Journal Article

Clumps and axisymmetric features in debris discs

Ing-Guey Jiang and Li-Chin Yeh

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 3, pages 2859-2875
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18908.x
Clumps and axisymmetric features in debris discs

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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.

Keywords: methods: numerical; protoplanetary discs; stars: kinematics and dynamics; planetary systems; ISM: kinematics and dynamics; ISM: structure

Journal Article.  6412 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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