Projects per year
Abstract
We study the impact of large-scale perturbations from convective shell burning on the corecollapse supernova explosion mechanism using 3D multigroup neutrino hydrodynamics simulations of an 18M⊙ progenitor. Seed asphericities in the O shell, obtained from a recent 3D model of O shell burning, help trigger a neutrino-driven explosion 330 ms after bounce whereas the shock is not revived in a model based on a spherically symmetric progenitor for at least another 300 ms. We tentatively infer a reduction of the critical luminosity for shock revival by ~20 per cent due to pre-collapse perturbations. This indicates that convective seed perturbations play an important role in the explosion mechanism in some progenitors. We follow the evolution of the 18M⊙ model into the explosion phase for more than 2 s and find that the cycle of accretion and mass ejection is still ongoing at this stage. With a preliminary value of 7.7 × 1050 erg for the diagnostic explosion energy, a baryonic neutron star mass of 1.85M⊙, a neutron star kick of ~600 km s-1 and a neutron star spin period of ~20 ms at the end of the simulation, the explosion and remnant properties are slightly atypical, but still lie comfortably within the observed distribution. Although more refined simulations and a larger survey of progenitors are still called for, this suggests that a solution to the problem of shock revival and explosion energies in the ballpark of observations is within reach for neutrino-driven explosions in 3D.
Original language | English |
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Pages (from-to) | 491–513 |
Number of pages | 23 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 472 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jan 2017 |
Keywords
- Convection
- Hydrodynamics
- Stars: massive
- Supernovae: general
- Turbulence
Projects
- 2 Finished
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Understanding the diversity of core-collapse supernovae
Mueller, B. (Primary Chief Investigator (PCI))
ARC - Australian Research Council, Monash University
30/06/17 → 18/09/24
Project: Research
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Cosmic explosions and the origin of the elements
Heger, A. (Primary Chief Investigator (PCI))
ARC - Australian Research Council
27/08/12 → 25/05/18
Project: Research