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Evolution of Gamma-Ray Burst Progenitors at Low Metallicity
Sung-Chul Yoon, Norbert Langer
Despite the growing evidence that long Gamma-Ray Bursts (GRBs) are associated with deaths of Wolf-Rayet stars, the evolutionary path of massive stars to GRBs and the exact nature o…
Evolution of rapidly rotating metal-poor massive stars towards gamma-ray bursts
Sung-Chul Yoon, Norbert Langer
Recent models of rotating massive stars including magnetic fields prove it difficult for the cores of single stars to retain enough angular momentum to produce a collapsar and gamm…
Which Massive stars are Gamma-Ray Burst Progenitors?
Jelena Petrovic, Norbert Langer, Sung-Chul Yoon +1
The collapsar model for gamma-ray bursts requires three essential ingredients: a massive core, removal of the hydrogen envelope, and enough angular momentum in the core. We study c…
On the evolution of rapidly rotating massive white dwarfs towards supernovae or collapses
Sung-Chul Yoon, Norbert Langer
A recent study by Yoon & Langer (2004a) indicated that the inner cores of rapidly accreting (Mdot > 10^{-7} M_sun/yr) CO white dwarfs may rotate differentially, with a shear rate n…
Stabilization of helium shell burning by rotation in accreting white dwarfs
Sung-Chul Yoon, Norbert Langer
The currently favored scenario for the progenitor evolution of Type Ia supernovae (SNe Ia) presumes that white dwarfs in close binary systems grow to the Chandrasekhar limit via ma…