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Title:
The effect of cooling on the global stability of self-gravitating protoplanetary discs
Authors:
Rice, W. K. M.; Armitage, P. J.; Bate, M. R.; Bonnell, I. A.
Affiliation:
AA(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS), AB(JILA, Campus Box 440, University of Colorado, Boulder CO 80309-0440, USA; Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder CO 80309-0391, USA), AC(School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL), AD(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS)
Publication:
Monthly Notice of the Royal Astronomical Society, Volume 339, Issue 4, pp. 1025-1030. (MNRAS Homepage)
Publication Date:
03/2003
Origin:
MNRAS
Astronomy Keywords:
accretion, accretion discs, stars: formation, planetary systems: formation, planetary systems: protoplanetary discs, stars: pre-main-sequence, galaxies: active
DOI:
10.1046/j.1365-8711.2003.06253.x
Bibliographic Code:
2003MNRAS.339.1025R

Abstract

Using a local model, Gammie has shown that accretion discs with cooling times tcool<=3Ω-1 fragment into gravitationally bound objects, while those with cooling times tcool > 3Ω-1 evolve into a quasi-steady state. We use three-dimensional smoothed particle hydrodynamic simulations of protoplanetary accretion discs to test if the local results hold globally. We find that for disc masses appropriate for T Tauri discs, the fragmentation boundary still occurs at a cooling time close to tcool= 3Ω-1. For more massive discs, which are likely to be present at an earlier stage of the star formation process, fragmentation occurs for longer cooling times, but still within a factor of 2 of that predicted using a local model. These results have implications not only for planet formation in protoplanetary discs and star formation in active galactic nucleus discs, but also for the redistribution of angular momentum which could be driven by the presence of relatively massive objects within the accretion disc.

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