Binary star progenitors of long gamma-ray bursts

M. Cantiello, S.C. Yoon, N. Langer, M. Livio

Research output: Contribution to journalArticleAcademicpeer-review


Context.The collapsar model for long gamma-ray bursts requires a rapidly rotating Wolf-Rayet star as progenitor. Aims.We test the idea of producing rapidly rotating Wolf-Rayet stars in massive close binaries through mass accretion and consecutive quasi-chemically homogeneous evolution - the latter had previously been shown to provide collapsars below a certain metallicity threshold. Conclusions.The binary channel presented here does not, as such, provide a new physical model for collapsar production, as the resulting stellar models are almost identical to quasi-chemically homogeneously evolving rapidly rotating single stars. However, it may provide a means for massive stars to obtain the required high rotation rates. Moreover, it suggests that a possibly large fraction of long gamma-ray bursts occurs in runaway stars.
Original languageUndefined/Unknown
Pages (from-to)L29-L33
Number of pages4
JournalAstronomy and astrophysics letters
Issue number2
Publication statusPublished - 2007

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