We are excited to present the 12th edition of our (fully virtual) colloquium series! Here, we will celebrate the research and leadership by Indian women Astronomers and Cosmologists across the globe. Please use this zoom link to attend the talk. Abstract: One of the biggest issue in stellar evolution is understanding the different evolutionary paths of massive stars leading to variety of explosions, such as supernovae, GRBs etc. This remains an unsolved problem despite decades of study. Massive stars, unlike their low mass counterparts, have no mapping between their initial to final mass due to extreme mass-loss processes, significantly altering the original nature of the progenitor. At the same time mass-loss plays a critical role in the final explosive outcome. Strong dependence of mass-loss on binarity, magnetism, rotation and metallicity, combined with lack of understanding towards the dying moments of progenitors worsens the issue. Circumstellar interaction of the explosion ejecta with the surrounding winds, created via the mass-loss from the massive progenitors, remains the best probe to unravel the mass loss history of the progenitors unraveling the complex nature of their progenitors. In this talk, I will discuss the state of art multi wavelength study of the circumstellar interaction of various supernovae. These studies not only allow us to glimpse into this critical parameter at a time stamp but also probe the evolution of mass-loss across different time scales and carries foot prints of various advanced nuclear burning processes, role of binarity, magnetism etc.
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