Optical

Sub-Chandrasekhar progenitors favoured for Type Ia supernovae: evidence from late-time spectroscopy

A non-local-thermodynamic-equilibrium level population model of the first and second ionization stages of iron, nickel, and cobalt is used to fit a sample of XShooter optical + near-infrared (NIR) spectra of Type Ia supernovae (SNe Ia). From the …