The Effects of Radiation Feedback on Early Fragmentation and Multiplicity

Details The Effects of Radiation Feedback on Early Fragmentation and Multiplicity The Effects of Radiation Feedback on Early Fragmentation and Multiplicity

2010-10-20

arxiv.org/abs/1010.4308v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 2 figures, to appear in the Proceedings of IAU Symposium 270: Computational Star Formation

Scientific paper

Forming stars emit a significant amount of radiation into their natal environment. While the importance of radiation feedback from high-mass stars is widely accepted, radiation has generally been ignored in simulations of low-mass star formation. I use ORION, an adaptive mesh refinement (AMR) three-dimensional gravito-radiation-hydrodynamics code, to model low-mass star formation in a turbulent molecular cloud. I demonstrate that including radiation feedback has a profound effect on fragmentation and protostellar multiplicity. Although heating is mainly confined within the core envelope, it is sufficient to suppress disk fragmentation that would otherwise result in low-mass companions or brown dwarfs. As a consequence, turbulent fragmentation, not disk fragmentation, is likely the origin of low-mass binaries.

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