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The Origin of Episodic Accretion Bursts in the Early Stages of Star Formation | | E. I. Vorobyov
; Shantanu Basu
; | | Date: |
1 Oct 2005 | | Subject: | astro-ph | | Affiliation: | 1 and 2) and Shantanu Basu ( University of Western Ontario, Canada, Rostov Institute of Physics, Russia | | Abstract: | We study numerically the evolution of rotating cloud cores, from the collapse of a magnetically supercritical core to the formation of a protostar and the development of a protostellar disk during the main accretion phase. We find that the disk quickly becomes unstable to the development of a spiral structure similar to that observed recently in AB Aurigae. A continuous infall of matter from the protostellar envelope makes the protostellar disk unstable, leading to spiral arms and the formation of dense protostellar/protoplanetary clumps within them. The growing strength of spiral arms and ensuing redistribution of mass and angular momentum creates a strong centrifugal disbalance in the disk and triggers bursts of mass accretion during which the dense protostellar/protoplanetary clumps fall onto the central protostar. These episodes of clump infall may manifest themselves as episodes of vigorous accretion rate (ge 10^{-4} M_sun/yr) as is observed in FU Orionis variables. Between these accretion bursts, the protostar is characterized by a low accretion rate (< 10^{-6} M_sun/yr). During the phase of episodic accretion, the mass of the protostellar disk remains less than or comparable to the mass of the protostar. | | Source: | arXiv, astro-ph/0510014 | | Services: | Forum | Review | PDF | Favorites | |
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