Exploring the core collapse supernovae at radio frequencies

by Poonam Chandra (National Centre for Radio Astrophysics of Tata Institute of Fundamental Research; Astronomy Department, Stockholm University)

Tuesday 30 Jan 2018, 13:15 → 14:15 Europe/Stockholm

FB42

Radio emission from supernovae is synchrotron in nature and is generated by supernova ejecta shocks interacting with the surrounding progenitor winds. Due to high velocity of the ejecta as compared to that of the wind, supernova studies at radio frequencies are one of the best means to study the final evolutionary stages of the progenitor star before the explosion. Radio observations in the optically thick phase of supernovae constrain the environment density, size, magnetic field and degree of homogeneity of the ejecta and the wind. However, less than 10% core collapse supernovae are radio bright, attributed mainly to the combination of efficient absorption of the radio radiation and sensitivity limitations of the current radio telescopes. With various upcoming refurbished and new state-of-the art radio telescopes, the detection rate of supernovae in radio bands is expected to increase significantly. In this talk, I will focus on our campaign and main results of the core collapse supernovae studied mainly with the Giant Metrewave Radio Telescope and the Very Large Array. I will also talk about how the upcoming Square Kilometer Array is expected to increase our understanding of radio supernovae many folds. (Host: Evan)