Properties of Type Ibn Supernovae: Implications for the Progenitor Evolution and the Origin of a Population of Rapid Transients

Understand

Type Ibn Supernovae (SNe Ibn) show signatures of strong interaction between the SN ejecta and hydrogen-poor circumstellar matter (CSM).

• Deriving the ejecta and CSM properties of SNe Ibn provides a great opportunity to study the final evolution of massive stars.
• In the present work, we present a light curve (LC) model for the ejecta-CSM interaction, taking into account the processes in which the high-energy photons originally created at the forward and reverse shocks are converted to the observed emission in the optical.
• The model is applied to a sample of SNe Ibn and `SN Ibn' rapidly evolving transients.