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arXiv 2004.05514astro-ph.HE
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GRB 111209 A/ SN 2011 kl:超大质量磁星的r模振荡坍缩和新生黑洞的回吸积

GRB 111209A/SN 2011kl: Collapse of a supramassive magnetar with r-mode oscillation and fall-back accretion onto a newborn black hole

Jie Lin, Rui-Jing Lu, Da-Bin Lin, Xiang-Gao Wang

摘要:

超长持续时间的伽马射线暴GRB 111209 A被发现与一颗非常明亮的超新星(SNe)SN 2011 kl有关。GRB 111209 A/SN 2011 kl的物理机制在文献中已经得到了广泛的研究,但尚未形成定论。通过详细研究GRB 111209 A的X射线光变曲线的特征,结合SN 2011 kl的时间和光谱特征,我们认为,一个短寿命的超大质量磁星可以负责最初的浅X射线发射。当磁星坍缩成黑洞(BH)时,自旋能从黑洞中被电磁抽取,导致X射线通量急剧下降。一小部分包层物质回落并激活新生BH上的吸积,这在晚些时候产生X射线再亮撞击。在这个过程中,一个离心驱动的富含重子的准各向同性Blandford \& Payne流出物从复苏的吸积盘沉积其动能的SN喷出物,这给发光的SN 2011 kl提供动力。最后,我们根据观测结果对磁星的物理参数进行了限制。

英文摘要:

Ultra-long-duration gamma-ray burst GRB 111209A was found to be associated with a very luminous supernovae (SNe) SN 2011kl. The physics of GRB 111209A/SN 2011kl has been extensively studied in the literures, but does not settle down yet. By investigating in detail the characteristics of the X-ray light curve of GRB 111209A, coupled with the temporal and spectral features observed in SN 2011kl, we argue that a short-living supramassive magnetar can be responsible for the initial shallow X-ray emission. Then the electromagnetic extraction of spin energy from a black hole results in the steeply declining X-ray flux when the magnetar collapses into a black hole (BH). A fraction of the envelope materials falls back and activates the accretion onto the newborn BH, which produces the X-ray rebrightening bump at late times. During this process, a centrifugally driven baryon-rich quasi-isotropic Blandford \& Payne outflow from the revived accretion disk deposits its kinetic energy on the SN ejecta, which powers luminous SN 2011kl. Finally, we place a limitation on the magnetar's physical parameters based on the observations.

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