http://arxiv.org/abs/1705.00792
Core-collapse supernovae (SNe) of Types Ib and Ic arise from hydrogen-stripped stars, while the latter are also stripped of their helium. Both SN types have a similar temporal evolution, suggesting broadly similar progenitors. However, while some Ic SNe are associated with relativistic jets of gamma-ray bursts (GRBs), no GRB has yet been found in association with Type Ib SNe. Here we find that, even if GRB-like central engines operate in both SNe Ib and Ic, different properties of their envelopes may accommodate this potential tension. In particular, we focus on the case of a low-mass, extended envelope surrounding the progenitor star (as produced, for example, by strong mass losses prior to explosion). If the envelopes of Type Ib SNe are sufficiently massive ($M_{\rm ext}\sim(0.3-1)M_\odot$) and extended ($R_{\rm ext}\sim 10^{13}\text{ cm}$), we show that (i) GRB-like jets cannot break out of the star; (ii) the SN light curve is compatible with current observations. Different envelope properties of Type Ib SNe with respect to (at least some) Type Ic SNe may be connected to the presence of a helium layer surrounding the star.
E. Sobacchi, J. Granot and O. Bromberg
Wed, 3 May 17
4/60
Comments: 5 pages, 2 figures, submitted to MNRAS
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