Abstract
In this chapter discusses supernovae of Type Ic (SN Ic), the most stripped of core-collapse supernovae. SN Ic show little evidence for either hydrogen or helium in their ejecta. Nebular spectra have features that are typical of core-collapse supernovae. SN Ic are of typical peak luminosity. The light-curve shapes of SN Ic are somewhat heterogeneous, being rather similar near peak but showing a range of late-time decline rates. Some, but not all, follow a locus of late-time exponential decline for hundreds of days in common with some other stripped-envelope supernovae. SN Ic often show explicit evidence for asymmetry. The environments of SN Ic in their host galaxies tend to be more metal-rich and to have higher star-formation rates than other core-collapse supernovae. Various arguments point to evolution in binary systems as the origin of SN Ic. Some SN Ic, denoted SN Ic-bl, display especially broad spectral lines, and some SN Ic-bl are observationally associated with cosmic gamma-ray bursts.
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