Journal
ASTROPHYSICAL JOURNAL
Volume 768, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/768/1/34
Keywords
convection; diffusion; hydrodynamics; instabilities; planet-star interactions; stars: evolution
Categories
Funding
- NSF [CBET-0933759, AST-0807672]
- UCSC
- NSF-MRI
- Office of Science of the US Department of Energy [DE-AC03-76SF00098]
- Department of Energy Office of Science Graduate Fellowship Program (DOE SCGF)
- American Recovery and Reinvestment Act [DE-AC05-06OR23100]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0933759] Funding Source: National Science Foundation
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A region of a star that is stable to convection according to the Ledoux criterion may nevertheless undergo additional mixing if the mean molecular weight increases with radius. This process is called fingering (thermohaline) convection and may account for some of the unexplained mixing in stars such as those that have been polluted by planetary infall and those burning He-3. We propose a new model for mixing by fingering convection in the parameter regime relevant for stellar (and planetary) interiors. Our theory is based on physical principles and supported by three-dimensional direct numerical simulations. We also discuss the possibility of formation of thermocompositional staircases in fingering regions, and their role in enhancing mixing. Finally, we provide a simple algorithm to implement this theory in one-dimensional stellar codes, such as KEPLER and MESA.
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