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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1603.01281 (astro-ph)
[Submitted on 3 Mar 2016 (v1) , last revised 10 Nov 2016 (this version, v2)]

Title: Urca cooling pairs in the neutron star ocean and their effect on superbursts

Title: 中子星海洋中的Urca冷却对和及其对超爆发的影响

Authors:Alex Deibel, Zach Meisel, Hendrik Schatz, Edward F. Brown, Andrew Cumming
Abstract: An accretion outburst onto a neutron star deposits hydrogen-rich and/or helium-rich material into the neutron star's envelope. Thermonuclear burning of accreted material robustly produces Urca pairs\textrm{---}pairs of nuclei that undergo cycles of $e^-$-capture and $\beta ^-$-decay. The strong $T^5$ dependence of the Urca cooling neutrino luminosity means that Urca pairs in the neutron star interior potentially remove heat from accretion-driven nuclear reactions. In this study, we identify Urca pairs in the neutron star's ocean \textrm{---} a plasma of ions and electrons overlaying the neutron star crust \textrm{---} and demonstrate that Urca cooling occurs at all depths in the ocean. We find that Urca pairs in the ocean and crust lower the ocean's steady-state temperature during an accretion outburst and that unstable carbon ignition, which is thought to trigger superbursts, occurs deeper than it would otherwise. Cooling superburst light curves, however, are only marginally impacted by cooling from Urca pairs because the superburst peak radiative luminosity $L_{\rm peak}$ is always much greater than the Urca pair neutrino luminosity $L_{\nu}$ in the hot post-superburst ocean.
Abstract: 中子星吸积爆发将富含氢和/或氦的物质沉积到中子星包层中。 吸积物质的热核燃烧会产生稳定的Urca对\textrm{---}对核素,这些核素经历$e^-$-捕获和$\beta ^-$-衰变的循环。 Urca冷却中微子光度的强$T^5$依赖性意味着中子星内部的Urca对有可能从吸积驱动的核反应中带走热量。 在本研究中,我们识别中子星海洋中的Urca对\textrm{---}一种覆盖在中子星地壳之上的离子和电子等离子体\textrm{---},并证明Urca冷却在海洋的所有深度都发生。 我们发现,在吸积爆发期间,海洋中的Urca对和地壳会降低海洋的稳态温度,并且被认为会触发超爆发的不稳定碳点火发生在比原本更深的位置。 冷却超爆发光曲线,然而,仅受到Urca对冷却的轻微影响,因为超爆发峰值辐射光度$L_{\rm peak}$始终远大于热后超爆发海洋中的Urca对中微子光度$L_{\nu}$。
Comments: 9 pages, 6 Figures, accepted to the Astrophysical Journal
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1603.01281 [astro-ph.HE]
  (or arXiv:1603.01281v2 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1603.01281
arXiv-issued DOI via DataCite
Related DOI: https://doi.org/10.3847/0004-637X/831/1/13
DOI(s) linking to related resources

Submission history

From: Alex Deibel [view email]
[v1] Thu, 3 Mar 2016 21:04:50 UTC (109 KB)
[v2] Thu, 10 Nov 2016 23:36:27 UTC (116 KB)
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