Effects of the temperature dependence of the in-medium nucleon mass on core-collapse supernovae

Aims. A complete description of the core collapse supernova mechanism requires an appropriate treatment of both the hydrodynamics and the microphysics. We study the influence of a nuclear physics input, namely the temperature dependence of the nucleon effective mass in nuclei induced by the in-mediu...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2012-05, Vol.541, p.A30
Main Authors: Fantina, A. F., Blottiau, P., Margueron, J., Mellor, Ph, Pizzochero, P. M.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Earth, ocean, space
equation of state
Exact sciences and technology
hydrodynamics
methods: numerical
Nuclear Theory
Physics
Sciences of the Universe
Solar and Stellar Astrophysics
supernovae: general
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Summary:Aims. A complete description of the core collapse supernova mechanism requires an appropriate treatment of both the hydrodynamics and the microphysics. We study the influence of a nuclear physics input, namely the temperature dependence of the nucleon effective mass in nuclei induced by the in-medium effects, in the core collapse of a massive star. Methods. We present here the first implementation of this nuclear input in a hydrodynamical one-dimensional simulation. The simulations are performed with a spherically symmetric Newtonian model, with neutrino transport treated in the multi-group flux-limited diffusion approximation. Results. The inclusion of the temperature dependence of the in-medium nucleon mass has an impact on the equation of state of the system and reduces the deleptonisation during the collapse. This results in a non-negligible effect on the shock wave energetics. The shock wave is formed more outwards, and in the first few milliseconds after bounce the shock front has propagated further out.
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361/201118187