What causes the characteristic plateau phase observed in a Type II-P supernova light curve?
Answer
Recombination of vast amounts of hydrogen gas in the envelope releasing energy.
The plateau in a Type II-P light curve is caused by the energy released as the large hydrogen envelope recombines with electrons, keeping the surface brightness relatively constant for weeks or months.
Related Questions
What fundamental difference defines a supernova compared to a nova?What is the primary method used to name and classify a specific supernova according to modern standards?What spectral feature unambiguously defines a Type I supernova?What critical mass threshold triggers the runaway fusion in a Type Ia supernova?Which spectral signature characterizes a Type II supernova?What type of star generally undergoes a core-collapse supernova (Types II, Ib, Ic)?What is the expected stellar remnant following a Type Ia supernova explosion?How do Type Ib and Type Ic supernovae differ regarding their spectral lines?What does the 'A' in the historical designation SN 1987A primarily signify?What causes the characteristic plateau phase observed in a Type II-P supernova light curve?