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SUMMARY:Francesco Gabrielli (Uppsala University): The impact of stellar bi
 naries and star cluster dynamics on the emergence of pair-instability supe
 rnovae
DTSTART:20260611T120000Z
DTEND:20260611T130000Z
DTSTAMP:20260720T012900Z
UID:indico-event-2116@indico.uu.se
DESCRIPTION:Title: The impact of stellar binaries and star cluster dynamic
 s on the emergence of pair-instability supernovae Speaker: Francesco Gabr
 ielli Affiliation: Uppsala University Room: Å101130 Time: 14:00-15:00
  Abstract: Pair-instability supernovae (PISNe) are an elusive class of t
 ransients representing the final fate of low-metallicity\, very-massive st
 ars. Despite their extreme expected luminosities - up to one hundred times
  those of typical core-collapse supernovae - they have never been confiden
 tly observed. Solving this long-standing puzzle would have key implication
 s for several astrophysical topics\, including galaxy chemical enrichment\
 , the interpretation of gravitational waves from binary black hole mergers
 \, and the nature of high-redshift sources seen by JWST. However\, studies
  of PISNe have largely focused on single-stellar progenitors\, despite the
  fact that most very-massive stars are expected to reside in binaries or e
 ven higher-order multiple systems. Moreover\, PISNe can arise in a wide va
 riety of galactic environments\, from low-density regions to dense star cl
 usters.In this seminar\, I will present an in-depth study on the impact of
  binary evolution and dynamical interactions on the emergence of PISNe. We
  employ the population synthesis code SEVN\, equipped with PARSEC stellar 
 tracks\, to simulate the evolution of binary PISN progenitors\, and model 
 the effect of external perturbers on their orbits in globular\, young\, an
 d nuclear star clusters. Combining these results with an up-to-date\, meta
 llicity-dependent star formation history\, we provide a comprehensive fram
 ework for the PISN rate as a function of redshift. I will describe how the
  PISN rate is shaped by variations in formation channels\, cluster propert
 ies\, and the upper limit of the stellar initial mass function. In additio
 n\, I will identify the most-efficient galactic environments for producing
  PISNe\, and showcase the potential of future PISN observations to resolve
  major uncertainties in stellar and galaxy evolution models - including st
 ellar-wind mass-loss prescriptions for very-massive stars\, and the galaxy
  metallicity distribution across cosmic time. \n\nhttps://indico.uu.se/ev
 ent/2116/
LOCATION:Å101130
URL:https://indico.uu.se/event/2116/
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