Speaker
Description
The potential association between the tidal disruption event (TDE) AT2019dsg and high-energy astrophysical neutrinos implies the acceleration of cosmic rays. In addition to neutrinos, these accelerated particles could initiate electromagnetic (EM) emissions spanning from radio, optical/UV, X-ray to GeV energies by leptonic and hadronic processes. In this talk, I will present our recent results on the joint analysis of the neutrino and EM cascade emissions from neutrino-coincident TDEs in an isotropic wind model. I will show that the Fermi gamma-ray upper limits could constrain the size of the radiation zone and the maximum energies of accelerated cosmic rays. Moreover, I will discuss our latest work on modeling the multi-wavelength emissions from the jetted TDE AT2022cmc. We systematically study the dynamics of the jet and wind in an external density profile, considering the continuous energy injection rate associated with the time-dependent accretion rates before and after the mass fallback time. We investigate the multi-wavelength emissions from both the jet’s forward shock and reverse shock regions, as well as from the wind, in a self-consistent manner. I will show that the X-ray spectra and fast-decaying light curves extending to 400 days after the disruption can be well described by the electron synchrotron emission from the jet’s reverse shock.
