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arXiv 2408.08397astro-ph.SRastro-ph.HE
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Ia型超新星高速逃逸白矮星J0927-6335的紫外光谱研究

Ultraviolet spectroscopy of the supernova Ia hypervelocity runaway white dwarf J0927-6335

Klaus Werner, Kareem El-Badry, Boris T. Gänsicke, Ken J. Shen

AI总结:

利用哈勃紫外光谱分析疑似D^6模型幸存供体的超高速白矮星J0927-6335,发现高铁镍丰度,支持Ia型超新星爆炸污染成因。

摘要:

炽热白矮星(WD)J0927-6335(Gaia DR3 5250394728194220800,有效温度T_eff=60,000 K,表面重力log g=7)被发现是已知最快的银河系超高速星,其空间速度约为2800 km s^-1,大气以碳和氧为主。它被认为是“动力学驱动双简并双爆轰”(D^6)Ia型超新星形成模型所预言的幸存白矮星供体。我们分析了近期由哈勃空间望远镜获取的J0927-6335紫外光谱,发现了极高丰度的铁和镍。这可能源于SN Ia爆炸对遗迹的污染,但原子扩散在多大程度上改变了吸积物质的化学成分尚不确定。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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