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arXiv 0811.2129astro-ph
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潮汐引起的热核超新星

Tidally-induced thermonuclear Supernovae

S. Rosswog, E. Ramirez-Ruiz, W. R. Hix

备注：
8 pages, 2 figures, EuroWD08
发表信息：
J.Phys.Conf.Ser.172:012036,2009
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摘要：

我们讨论了中等质量黑洞对白矮星潮汐破坏的三维模拟结果，因为它们可能存在于球状星团或矮星系的核心。我们的模拟遵循自洽的流体动力学和核的演变，从最初的抛物线轨道上的中断，建立一个吸积盘周围的黑洞。在足够强的碰撞（近心点距离小于潮汐半径的1/3）下，潮汐压缩被激波逆转，最终导致热核爆炸。这些爆炸并不局限于祖质量接近的卡拉塞卡极限，我们发现爆炸的例子在整个白矮星质量范围。然而，黑洞的质量是有限制的：质量大于$2\times 10^5$ M $_\odot$的黑洞在它们的潮汐力超过恒星的自引力之前，会吞下一颗典型的0.6 M $_\odot$矮星。因此，这种机制是中等质量的黑洞的特征。仍然与黑洞结合的物质进入吸积盘，产生接近$L_{\rm Edd} \simeq 10^{41} {\rm erg/s} M_{\rm bh}/1000 M$ _ \odot $）爱丁顿极限的X射线耀斑，通常持续几个月。一颗奇特的热核超新星与一个X射线耀斑的结合，从而吹响了这种中等质量黑洞存在的口哨。下一代宽视场天基仪器应当能够探测到这类事件。

英文摘要：

We discuss the results of 3D simulations of tidal disruptions of white dwarfs by moderate-mass black holes as they may exist in the cores of globular clusters or dwarf galaxies. Our simulations follow self-consistently the hydrodynamic and nuclear evolution from the initial parabolic orbit over the disruption to the build-up of an accretion disk around the black hole. For strong enough encounters (pericentre distances smaller than about 1/3 of the tidal radius) the tidal compression is reversed by a shock and finally results in a thermonuclear explosion. These explosions are not restricted to progenitor masses close to the Chandrasekhar limit, we find exploding examples throughout the whole white dwarf mass range. There is, however, a restriction on the masses of the involved black holes: black holes more massive than $2\times 10^5$ M$_\odot$ swallow a typical 0.6 M$_\odot$ dwarf before their tidal forces can overwhelm the star's self-gravity. Therefore, this mechanism is characteristic for black holes of moderate masses. The material that remains bound to the black hole settles into an accretion disk and produces an X-ray flare close to the Eddington limit of $L_{\rm Edd} \simeq 10^{41} {\rm erg/s} M_{\rm bh}/1000 M$_\odot$), typically lasting for a few months. The combination of a peculiar thermonuclear supernova together with an X-ray flare thus whistle-blows the existence of such moderate-mass black holes. The next generation of wide field space-based instruments should be able to detect such events.

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