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Université Savoie Mont Blanc Université Joseph Fourier



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Home page > PhD fellowships > Proposed PhD subjects 2016-2019 > Multidimensional Simulations of Pair Instability Supernovae Explosions

Multidimensional Simulations of Pair Instability Supernovae Explosions

by Luc Frappat - 17 December 2015

Topics:  Astrophysics, supernovae

Proponents:  Pascal Chardonnet

Address:  LAPTh - 9, chemin de Bellevue - BP 110 - 74941 ANNECY-LE-VIEUX CEDEX

Phone:  + 33 (0)450 09 17 48

Contact Email:  chardonnet@lapth.cnrs.fr


In astrophysics, the mass of star is a key factor in order to understand the fate of the progenitor. One of the main problem of supernovae observation is to determine the mass of the progenitor from the spectrum assuming some modelization. Therefore a better understanding of the hydrodynamical process of pair instability supernovae explosion is crucial. We have worked on that problem since more than 5 years developing a 1D code and a 2D hydrodynamical code. The aim of this thesis is to work on a full 3D hydrodynamical code of pair instability supernovae explosion. The proposing topic of research is related to code development and performing of numerical simulation of pair-instability supernovae (PISNe). This type of supernovae is the explosions of supermassive, up to 1000 solar masses, stars of the III generation with low metallicity, which are on the cosmological distances from the Earth in the young universe. In present time there are not many publications exist on this topic what is explained by observational difficulties. These kinds of stars are unavailable for direct observations now, but the advanced instruments are developed fastly and there is no doubt that in a few years the topic became very popular branch of astrophysics. In our group we have developed numerical code for astrophysical flows simulations based on high order piecewise-parabolic reconstruction on a local stencil (PPML) for hydrodynamics, stellar equation of state, Poisson solver for self-gravity and tracers method for post-processing calculations of nucleosynthesis. Our first results show the possibility of large-scale fragmentation of the supernova remnant. This effect could be related to a new theory of Gamma-Ray Busts (GRBs), which is being developed in our team. Numerical simulation should help to answer the question about the possibility to explain GRBs like the explosions of type PISN supernovae.