas ratio. We also consider stellar masses between 0.4 and 2 M☉, with corresponding adjustments in the disk mass and temperature. The dead zone's size and shape are found using the Elsasser number criterion with conductivities including the contributions from ions, electrons, and charged fractal dust aggregates. The charged species' abundances are found using the approach proposed by Okuzumi. The dead zone is in most cases defined by the ambipolar diffusion. In our maps, the dead zone takes a variety of shapes, including a fish tail pointing away from the star and islands located on and off the midplane. The corresponding accretion rates vary with radius, indicating locations where the surface density will increase over time, and others where it will decrease. We show that density bumps do not readily grow near the dead zone's outer edge, independently of the disk parameters and the dust properties. Instead, the accretion rate peaks at the radius where the gas-phase metals freeze out. This could lead to clearing a valley in the surface density, and to a trap for pebbles located just outside the metal freezeout line." @default.
• W3100601897 created "2020-11-23" @default.
• W3100601897 creator A5038027613 @default.
• W3100601897 creator A5056946991 @default.
• W3100601897 creator A5069610763 @default.
• W3100601897 creator A5080805971 @default.
• W3100601897 date "2013-02-25" @default.
• W3100601897 modified "2023-10-14" @default.
• W3100601897 title "MAGNETIZED ACCRETION AND DEAD ZONES IN PROTOSTELLAR DISKS" @default.
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