Type Ia supernovae with and without blueshifted narrow Na i D lines โ how different is their structure?
Type Ia supernovae with and without blueshifted narrow Na i D lines โ how different is their structure?
In studies on intermediate- and high-resolution spectra of Type Ia supernovae (SNe Ia), some objects exhibit narrow Na i D absorptions often blueshifted with respect to the rest wavelength within the host galaxy. The absence of these in other SNe Ia may reflect that the explosions have different progenitors: blueshifted โฆ