Caltech Core-Collapse Project (CCCP) observations of type IIn supernovae: typical properties and implications for their progenitor stars

Understand

Type IIn Supernovae (SNe IIn) are rare events, constituting only a few percent of all core-collapse SNe, and the current sample of well observed SNe IIn is small.

• Here, we study the four SNe IIn observed by the Caltech Core-Collapse Project (CCCP).
• The CCCP SN sample is unbiased to the extent that object selection was not influenced by target SN properties.
• Therefore, these events are representative of the observed population of SNe IIn.