A statistical analysis of circumstellar material in Type Ia supernovae
A statistical analysis of circumstellar material in Type Ia supernovae
A key tracer of the elusive progenitor systems of Type Ia supernovae (SNe Ia) is the detection of narrow blueshifted time-varying Na i D absorption lines, interpreted as evidence of circumstellar material surrounding the progenitor system. The origin of this material is controversial, but the simplest explanation is that it …