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Title: Radial Transport and Meridional Circulation in Accretion Disks

Abstract

Radial transport of particles, elements and fluid driven by internal stresses in three-dimensional (3D) astrophysical accretion disks is an important phenomenon, potentially relevant for the outward dust transport in protoplanetary disks, origin of the refractory particles in comets, isotopic equilibration in the Earth–Moon system, etc. To gain better insight into these processes, we explore the dependence of meridional circulation in 3D disks with shear viscosity on their thermal stratification, and demonstrate a strong effect of the latter on the radial flow. Previous locally isothermal studies have normally found a pattern of the radial outflow near the midplane, switching to inflow higher up. Here we show, both analytically and numerically, that a flow that is inward at all altitudes is possible in disks with entropy and temperature steeply increasing with height. Such thermodynamic conditions may be typical in the optically thin, viscously heated accretion disks. Disks in which these conditions do not hold should feature radial outflow near the midplane, as long as their internal stress is provided by the shear viscosity. Our results can also be used for designing hydrodynamical disk simulations with a prescribed pattern of the meridional circulation.

Authors:
 [1];  [2]
  1. Department of Astrophysical Sciences, Princeton University, Ivy Lane, Princeton, NJ 08540 (United States)
  2. Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540 (United States)
Publication Date:
OSTI Identifier:
22661298
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 837; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; ALTITUDE; ASTROPHYSICS; COMETS; DUSTS; ENTROPY; GAIN; HYDRODYNAMICS; PROTOPLANETS; REFRACTORIES; RESIDUAL STRESSES; SIMULATION; STRATIFICATION; THERMODYNAMICS; THREE-DIMENSIONAL CALCULATIONS; VISCOSITY

Citation Formats

Philippov, Alexander A., and Rafikov, Roman R., E-mail: sashaph@princeton.edu. Radial Transport and Meridional Circulation in Accretion Disks. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA60CA.
Philippov, Alexander A., & Rafikov, Roman R., E-mail: sashaph@princeton.edu. Radial Transport and Meridional Circulation in Accretion Disks. United States. doi:10.3847/1538-4357/AA60CA.
Philippov, Alexander A., and Rafikov, Roman R., E-mail: sashaph@princeton.edu. Fri . "Radial Transport and Meridional Circulation in Accretion Disks". United States. doi:10.3847/1538-4357/AA60CA.
@article{osti_22661298,
title = {Radial Transport and Meridional Circulation in Accretion Disks},
author = {Philippov, Alexander A. and Rafikov, Roman R., E-mail: sashaph@princeton.edu},
abstractNote = {Radial transport of particles, elements and fluid driven by internal stresses in three-dimensional (3D) astrophysical accretion disks is an important phenomenon, potentially relevant for the outward dust transport in protoplanetary disks, origin of the refractory particles in comets, isotopic equilibration in the Earth–Moon system, etc. To gain better insight into these processes, we explore the dependence of meridional circulation in 3D disks with shear viscosity on their thermal stratification, and demonstrate a strong effect of the latter on the radial flow. Previous locally isothermal studies have normally found a pattern of the radial outflow near the midplane, switching to inflow higher up. Here we show, both analytically and numerically, that a flow that is inward at all altitudes is possible in disks with entropy and temperature steeply increasing with height. Such thermodynamic conditions may be typical in the optically thin, viscously heated accretion disks. Disks in which these conditions do not hold should feature radial outflow near the midplane, as long as their internal stress is provided by the shear viscosity. Our results can also be used for designing hydrodynamical disk simulations with a prescribed pattern of the meridional circulation.},
doi = {10.3847/1538-4357/AA60CA},
journal = {Astrophysical Journal},
number = 2,
volume = 837,
place = {United States},
year = {Fri Mar 10 00:00:00 EST 2017},
month = {Fri Mar 10 00:00:00 EST 2017}
}