The stellar mass-accretion rate relation in T Tauri stars and brown dwarfs

Abstract

Recent observations show a strong correlation between stellar mass and accretion rate in young stellar and sub-stellar objects, with the scaling ${\dot{M}}_{acc}\propto M_{\ast }^2$ holding over more than four 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 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 parametrization for a shut-off 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.

arXiv comment4 pages, 2 figures. Accepted for publication in ApJ Letters

References in corpus (15)

• Spectral Energy Distributions of T Tauri Stars With Passive Circumstellar Disks
• Accretion in Young Stellar/Substellar Objects
• Accretion in Brown Dwarfs: an Infrared View
• The T Tauri Phase Down to Nearly Planetary Masses: Echelle Spectra of 82 Very Low Mass Stars and Brown Dwarfs
• Measuring Accretion in Young Substellar Objects: Approaching the Planetary Mass Regime
• Photoevaporation of Circumstellar Disks around Young Stars
• Evidence for a T Tauri Phase in Young Brown Dwarfs
• A Disk Census for Young Brown Dwarfs
• Exploring Brown Dwarf Disks
• First Detection of Millimeter Dust Emission from Brown Dwarf Disks
• Dispersion in the lifetime and accretion rate of T Tauri discs
• Bondi-Hoyle Accretion in a Turbulent Medium
• Constraints on the ionizing flux emitted by T Tauri stars
• A Solution to the Protostellar Accretion Problem
• X-ray emission from young brown dwarfs in the Orion Nebula Cluster

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