Precession of neutrino-cooled accretion disks in gamma-ray burst engines

Reynoso, Matias M.; Romero, Gustavo E.; Sampayo, Oscar A.

Precession of neutrino-cooled accretion disks in gamma-ray burst engines

Authors

Reynoso, Matias M.

Romero, Gustavo E.

Sampayo, Oscar A.

Description

We study the precession of accretion disks in the context of gamma-ray burst inner engines. With an accretion disk model that allows for neutrino cooling, we evaluate the possible periods of disk precession and nutation due to the Lense-Thirring effect. Assuming jet ejection perpendicular to the disk midplane and a typical intrinsic time dependence for the burst, we find possible gamma-ray light curves with temporal microstructure similar to what is observed in some subsamples. We conclude that the precession and nutation of a neutrino-cooled accretion disk in the burst engine might be responsible for some events, especially those with a slow rise and a fast decay.
7 pages, 8 figures, accepted for publication in A&A