Super- and sub-Chandrasekhar limiting mass white dwarfs: Progenitors of peculiar type Ia supernovae and multiple astrophysical implications

There are several over- and under-luminous peculiar type Ia supernovae, implying their respective progenitors deviating significantly from the Chandrasekhar-limit. We have been attempting to uncover this issue since last 5 years or so, by introducing the possibility of super- and sub-Chandrasekhar limiting mass of white dwarfs. They could be due to the presence of strong magnetic fields in them and/or effects of modified gravity in their central high density region. I will touch upon how we have been establishing them one by one starting from simplistic to rigorous models. I will also show that there are several other important astrophysical implications of these "non-Chandrasekhar" white dwarfs,related to SGRs/AXPs, white dwarf pulsars, gravitational waves etc.

Speaker: 
Banibrata Mukhopadhyay
Speaker Introduction: 

Prof. Banibrata Mukhopadhyay is working as a faculty member in the Indian Institute of Science, Bangalore (one of the highest ranked Institutes in India which is more than 100 years old) since 2006, currently as an Associate Professor. Prior to that he was in the Harvard University as a Postdoctoral Fellow in its Theoretical Astrophysics Group. He did his Ph.D. from S. N. Bose National Centre for Basic Sciences, Kolkata, India. Mukhopadhyay has a variety of research interest including physics of compact objects, astrophysical fluids, nuclear astrophysics, field theory in curved spacetime and related cosmology. He has published more than 100 papers and graduated 5 Ph.D. students so far (and many more are graduating right now).

Place: 
KIAA-PKU Auditorium
Host: 
Bing Zhang
Time: 
Thursday, June 29, 2017 - 4:00pm to 5:00pm