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arXiv · 2411.07925

Revisiting X-ray Afterglows of Jetted Tidal Disruption Events with the External Reverse Shock

Chengchao Yuan·Walter Winter·B. Theodore Zhang·Kohta Murase·Bing Zhang
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Abstract

We investigate the external reverse shock region of relativistic jets as the origin of X-ray afterglows of jetted tidal disruption events (TDEs) that exhibit luminous jets accompanied by fast-declining non-thermal X-ray emissions. We model the dynamics of jet propagating within an external density medium, accounting for continuous energy injection driven by accretion activities. We compute the time-dependent synchrotron and inverse Compton emissions from the reverse shock region. Our analysis demonstrates that the reverse shock scenario can potentially explain the X-ray light curves and spectra of four jetted TDEs, AT 2022cmc, Swift J1644, Swift J2058, and Swift J1112. Notably, the rapid steepening of the late-stage X-ray light curves can be attributed jointly to the jet break and cessation of the central engine as the accretion rate drops below the Eddington limit. Using parameters obtained from X-ray data fitting, we also discuss the prospects for $\gamma$-ray and neutrino detection.

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Chengchao Yuan, Walter Winter, B. Theodore Zhang, Kohta Murase, Bing Zhang. 2024-11-12. Revisiting X-ray Afterglows of Jetted Tidal Disruption Events with the External Reverse Shock. https://doi.org/10.3847/1538-4357%2Fadbbde

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