What differentiates the outcome of a Direct Collapse scenario from a standard Supernova event regarding the visible explosion?

Answer

The entire stellar envelope falls directly onto the core, resulting in no massive explosion.

While the supernova path involves the core collapsing and then violently rebounding the outer layers in a spectacular explosion, the Direct Collapse scenario bypasses this rebound entirely. This occurs either due to the star being exceptionally massive or specific configurations in the progenitor system. Instead of generating a visible shockwave, the outer layers simply continue falling inward onto the already collapsing core, crushing it immediately into a black hole without the characteristic bright flash associated with a typical supernova explosion. This leaves behind a different observational signature.

What differentiates the outcome of a Direct Collapse scenario from a standard Supernova event regarding the visible explosion?
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