http://arxiv.org/abs/2209.11005
Three tidal disruption event (TDE) candidates (AT2019dsg, AT2019fdr, AT2019aalc) have been found to be coincident with high energy astrophysical neutrinos in multi-messenger follow-ups. Recent studies suggest the presence of a quasi-spherical, optically thick envelope around the supermassive black holes in TDEs, resulted from stellar debris after the disruption. We study whether the neutrino signal can be explained by choked relativistic jets inside the envelope. While powerful jets, such as that in Swift J1644+57, can successfully break out the envelope, those with relatively weak power could be choked by the envelope. Choked jets can still accelerate cosmic rays through internal shocks or reverse shocks deep in the envelope, which further produce high-energy neutrinos via interaction with the thermal photons in the envelope. We explore the parameter space of the jets that can produce detectable neutrino flux while being choked. Under reasonable assumption about the envelope mass, we find that the cumulative neutrino numbers of three TDEs are consistent with the expected range imposed by observations. Compared with other proposed models, the relativistic bulk motion of the jets in our model can magnify the neutrino flux by Lorentz boosting. The neutrino time delay relative to the optical peak time of TDEs can be explained as the jet propagation time in the envelope before being choked. The discovery of TDE-associated neutrino events may suggest that jets might have been commonly formed in TDEs, as expected from super-Eddington accretion, but most of them are too weak to break out of the envelopes.
J. Zheng, X. Wang and R. Liu
Fri, 23 Sep 22
18/70
Comments: 9 pages, 4 figures, submitted, comments are welcome
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