Speaker
Prof.
Debades Bandyopadhyay
(Saha Institute of Nuclear Physics)
Description
Supernova explosions are spectacular astronomical events. At the same time,
the understanding of the final journey of a massive star after its fuel has
been exhausted is a challenging problem. The outcome of it is a core collapse
supernova and the residue may take the form of either a neutron star
or a black hole. The core collapse supernova explosion mechanism is being investigated
over the last five decades. Still, the detailed theory of a successful
supernova explosion is beyond our reach. In most core collapse supernova
simulations, the shock stalls after traversing a few hundred kilometers. It is
not yet understood whether dimension of the problem or microphysics such as
equation of state (EoS) of dense matter and neutrino physics is responsible
for a successful core collapse supernova explosion. The shock revival by
neutrino heating, after hundreds of milliseconds, was investigated in
understanding a successful core collapse supernova explosion. On the other
hand, novel phases of dense matter such as hyperon, quark or Bose condensates
of pions and kaons might be formed just after the bounce of the Fe core.
Here I discuss our newly constructed $\Lambda$ hyperon EoS
for core-collapse supernova simulations and neutron star mergers. This is the
first supernova EoS involving $\Lambda$ hyperons which is compatible with the
recently measured 2 M$_{\odot}$ neutron star. I describe the role of
strange baryon matter on supernova simulations in GR1D code using our $\Lambda$
hyperon EoS as well as neutrino signal. In this context, I also discuss the
metastability of the protoneutron star and its connection to the fate of
SN1987A.
Primary author
Prof.
Debades Bandyopadhyay
(Saha Institute of Nuclear Physics)
Co-authors
Mr
Prasanta Char
(Saha Institute of Nuclear Physics)
Dr
Sarmistha Banik
(Birla Institute of Technology and Science (BITS) Pilani, Hyderabad)
