This week I discuss types of supernovae, specifically relating to the scenario where “Hydrogen lines are prominent in Type II supernovae but absent in Type Ia. Type Ia supernovae decline gradually for more than a year, whereas Type II supernovae alternate between periods of steep and gradual declines in brightness. Type II light curves therefore have a step-like appearance. Explain!”
The question I really wanted to ask is ‘What happened to Type I or Ib?’ and the answer to that question was easily found in this chart:
