Abstract
We have sub-classified short and long-duration gamma-ray bursts (GRBs) into seven families according to the binary nature of their progenitors. Short GRBs are produced in mergers of neutron-star binaries (NS-NS) or neutron star-black hole binaries (NS-BH). Long GRBs are produced via the induced gravitational collapse (IGC) scenario occurring in a tight binary system composed of a carbon-oxygen core (COcore) and a NS companion. The COcore explodes as type Ic supernova (SN) leading to a hypercritical accretion process onto the NS: if the accretion is sufficiently high the NS reaches the critical mass and collapses forming a BH, otherwise a massive NS is formed. Therefore long GRBs can lead either to NS-BH or to NS-NS binaries depending on the entity of the accretion. We discuss for the above compact-object binaries: 1) the role of the NS structure and the nuclear equation of state; 2) the occurrence rates obtained from X and gamma-rays observations; 3) the predicted annual number of detections by the Advanced LIGO interferometer of their gravitational-wave emission.
Highlights
There has been a traditional phenomenological classification of gamma-ray bursts (GRBs) based on the observed prompt duration, T90: long GRBs for T90 > 2 s and short GRBs for T90 < 2 s[1,2,3,4,5]
Progress has been made in the meantime in the understanding of the nature of both long and short GRBs leading to a physical, instead of empirical, classification of GRBs based on the progenitor systems [6,7,8]
In the case of long GRBs we stand on the induced gravitational collapse (IGC) scenario that introduces as their progenitors short-period binaries composed of a carbon-oxygen core (COcore) with a NS companion [9,10,11,12,13,14,15]
Summary
There has been a traditional phenomenological classification of gamma-ray bursts (GRBs) based on the observed prompt duration, T90: long GRBs for T90 > 2 s and short GRBs for T90 < 2 s[1,2,3,4,5]. Progress has been made in the meantime in the understanding of the nature of both long and short GRBs leading to a physical, instead of empirical, classification of GRBs based on the progenitor systems [6,7,8]
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