Rare Events: SLSNe are relatively rare compared to typical supernovae. The rate of SLSNe occurrence is estimated to be several orders of magnitude lower than that of regular supernovae.
Different Types: There are different types of SLSNe, each with its own characteristics and frequency. Some of the main types include:
- Pair-instability supernovae (PISNe): These are associated with the explosions of massive stars with very high initial masses, exceeding 100 times the mass of the Sun. PISNe are thought to be responsible for some of the most luminous and energetic SLSNe events. They are relatively rare, with an estimated rate of occurrence of about one PISN every 100 million years in a galaxy the size of the Milky Way.
- Luminous blue variable (LBV) supernovae: These are associated with the explosions of massive, unstable stars that have undergone significant mass loss and variability in their luminosity. LBV supernovae are also relatively rare, with an estimated rate of occurrence of a few per hundred million years in the Milky Way galaxy.
- Type IIn SLSNe: These are characterized by strong interaction between the ejecta from the supernova and the surrounding circumstellar material, leading to enhanced brightness and distinctive spectral features. Type IIn SLSNe are relatively more common compared to PISNe and LBV supernovae, with an estimated rate of occurrence of a few per million years in the Milky Way.
It's important to note that these estimates are based on observations and models and may vary depending on the specific criteria and selection effects used in identifying SLSNe. Ongoing surveys and research continue to improve our understanding of the frequency and properties of these exceptional events in the universe.
