Can stellar mixing explain the lack of type ib supernovae in long-duration gamma-ray bursts?

Lucille H. Frey, Chris L. Fryer, Patrick Young

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


The discovery of supernovae associated with long-duration gamma-ray burst observations is primary evidence that the progenitors of these outbursts are massive stars. One of the principle mysteries in understanding these progenitors has been the fact that all of these gamma-ray-burst-associated supernovae are Type Ic supernovae with no evidence of helium in the stellar atmosphere. Many studies have focused on whether or not this helium is simply hidden from spectral analyses. In this Letter, we show results from recent stellar models using new convection algorithms based on our current understanding of stellar mixing. We demonstrate that enhanced convection may lead to severe depletion of stellar helium layers, suggesting that the helium is not observed simply because it is not in the star. We also present light curves and spectra of these compact helium-depleted stars compared to models with more conventional helium layers.

Original languageEnglish (US)
Article numberL7
JournalAstrophysical Journal Letters
Issue number1
StatePublished - Aug 10 2013


  • stars: neutron
  • supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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