Jul 5 – 10, 2021
Europe/Rome timezone

Probing the progenitors of spinning binary black-hole mergers with long gamma-ray bursts

Jul 5, 2021, 7:00 PM
25m
Invited talk in the parallel session Explosive events associated with compact-object binary mergers Explosive Events Associated with Compact-Object Binary Mergers

Speaker

Tassos Fragos (University of Geneva)

Description

Long gamma-ray bursts are associated with the core-collapse of massive, rapidly spinning stars. However, the believed efficient angular momentum transport in stellar interiors leads to predominantly slowly-spinning stellar cores. In this talk, I will report on binary stellar evolution and population synthesis calculations, showing that tidal interactions in close binaries not only can explain the observed sub-population of spinning, merging binary black holes, but also lead to long gamma-ray bursts at the time of black-hole formation, with rates matching the empirical ones. We find that ~10% of the GWTC-2 reported binary black holes had a long gamma-ray burst associated with their formation, with GW190517 and GW190719 having the highest probability of being among them.

Primary author

Tassos Fragos (University of Geneva)

Presentation materials

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