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The Effects of Radiation Feedback on Early Fragmentation and Stellar Multiplicity

Published online by Cambridge University Press:  27 April 2011

Stella S. R. Offner
Stella S. R. Offner*
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge MA 02138, USA email: [email protected]
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Abstract

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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.

Keywords

stars:formationbinarieshydrodynamicsturbulenceradiative transfer
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S270: Computational Star Formation , May 2010 , pp. 231 - 234
Copyright
Copyright © International Astronomical Union 2011

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