The importance of episodic accretion for low-mass star formation

Abstract

A star acquires much of its mass by accreting material from a disc. Accretion is probably not continuous but episodic. We have developed a method to include the effects of episodic accretion in simulations of star formation. Episodic accretion results in bursts of radiative feedback, during which a protostar is very luminous, and its surrounding disc is heated and stabilised. These bursts typically last only a few hundred years. In contrast, the lulls between bursts may last a few thousand years; during these lulls the luminosity of the protostar is very low, and its disc cools and fragments. Thus, episodic accretion enables the formation of low-mass stars, brown dwarfs and planetary-mass objects by disc fragmentation. If episodic accretion is a common phenomenon among young protostars, then the frequency and duration of accretion bursts may be critical in determining the low-mass end of the stellar initial mass function.

To appear in the Astrophysical Journal. Press release available at: http://www.astro.cf.ac.uk/pub/Dimitrios.Stamatellos/News/News.html Full resolution paper available at http://stacks.iop.org/0004-637X/730/32

References in corpus (16)

• SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
• Accretion disc viscosity: how big is alpha?
• The properties of brown dwarfs and low-mass hydrogen-burning stars formed by disc fragmentation
• The Effects of Radiative Transfer on Low-Mass Star Formation
• The Importance of Radiative Feedback for the Stellar Initial Mass Function
• Brown dwarf formation by gravitational fragmentation of massive, extended protostellar discs
• The minimum mass for star formation, and the origin of binary brown dwarfs
• Radiative transfer and the energy equation in SPH simulations of star formation
• The Hot Inner Disk of FU Ori
• Can giant planets form by gravitational fragmentation of discs?
• Radiation Feedback and Fragmentation in Massive Protostellar Cores
• SEREN - A new SPH code for star and planet formation simulations
• Tidally induced brown dwarf and planet formation in circumstellar discs
• Introducing a Hybrid Method of Radiative Transfer for Smoothed Particle Hydrodynamics
• High Resolution Near-Infrared Spectroscopy of FUors and FUor-like stars
• Simulating star formation in molecular cloud cores IV. The role of turbulence and thermodynamics

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