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arXiv 2208.03347astro-ph.HE
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用X射线超级暴中碳点火深度的推断约束吸积中子星壳层浅层加热

Constraining Accreted Neutron Star Crust Shallow Heating with the Inferred Depth of Carbon Ignition in X-ray Superbursts

Zach Meisel

AI总结:

本文提出利用X射线超级暴中碳点火深度来约束吸积中子星壳层浅层加热的强度和深度,并分析了其对壳层成分、碳聚变速率、吸积率及爆发持续时间的敏感性。

摘要:

已有证据表明,在吸积中子星壳层的浅层深度存在一个尚未被解释的热源。然而,这一热源的性质尚不清楚。我证明,X射线超级暴中推断出的碳点火深度可以作为浅层加热强度和深度的额外约束。推断出的浅层加热性质对假定的壳层成分和碳聚变反应速率相对不敏感。对于低吸积率,只要吸积持续的时间足够长,足以将海洋替换到超级暴点火深度,结果对吸积爆发持续时间的依赖性较弱。对于爱丁顿吸积率,结果显示对爆发持续时间有更强的依赖性。与早期工作一致,研究表明urca冷却不会影响计算出的超级暴点火深度,除非加热源和冷却源在深度上存在某种邻近性。

英文摘要:

Evidence has accumulated for an as-yet unaccounted for source of heat located at shallow depths within the accreted neutron star crust. However, the nature of this heat source is unknown. I demonstrate that the inferred depth of carbon ignition in X-ray superbursts can be used as an additional constraint for the magnitude and depth of shallow heating. The inferred shallow heating properties are relatively insensitive to the assumed crust composition and carbon fusion reaction rate. For low accretion rates, the results are weakly dependent on the duration of the accretion outburst, so long as accretion has ensued for enough time to replace the ocean down to the superburst ignition depth. For accretion rates at the Eddington rate, results show a stronger dependence on the outburst duration. Consistent with earlier work, it is shown that urca cooling does not impact the calculated superburst ignition depth unless there is some proximity in depth between the heating and cooling sources.

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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