Magnetically Driven Baryon Winds from Binary Neutron Star Merger Remnants and the Blue Kilonova of 2017 August

Magnetically Driven Baryon Winds from Binary Neutron Star Merger Remnants and the Blue Kilonova of 2017 August
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来自双中子星合并遗迹和 2017 年 8 月蓝色千新星的磁驱动重子风

DOI:
10.3847/2041-8213/abb240
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发表时间:
2020
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
J. Kalinani
J. Kalinani
中科院分区:
--
文献类型:
--
作者:
R. Ciolfi;J. Kalinani

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对引力波中探测到的与第一次双星中子星(BNS)合并相关的放射性能量千罗诺星的观测证明,这些事件是产生重r过程元素的理想地点。然而,这个千里诺瓦的早期(“蓝色”)和晚期(“红色”)成分的喷发物质的物理来源仍然存在争议。在这里,我们研究了早期/蓝色千里诺瓦起源于亚稳中子星残余物合并后发射的磁驱动重子风的可能性。利用磁化的BNS合并模拟,合并后的演化超过250ms,我们可以第一次跟踪完整的质量抛射过程,直到它最终的衰落。我们发现重子风携带着≃0.010-0.028 M⊙的非束缚物质,证明了蓝色基诺瓦的高质量是可以实现的。我们还发现了高达∼0.2c的膨胀速度,与观测估计的下限一致,并讨论了可能被忽略的可能影响,这些影响可能会进一步增加最终的抛射速度。总体而言,我们的结果表明,磁力驱动的重子风是解释蓝色千里诺瓦的一个可行通道。
The observation of a radioactively powered kilonova associated with the first binary neutron star (BNS) merger detected in gravitational waves proved that these events are ideal sites for the production of heavy r-process elements. However, the physical origin of the ejected material responsible for the early (“blue”) and late (“red”) components of this kilonova is still debated. Here, we investigate the possibility that the early/blue kilonova originated from the magnetically driven baryon wind launched after merger by the metastable neutron star remnant. Exploiting a magnetized BNS merger simulation with over 250 ms of post-merger evolution, we can follow for the first time the full mass-ejection process up to its final decline. We find that the baryon wind carries ≃0.010–0.028 M⊙ of unbound material, proving that the high mass estimated for the blue kilonova can be achieved. We also find expansion velocities of up to ∼0.2c, consistent with the lower end of the observational estimates, and we discuss possible effects neglected here that could further increase the final ejecta velocity. Overall, our results show that the magnetically driven baryon wind represents a viable channel to explain the blue kilonova.
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发表时间: 2017-11-02
期刊: NATURE
影响因子: 64.8
作者:
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发表时间: 2017-10
期刊: The Astrophysical Journal Letters
影响因子: --
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影响因子: --
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