Detection of Circumstellar Material in a Normal Type Ia Supernova
Detection of Circumstellar Material in a Normal Type Ia Supernova
Type Ia supernovae are important cosmological distance indicators. Each of these bright supernovae supposedly results from the thermonuclear explosion of a white dwarf star that, after accreting material from a companion star, exceeds some mass limit, but the true nature of the progenitor star system remains controversial. Here we report …