Observationally, how can we tell the difference between a white-dwarf supernova and a massive-star supernova?
A) A massive-star supernova is brighter than a white-dwarf supernova.
B) A massive-star supernova happens only once, while a white-dwarf supernova can repeat periodically.
C) The spectrum of a massive-star supernova shows prominent hydrogen lines, while the spectrum of a white-dwarf supernova does not.
D) The light of a white-dwarf supernova fades steadily, while the light of a massive-star supernova continues to brighten for many weeks.
E) We cannot yet tell the difference between a massive-star supernova and a white-dwarf supernova.

Question

Quizplus · Accepted Answer

The spectrum of a massive-star supernova shows prominent hydrogen lines, while the spectrum of a white-dwarf supernova does not. This is the most reliable and definitive observational difference between the two types of supernovae, as it is based on the chemical makeup of the exploding star. Other differences, such as brightness or light curve shape, can be more variable and may be influenced by other factors. Choices A, B, and D are all incorrect as they do not accurately distinguish between the two types of supernovae. Choice E is incorrect as we can distinguish between the two types, at least in some cases, based on spectral analysis.

Observationally, How Can We Tell the Difference Between a White-Dwarf