期刊
ASTROPHYSICAL JOURNAL
卷 730, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/730/1/32
关键词
accretion, accretion disks; brown dwarfs; hydrodynamics; methods: numerical; radiative transfer; stars: formation; stars: low-mass; stars: protostars
资金
- STFC [PP/E000967/1]
- Leverhume Trust [F/00 118/BJ]
- STFC [PP/E000967/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E000967/1] Funding Source: researchfish
A star acquires much of its mass by accreting material from a disk. 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 disk is heated and stabilized. 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 disk cools and fragments. Thus, episodic accretion enables the formation of low-mass stars, brown dwarfs, and planetary-mass objects by disk 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.
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