Abstract
In this chapter addresses a kind of supernova that we have elected to discuss separately from supernovae of Type IIP (SN IIP; Chapter “Type IIP Supernovae”). Type IIL (SN IIL) supernovae are hydrogen-rich events characterized by their photometric behavior. Their light curves undergo an extended linear (on a log scale, so exponential in time) decline. The most clear-cut cases show little evidence for the distinct plateaus that characterize SN IIP. SN IIL roughly behave like the steep declines of SN IIP between the plateau and the late-time tail. Some SN IIL, however, do show abbreviated plateaus. To add to the ambivalence, many SN IIL have narrow emission lines that are similar to those that are the hallmark of Type IIn (SN IIn; Chapter “Type IIn Supernovae”). Rather than constituting a distinct class, SN IIL may represent a transition from SN IIP to SN IIn depending on the extent and/or timing of presupernova progenitor mass loss.
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