Astronomy and Astrophysics Seminars

Unveiling the Most Promising Formation Channel of FRBs

by Dr. Mohit Bhardwaj (Carnegie Mellon University)

Tuesday, December 5, 2023 from to (Asia/Kolkata)
at Hybrid ( AG66 ) Meeting ID: 996 7754 3165 Passcode: 951270
The origin of fast radio bursts (FRBs) remains an enduring enigma in contemporary astronomy, even after 17 years since their serendipitous discovery. A plethora of models has been proposed to shed light on their origins, encompassing both cataclysmic and non-cataclysmic formation channels. Within the non-cataclysmic category, the debate persists on whether the majority of FRBs are promptly formed after the death of their progenitor main sequence star or arise from recycled compact objects. In this talk, I leverage currently available observational data to address three pivotal questions: (1) What are the prospects of detecting FRBs originating from proposed cataclysmic channels? (2) Is there a single dominant FRB formation channel, governing these enigmatic bursts? And if a dominant channel does exist, can it explain the observed diversity among FRB host galaxies and their local environments? To address these probing questions, I use a sample of approximately two dozen local Universe FRBs (z < 0.1), many of which have been detected by the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) Project. Our analysis provides compelling evidence that core collapse supernovae are likely the dominant formation channel of FRB progenitors. Finally, this finding has noteworthy implications for multi-wavelength follow-up studies of FRBs, which I also discuss in this talk.