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arXiv 1606.02523astro-ph.HEgr-qc
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关于与超新星有关的伽马射线暴的诱导引力坍缩

On the induced gravitational collapse scenario of gamma-ray bursts associated with supernovae

L. Becerra, C. L. Bianco, C. L. Fryer, J. A. Rueda, R. Ruffini

摘要:

遵循Ib/c型超新星的伽马射线暴的诱导引力坍缩(IGC)范式,对伴有中子星的双星系统中的碳氧核爆炸进行了数值模拟.由于大量的中微子发射和吸积流中光子的捕获,超新星喷出物触发了NS上的\emph{hypercritical}吸积过程。结果表明,在NS表面附近温度为1- 10 ~MeV,因此电子-正电子湮灭为中微子成为导致吸积率$10^{-9}$ - $10^{-1}~M_\odot$ ~s $^{-1}$和中微子光度$10^{43}$ - $10^{52}$ ~erg~s $^{-1}$的主要冷却通道(轨道周期越短,吸积率越高).我们估计的最大轨道周期,$P_{\rm max}$,作为NS初始质量的函数,NS同伴可以达到超临界吸积的临界质量的引力坍缩导致黑洞(BH)的形成。然后,我们估计的吸积和轨道NS同伴到一个新的几何形状的超新星喷出物密度分布的影响。我们提出了一个$1.4\times 10^7$ ~粒子模拟的结果表明,NS诱导突出的不对称性,在喷出物的轨道平面周围的密度。我们详细阐述了与IGC过程的上述特征相关的可观测量。我们将这个框架应用于特定的伽玛暴:我们发现,X射线闪光(XRFs)和双星驱动的超新星(BdHNe)产生的双星与$P>P_{\rm max}$和$P < P_{\rm max}$,分别。我们详细分析了XRF 060218的案例。

英文摘要:

Following the induced gravitational collapse (IGC) paradigm of gamma-ray bursts (GRBs) associated with type Ib/c supernovae, we present numerical simulations of the explosion of a carbon-oxygen (CO) core in a binary system with a neutron-star (NS) companion. The supernova ejecta trigger a \emph{hypercritical} accretion process onto the NS thanks to a copious neutrino emission and the trapping of photons within the accretion flow. We show that temperatures 1--10~MeV develop near the NS surface, hence electron-positron annihilation into neutrinos becomes the main cooling channel leading to accretion rates $10^{-9}$--$10^{-1}~M_\odot$~s$^{-1}$ and neutrino luminosities $10^{43}$--$10^{52}$~erg~s$^{-1}$ (the shorter the orbital period the higher the accretion rate). We estimate the maximum orbital period, $P_{\rm max}$, as a function of the NS initial mass, up to which the NS companion can reach by hypercritical accretion the critical mass for gravitational collapse leading to black-hole (BH) formation. We then estimate the effects of the accreting and orbiting NS companion onto a novel geometry of the supernova ejecta density profile. We present the results of a $1.4\times 10^7$~particle simulation which show that the NS induces accentuated asymmetries in the ejecta density around the orbital plane. We elaborate on the observables associated with the above features of the IGC process. We apply this framework to specific GRBs: we find that X-ray flashes (XRFs) and binary-driven hypernovae (BdHNe) are produced in binaries with $P>P_{\rm max}$ and $P < P_{\rm max}$, respectively. We analyze in detail the case of XRF 060218.

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