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Researchers discovered a new supersoft X-ray source, likely a progenitor to Type Ia supernovae. This helium-accreting white dwarf system offers new insights into stellar explosions and the origin of elements like iron.

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Area of Science:

  • * Astrophysics
  • * Stellar Evolution
  • * Supernovae

Background:

  • * Type Ia supernovae are crucial cosmic distance markers and major iron sources.
  • * Current models of Type Ia supernova progenitors struggle to explain observational data.
  • * The existence of helium-accreting white dwarfs as progenitors has been theorized but not observed.

Purpose of the Study:

  • * To report the detection of a novel supersoft X-ray source.
  • * To investigate its potential as a progenitor for Type Ia supernovae.
  • * To explore new pathways for stellar explosions and element synthesis.

Main Methods:

  • * Observation of a supersoft X-ray source.
  • * Spectral analysis of its accretion disk.
  • * Interpretation of X-ray and optical emission.

Main Results:

  • * Detection of a supersoft X-ray source with a helium-dominated accretion disk.
  • * Evidence for stable helium burning on the white dwarf surface.
  • * The system's properties align with predictions for helium-accreting white dwarf progenitors.

Conclusions:

  • * The observed system provides the first direct evidence for helium-accreting white dwarfs as Type Ia supernova progenitors.
  • * This discovery supports extended pathways to Chandrasekhar-mass explosions.
  • * It may explain the origin of sub-energetic Type Iax supernovae.