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Binary neutron star mergers are believed to eject significant masses with adiverse range of velocities. Once these ejected materials begin to bedecelerated by a homogeneous medium, relativistic electrons are mainly cooleddown by synchrotron radiation, generating a multiwavelength long-livedafterglow. Analytic and numerical methods illustrate that the outermost matter,the merger shock-breakout material, can be parametrized by power-law velocitydistributions $\propto \left(\beta_{\rm c}\Gamma \right)^{-\alpha_s}$.Considering that the shock-breakout material is moving on-axis towards theobserver and the relativistic jet off-axis, we compute the light curves duringthe relativistic and the lateral expansion phase. As a particular case, wesuccessfully describe the X-ray, optical and radio light curves alongside thespectral energy distribution from the recently discovered gravitational-wavetransient GW170817, when the merger shock-breakout material moves with mildlyrelativistic velocities near-Newtonian phase and the jet with relativisticvelocities. Future electromagnetic counterpart observations of this binarysystem could be able to evaluate different properties of these light curves.

Light curves of a shock-breakout material and a relativistic off-axis jet from a Binary Neutron Star system