Clumps and axisymmetric features in debris discs

This paper studies the structures of debris discs, focusing on the conditions that can form an axisymmetric-looking outer disc from systems with inner clumps. The main conclusion is that as long as the dominated dust grains are smaller than the blowout size, it is easy to form an axisymmetric-lookin...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2011-08, Vol.415 (3), p.2859-2875
Main Authors: Jiang, Ing-Guey, Yeh, Li-Chin
Format: Article
Language:English
Subjects:
Accretion disks
Astronomy
Astrophysics
Earth, ocean, space
Exact sciences and technology
ISM: kinematics and dynamics
ISM: structure
methods: numerical
planetary systems
protoplanetary discs
Stars & galaxies
stars: kinematics and dynamics
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Summary:This paper studies the structures of debris discs, focusing on the conditions that can form an axisymmetric-looking outer disc from systems with inner clumps. The main conclusion is that as long as the dominated dust grains are smaller than the blowout size, it is easy to form an axisymmetric-looking outer debris disc, which is part of a quasi-steady state of the whole system. This quasi-steady state is established through the balance between grain generations and a continuous outflow of grains. Assuming there is an event that starts planetesimal collisions and the corresponding grain generations, this balance can be approached in a few thousand years. This result suggests that a quasi-steady-state picture could solve the possible mass budget problem of Vega's outer debris disc.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2011.18908.x