Calcium versus silicon ejecta velocities and decline rates in supernovae Ia: The role of high-velocity features

A. A. Hakobyan, M. H. Gevorgyan, A. G. Karapetyan +4

Photospheric and high-velocity features (PVFs and HVFs) of Si II $\lambda$6355 and Ca II IR3 lines in supernova Ia (SN Ia) spectra provide insights into ejecta structure, energetics, and…