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SESK: Stuff Everyone Should Know · sesk.info/astro-type-ia-supernova

What kind of star explodes in a type Ia supernova?

A white dwarf in a binary, destabilized by transferred matter or a white-dwarf merger.

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  1. A massive star's iron core
  2. A white dwarf in a binary system ✔
  3. An isolated neutron star

Why: A type Ia supernova destroys a white dwarf in a binary. It may be destabilized by matter from a companion or by merging with another white dwarf. Iron-core collapse produces other supernova types.

Huh, didn't know that: Type Ia supernovae show strong silicon lines that core collapse supernovae lack.

The dad joke
A white dwarf kept snacking on its neighbor. Then it really blew up.
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References

Answer: A white dwarf in a binary system. A type Ia supernova destroys a white dwarf in a binary. It may be destabilized by matter from a companion or by merging with another white dwarf. Iron-core collapse produces other supernova types.

  1. Astronomy 2e, 23.5 The Evolution of Binary Star Systems openstax.org/books/astronomy-2e/pages/23-5-the-evolution-of-binary-star-systems
    Eventually, the white dwarf acquires so much mass that it is pushed over the Chandrasekhar limit and becomes a type Ia supernova.
    Checked 2026-10-10.
  2. NASA Science, Type Ia Supernovae science.nasa.gov/mission/roman-space-telescope/type-ia-supernovae
    These blasts are caused by the total destruction of a white dwarf star
    Checked 2026-10-10.

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