Projects per year
Abstract
We explore the final fates of massive intermediate-mass stars by computing detailed stellar models from the zero-age main sequence until near the end of the thermally pulsing phase. These super-asymptotic giant branch (super-AGB) and massive AGB star models are in the mass range between 5.0 and 10.0 M⊙ for metallicities spanning the range Z = 0.02–0.0001. We probe the mass limits Mup, Mn and Mmass, the minimum masses for the onset of carbon burning, the formation of a neutron star and the iron core-collapse supernovae, respectively, to constrain the white dwarf/electron-capture supernova (EC-SN) boundary. We provide a theoretical initial-to-final mass relation for the massive and ultra-massive white dwarfs and specify the mass range for the occurrence of hybrid CO(Ne) white dwarfs. We predict EC-SN rates for lower metallicities which are significantly lower than existing values from parametric studies in the literature. We conclude that the EC-SN channel (for single stars and with the critical assumption being the choice of mass-loss rate) is very narrow in initial mass, at most ≈0.2 M⊙. This implies that between ∼2 and 5 per cent of all gravitational collapse supernova are EC-SNe in the metallicity range Z = 0.02–0.0001. With our choice for mass-loss prescription and computed core growth rates, we find, within our metallicity range, that CO cores cannot grow sufficiently massive to undergo a Type 1.5 SN explosion.
Original language | English |
---|---|
Pages (from-to) | 2599-2612 |
Number of pages | 14 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 446 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- stars:AGBand post-AGB
- stars: evolution
- supernovae: general
- white dwarfs
Projects
- 3 Finished
-
Advancing and Applying Stellar Nucleosynthesis: Using Stars to Probe Galaxies
Lattanzio, J., Arnett, D. W. & de Silva, G. M.
Australian Research Council (ARC), Monash University
3/01/12 → 1/07/15
Project: Research
-
The Next Generation of Stellar Models: Incorporating the Results of Multidimensional Hydrodynamics
Lattanzio, J., Wood, P. & Arnett, D. W.
Australian Research Council (ARC), Australian National University (ANU), University of Arizona
4/01/10 → 31/12/13
Project: Research
-
Super-AGB Stars: the Missing Link?
Lattanzio, J., Gil Pons, M. & Siess, L.
Australian Research Council (ARC), Monash University
2/01/08 → 30/06/11
Project: Research