Ultraviolet spectroscopy of the supernova Ia hypervelocity runaway white dwarf J0927-6335
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910597117902848 |
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| author | Werner, Klaus El-Badry, Kareem Gänsicke, Boris T. Shen, Ken J. |
| author_facet | Werner, Klaus El-Badry, Kareem Gänsicke, Boris T. Shen, Ken J. |
| contents | The hot white dwarf (WD) J0927-6335 (Gaia DR3 5250394728194220800, effective temperature T$_{\rm eff}$ = 60,000 K, surface gravity log g = 7) was detected as the fastest known Galactic hypervelocity star with a space velocity of $\approx$2800 km s$^{-1}$ and an atmosphere dominated by carbon and oxygen. It is thought to be the surviving WD donor predicted by the "dynamically driven double-degenerate double-detonation" (D$^6$) type Ia supernova formation model. We analysed an ultraviolet spectrum of J0927-6335 obtained recently with the Hubble Space Telescope and found very high abundances of iron and nickel. This could originate in the pollution of the remnant by the SN Ia explosion but it is uncertain to what extent atomic diffusion altered the chemical composition of the accreted material. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_08397 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultraviolet spectroscopy of the supernova Ia hypervelocity runaway white dwarf J0927-6335 Werner, Klaus El-Badry, Kareem Gänsicke, Boris T. Shen, Ken J. Solar and Stellar Astrophysics High Energy Astrophysical Phenomena The hot white dwarf (WD) J0927-6335 (Gaia DR3 5250394728194220800, effective temperature T$_{\rm eff}$ = 60,000 K, surface gravity log g = 7) was detected as the fastest known Galactic hypervelocity star with a space velocity of $\approx$2800 km s$^{-1}$ and an atmosphere dominated by carbon and oxygen. It is thought to be the surviving WD donor predicted by the "dynamically driven double-degenerate double-detonation" (D$^6$) type Ia supernova formation model. We analysed an ultraviolet spectrum of J0927-6335 obtained recently with the Hubble Space Telescope and found very high abundances of iron and nickel. This could originate in the pollution of the remnant by the SN Ia explosion but it is uncertain to what extent atomic diffusion altered the chemical composition of the accreted material. |
| title | Ultraviolet spectroscopy of the supernova Ia hypervelocity runaway white dwarf J0927-6335 |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2408.08397 |