Tycho Brahe’s 1572 supernova as a standard type Ia as revealed by its light-echo spectrum

@article{Krause2008TychoB1,
  title={Tycho Brahe’s 1572 supernova as a standard type Ia as revealed by its light-echo spectrum},
  author={O. Krause and Masaomi Tanaka and T. Usuda and T. Hattori and M. Goto and S. Birkmann and K. Nomoto},
  journal={Nature},
  year={2008},
  volume={456},
  pages={617-619}
}
Type Ia supernovae are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of the accelerated expansion of the Universe. Among the most important unsolved questions about supernovae are how the explosion actually proceeds and whether accretion occurs from a companion or by the merging of two white dwarfs. Tycho Brahe’s supernova of 1572 (SN 1572) is thought to be one of the best… Expand
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