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arXiv 1303.2691astro-ph.SR
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在WD + MS方案中Ia型超新星爆炸后幸存伴星的旋转

The rotation of surviving companion stars after type Ia supernova explosions in the WD+MS scenario

Zheng-Wei Liu, Ruediger Pakmor, Friedrich K. Roepke, Philipp Edelmann, Wolfgang Hillebrandt, Wolfgang E. Kerzendorf, Bo Wang, Zhan-Wen Han

摘要:

在Ia超新星的SD情况下,伴星在超新星爆炸后幸存下来,因此应该在超新星遗迹的中心附近可见,并可能显示出一些不寻常的特征。一个有前途的方法来测试SNe Ia的祖先模型是寻找SNRs中的伴侣。在这里,我们提出了3D流体动力学模拟的结果之间的相互作用的超新星Ia爆炸波和MS同伴考虑到其轨道运动和自旋。这项工作的主要目标是调查的旋转幸存的同伴后,超新星爆炸的WD+MS的情况。我们使用Eggleton的代码,包括光学厚吸积风模型,以获得现实的同伴模型。SN爆炸波对这些同伴的影响是遵循在3D流体动力学模拟采用SPH代码GADGET 3。我们发现,伴星的旋转并不显着影响剥离的质量和反冲速度所造成的SN影响的量。然而,在我们的模拟中,由于伴星的膨胀以及55%-89%的初始角动量被剥离物质带走的事实,伴星的旋转速度显着降低到爆炸前的14%-32%。与观测到的第谷SN的伴星Tycho G的旋转速度6 km/s相比,我们得到的最终旋转速度仍然高出至少两倍。这一差异是否显著,是否会对第谷G是SN 1572的伴星的说法产生怀疑,还有待于未来的研究。基于二进制人口合成的结果,我们提出的,第一次,预期的分布的旋转速度的同伴爆炸后,这可能提供有用的信息,为识别幸存的同伴在观测搜索在其他历史的信噪比。

英文摘要:

In the SD scenario of SNe Ia the companion survives the SN explosion and thus should be visible near the center of the SN remnant and may show some unusual features. A promising approach to test progenitor models of SNe Ia is to search for the companion in SNRs. Here we present the results of 3D hydrodynamics simulations of the interaction between the SN Ia blast wave and a MS companion taking into consideration its orbital motion and spin. The primary goal of this work is to investigate the rotation of surviving companions after SN Ia explosions in the WD+MS scenario. We use Eggleton's code including the optically thick accretion wind model to obtain realistic models of companions. The impact of the SN blast wave on these companions is followed in 3D hydrodynamic simulations employing the SPH code GADGET3. We find that the rotation of the companion does not significantly affect the amount of stripped mass and the kick velocity caused by the SN impact. However, in our simulations, the rotational velocity of the companion is significantly reduced to about 14% to 32% of its pre-explosion value due to the expansion of the companion and the fact that 55%-89% of the initial angular momentum is carried away by the stripped matter. Compared with the observed rotational velocity of the presumed companion star of Tycho's SN, Tycho G, of 6 km/s the final rotational velocity we obtain is still higher by at least a factor of two. Whether this difference is significant, and may cast doubts on the suggestion that Tycho G is the companion of SN 1572, has to be investigated in future studies. Based on binary population synthesis results we present, for the first time, the expected distribution of rotational velocities of companions after the explosion which may provide useful information for the identification of the surviving companion in observational searches in other historical SNRs.

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