Numerical simulations of the jetted tidal disruption event Swift J1644+57

TL;DR

This paper details the numerical simulation techniques for modeling the non-thermal emission of the jetted tidal disruption event Swift J1644+57, focusing on relativistic hydrodynamics and radiative transfer coupling.

Contribution

It provides a comprehensive analysis of the technical challenges and solutions in simulating relativistic jets and their light curves for tidal disruption events.

Findings

Dependence of light curves on numerical parameters in 1D simulations

Tradeoff strategies for 2D simulations balancing accuracy and computational cost

Insights into the coupling of hydrodynamics and radiative transfer in jet modeling

Abstract

In this work we focus on the technical details of the numerical simulations of the non- thermal transient Swift J1644+57, whose emission is probably produced by a two-component jet powered by a tidal disruption event. In this context we provide details of the coupling between the relativistic hydrodynamic simulations and the radiative transfer code. First, we consider the technical demands of one-dimensional simulations of a fast relativistic jet, and show to what extent (for the same physical parameters of the model) do the computed light curves depend on the numerical parameters of the different codes employed. In the second part we explain the difficulties of computing light curves from axisymmetric two dimensonal simulations and discuss a procedure that yields an acceptable tradeoff between the computational cost and the quality of the results.