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Episodic accretion, radiative feedback, and their role in low-mass star formation

Stamatellos, Dimitrios, Hubber, David and Whitworth, Anthony Peter 2012. Episodic accretion, radiative feedback, and their role in low-mass star formation. Presented at: 9th Pacific Rim Conference on Stellar Astrophysics (PRCSA 2011), Lijian, China, 14-20 April 2011. Published in: Qian, Shengbang ed. 9th Pacific Rim Conference on Stellar Astrophysics (PRCSA 2011), Lijian, China, 14-20 April 2011. Astronomical Society of the Pacific Conference Series , vol. 451. San Francisco: Astronomical Society of the Pacific, pp. 213-218.

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Abstract

It is speculated that the accretion of material onto young protostars is episodic. We present a computational method to include the effects of episodic accretion in radiation hydrodynamic simulations of star formation. We find that during accretion events protostars are “switched on", heating and stabilising the discs around them. However, these events typically last only a few hundred years, whereas the intervals in between them may last for a few thousand years. During these intervals, the protostars are effectively “switched off", allowing gravitational instabilities to develop in their discs and induce fragmentation. Thus, episodic accretion promotes disc fragmentation, enabling the formation of low-mass stars, brown dwarfs and planetary-mass objects. The frequency and the duration of episodic accretion events may be responsible for the low-mass end of the IMF, i.e. for more than 60% of all stars.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Astronomical Society of the Pacific
ISBN: 9781583817841
Related URLs:
Last Modified: 04 Jun 2017 03:38
URI: http://orca.cf.ac.uk/id/eprint/24183

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