EP260321a is the faintest observed shock breakout tied to a broad-lined Type Ic supernova, interpreted as a choked weak outflow from a stripped star.
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Mixing electromagnetic radiation with dark radiation between BBN and recombination dilutes the baryon-to-entropy ratio, tightening the allowed total extra radiation to at most ~25% more than dark-radiation-only scenarios.
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EP260321a/SN 2026gzf: The Faintest Shock Breakout Associated with a Broad-Lined Supernova
EP260321a is the faintest observed shock breakout tied to a broad-lined Type Ic supernova, interpreted as a choked weak outflow from a stripped star.
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Constraints on the Injection of Radiation in the Early Universe
Mixing electromagnetic radiation with dark radiation between BBN and recombination dilutes the baryon-to-entropy ratio, tightening the allowed total extra radiation to at most ~25% more than dark-radiation-only scenarios.