| Abstract : | GW170817 is the first binary neutron star merger detected in gravitational waves and photons, giving rise to the field gravitational-wave multi-messenger astronomy. The initial UV-optical-IR emission, termed the kilonova, verified that binary mergers are also sites for production of heavy elements in the universe, apart from the already known supernova mechanism. A delayed X-ray and radio non-thremal afterglow was observed from this source. Radio observations of the non-thermal (afterglow) emission have provided crucial insights into the structured jet launched after the merger, the geometry of the merger, and the density of the circum-merger environment. The kilonova ejecta is hypothesized to interact with the interstellar medium at late times to produce non-thermal emission that will be visible in the radio wavelengths. I will be presenting our published late time radio observations of GW170817 carried out in search for the expected kilonova afterglow rebrightening. I will also discuss the constraints these observations have placed on the properties of the dynamical ejecta and the neutron star equation of state. |
