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AST201H1 Full Course Notes
Type 1 supernovae (white dwarf supernovae) tend to dim faster (first few weeks) and the luminosities decrease more gradually. Hydrogen isn"t present in the spectral lines of white dwarf supernovae while type 2 should have several hydrogen spectral lines since it high mass stars have more hydrogen in its outer layers. Type 2 is also most often observed in elliptical galaxies while type 1 is most often observed in spiral galaxies. Type 1 supernovae usually don"t leave behind a remnant while type 2 supernovae usually leaves either nothing, a neutron star or a black hole. Supernova type 1: white dwarf binary star system- engulfing chemicals/gas released by binary star and since the mass > 1. 4msun it can"t be supported by the electron degeneracy pressure. Supernova type 2: core collapse of a high-mass star-once iron is reached in the core, no pressure so it contracts and cools (gravity wins over pressure), overcomes electron degeneracy pressure (electron capture e+p neutrons and neutrinos).