Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-11
Astrophys.J.664:1011-1025,2007
Astronomy and Astrophysics
Astrophysics
23 pages, 18 figures; accepted for publication in ApJ
Scientific paper
10.1086/518761
We investigate the properties and evolution of accretion tori formed after the coalescence of two compact objects. At these extreme densities and temperatures, the accreting torus is cooled mainly by neutrino emission produced primarily by electron and positron capture on nucleons (beta reactions). We solve for the disc structure and its time evolution by introducing a detailed treatment of the equation of state which includes photodisintegration of helium, the condition of beta-equilibrium, and neutrino opacities. We self-consistently calculate the chemical equilibrium in the gas consisting of helium, free protons, neutrons and electron-positron pairs and compute the chemical potentials of the species, as well as the electron fraction throughout the disc. We find that, for sufficiently large accretion rates (> 10 solar masses per second), the inner regions of the disk become opaque and develop a viscous and thermal instability. The identification of this instability might be relevant for GRB observations.
Di Matteo Tiziana
Janiuk Agnieszka
Perna Rosalba
Yuan Ye-Fei
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