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Examples
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Earlier, scientists suspected that RCW 86 formed from a so-called core-collapse supernova, which occurs when a star's core reaches a tipping point mass and implodes.
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One important question the scientists hope to answer is just what causes the difference between the "ordinary" and the "engine-driven" core-collapse supernovae.
Supernova or GRB? Radio Observations Allow Astronomers to Find Unusual Object | Universe Today 2010
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Do some core-collapse supernovae result in black holes and relativistic jets?
GRB Central Engines Observed in Nearby Supernovae? | Universe Today 2010
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Unlike typical core-collapse supernovae, the stars that produce long gamma-ray bursts possess a "central engine" – likely a nascent black hole – that drives particle jets clocked at more than 99 percent the speed of light short GRBs are likely produced by the collision/merger of two neutron stars, or a neutron star and a stellar mass black hole.
GRB Central Engines Observed in Nearby Supernovae? | Universe Today 2010
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For the past decade or so, astronomers have identified one particular type of such a "core-collapse supernova" as the cause of one kind of gamma-ray burst.
Supernova or GRB? Radio Observations Allow Astronomers to Find Unusual Object | Universe Today 2010
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Out of the 17 supernova remnants sampled, ten were classified as the core-collapse variety, while the remaining seven of them were classified as Type Ia.
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This one was considered a Type Ia based on its chemical abundances, but Lopez finds it has the asymmetry of a core-collapse remnant.
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On the other hand, the remnants tied to the "core-collapse" supernova explosions were distinctly more asymmetric.
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However, some core-collapse supernovae are up to 100 times less energetic and luminous than usual.
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Models of core-collapse supernovas must include a way to reproduce the asymmetries measured in this work and models of Type Ia supernovas must produce the symmetric, circular remnants that have been observed.
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