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Title:
Dust dynamics during protoplanetary disc clearing
Authors:
Alexander, R. D.; Armitage, P. J.
Affiliation:
AA(JILA, University of Colorado, Boulder, CO 80309-0440, USA), AB(JILA, University of Colorado, Boulder, CO 80309-0440, USA; Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0391, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 375, Issue 2, pp. 500-512. (MNRAS Homepage)
Publication Date:
02/2007
Origin:
MNRAS
MNRAS Keywords:
accretion, accretion discs , circumstellar matter , planetary systems: formation , planetary systems: protoplanetary discs , stars: pre-main-sequence
DOI:
10.1111/j.1365-2966.2006.11341.x
Bibliographic Code:
2007MNRAS.375..500A

Abstract

We consider the dynamics of dust and gas during the clearing of protoplanetary discs. We work within the context of a photoevaporation/viscous model for the evolution of the gas disc, and use a two-fluid model to study the dynamics of dust grains as the gas disc is cleared. Small (<~10μm) grains remain well coupled to the gas, but larger (~1 mm) grains are subject to inward migration from large radii (~50 au), suggesting that the time-scale for grain growth in the outer disc is ~104-105 yr. We describe in detail the observable appearance of discs during clearing, and find that pressure gradients in the gas disc result in a strong enhancement of the local dust-to-gas ratio in a ring near to the inner disc edge. Lastly, we consider a simple model of the disc-planet interaction, and suggest that observations of disc masses and accretion rates provide a straightforward means of discriminating between different models of disc clearing.
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