Speaker
Albino Perego
(TU-Darmstadt)
Description
Binary neutron star mergers are among the most extreme events happening in the Universe.
These powerful events are expected to release large amounts of energy in form of neutrinos,
gravitational waves and electromagnetic radiation, together with the ejection of a small
fraction of their original mass.
In particular, they are expected to be sites for r-process nucleosynthesis, as well as very
promising candidates to power short-hard gamma-ray bursts (GRBs) and the newly
discovered kilo/macro-novae. Despite the central role played by neutrinos in this scenario, their role is still unclear and more investigations are required.
In this talk, I will present results from 3D simulation of the aftermath of a binary neutron
star merger. The dynamics of the disc will be investigated, as well as the neutrino emission
coming from the central object and the innermost part of the accreting disc.
The interaction between the disc and the neutrino radiation produces a neutrino-driven wind
on a timescale of a few tens of milliseconds after the merger. Inside the wind,
the electron fraction of the matter (initially extremely neutron rich) is reset by
neutrino absorption.
The properties of the related ejecta will be explored, with a special emphasis on the
nucleosynthesis yields and on their dependences on microphysics inputs.
Implication of the wind in terms for the central engine of short GRBs will also be discussed.
Primary author
Albino Perego
(TU-Darmstadt)
