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Short Gamma-Ray Bursts (GRBs) are often associated with NSNS or BHNS mergers.The discovery of GW/GRB 170817A has enhanced our understanding, revealing thatthe interaction between relativistic jets and post-merger outflows influencesthe observed radiation. However, the nature of compact binary merger eventsuggests that the system can be more complex than the uniform jet interactingwith a homologously expanding wind. We consider here an improved scenario byperforming a set of two-dimensional, large scale numerical simulations, and weinvestigate the interaction between short GRB jets and post-merger disk windoutflows. We focus on two types of configurations, arising from NSNS and BHNSmergers. The simulations consider the effects of the r-process nucleosynthesisin the accretion disk wind on its pressure profile. The main properties of thejet, such as its energy distribution and collimation degree, are estimated fromour simulations. We found that a) the impact of the r-process on initial windpressure leads to significant changes in the jet collimation and cocoonexpansion; b) the angular structure of thermal and kinetic energy components inthe jets, cocoons, and winds differ with respect to simple homologous models,hence it would affect the predictions of GRB afterglow emission; c) thetemporal evolution of the structure reveals conversion of thermal to kineticenergy being different for each component in the system (jet, cocoon, andwind); d) post-merger environments influence energy structure and materialdispersion, altering the interaction between jets and disk winds. %Our studyunderscores the importance of post-merger disk wind in the jet propagation,emphasizing the need for careful parameter selection to avoid interpretationdegeneracy in the electromagnetic counterparts.

The large-scale interaction between short GRB jets and disk outflows from NSNS and BHNS mergers