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Title:
The Stellar Mass-Accretion Rate Relation in T Tauri Stars and Brown Dwarfs
Authors:
Alexander, Richard D.; Armitage, Philip J.
Affiliation:
AA(JILA, 440 UCB, University of Colorado, Boulder, CO 80309-0440 .), AB(JILA, 440 UCB, University of Colorado, Boulder, CO 80309-0440 .; Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0391.)
Publication:
The Astrophysical Journal, Volume 639, Issue 2, pp. L83-L86. (ApJL Homepage)
Publication Date:
03/2006
Origin:
UCP
ApJ Keywords:
Accretion, Accretion Disks, Stars: Planetary Systems: Protoplanetary Disks, Stars: Low-Mass, Brown Dwarfs, Stars: Pre-Main-Sequence
DOI:
10.1086/503030
Bibliographic Code:
2006ApJ...639L..83A

Abstract

Recent observations show a strong correlation between stellar mass and accretion rate in young stellar and substellar objects, with the scaling M˙acc~M2* holding over more than 4 orders of magnitude in accretion rate. We explore the consequences of this correlation in the context of disk evolution models. We note that such a correlation is not expected to arise from variations in disk angular momentum transport efficiency with stellar mass, and we suggest that it may reflect a systematic trend in disk initial conditions. In this case we find that brown dwarf disks initially have rather larger radii than those around more massive objects. By considering disk evolution, and invoking a simple parameterization for a shutoff in accretion at the end of the disk lifetime, we show that such models predict that the scatter in the stellar mass-accretion rate relationship should increase with increasing stellar mass, in rough agreement with current observations.
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