High-energy neutrino emission from tidal disruption event outflow-cloud interactions

Tidal disruption events (TDEs), characterized by their luminous transients and high-velocity outflows, have emerged as plausible sources of high-energy neutrinos contributing to the diffuse neutrino. In this study, we calculate the contribution of TDEs to the diffuse neutrino by employing the outflow-cloud model within the TDE framework. Our analysis indicates that the contribution of TDEs becomes negligible when the redshift $Z$ exceeds 2. Employing a set of fiducial values, which includes outflow energy $E_{\mathrm{k}\mathrm{i}\mathrm{n}}={10}^{51}$ erg, a proton spectrum cutoff energy $E_{\mathrm{p},\mathrm{m}\mathrm{a}\mathrm{x}}=100$ PeV, a volume TDE rate $\dot{N}=8\times {10}^{-7}\mathrm{M}\mathrm{p}{\mathrm{c}}^{-3}\mathrm{y}\mathrm{e}\mathrm{a}{\mathrm{r}}^{-1}$, covering fraction of clouds $C_V=0.1$, energy conversion efficiency in the shock $\eta =0.1$, and a proton spectrum index $\mathrm{\Gamma }=-1.7$, we find that TDEs can account for approximately 80% of the contribution at energies around 0.3 PeV. Additionally, TDEs still contribute around 18% to the IceCube data below 0.1 PeV and the total contribution is $\sim 24_{-15}^{+2}\mathrm{\%}$. In addition, we also discuss the potential influence of various parameter values on the results in detail. With the IceCube data, we impose constraints on the combination of the physical parameters, i.e., $C_f=\dot{N}{E}_{\mathrm{k}\mathrm{i}\mathrm{n}}{C}_{\mathrm{v}}\eta$. Future observations or theoretical considerations would fix some physical parameters, which will help to constrain some individual parameters of TDEs.