arXiv 0909.21672009-09-11astro-ph.SR

不同金属丰度Ia型超新星的伴星

Companion Stars of Type Ia supernovae with different metallicities

Xiangcun Meng, Wuming Yang

备注：: 14 pages, 14 figures, accepted for publication in MNRAS
DOI：: 10.1111/j.1365-2966.2009.15701.x

摘要：

Meng，Chen & Han（2009）通过详细的双星演化计算，全面系统地研究了WD + MS系统。继他们的研究之后，我们进行了一系列关于不同金属丰度$Z$的Ia型超新星的伴随物性质的二元布居合成研究。本文给出了超新星爆发时刻不同$Z$的WD + MS系统的质量$M_{\rm 2}^{\rm SN}$、伴星半径$R_{\rm 2}^{\rm SN}$、周期$P_{\rm SN}$和间距半径比$A/R_{\rm 2}^{\rm SN}$的分布。这些参数可用于约束超新星喷出物与伴星相互作用的数值模拟。我们还给出了相互作用后不同$Z$的伴星的质量、空间速度和表面重力等积分性质的分布。这些分布可能有助于在超新星遗迹中寻找伴星。上述所有参数均随$Z$而显著改变。将Marietta等（2000）和Kasen等（2004）的超新星喷出物与伴星相互作用的模拟结果应用到我们的双星总体合成研究中，发现75%以上的超新星都有足够的偏振信号，可以被偏振光谱观测到。我们还发现13%到14%的Ia超新星属于像1991T这样的超新星，这与误差范围内的观测结果一致。这可能表明类SNe 1991T除了观察者的视角外没有任何特殊的物理性质。

英文摘要：

Meng, Chen & Han (2009) comprehensively and systemically studied the WD + MS system by detailed binary evolution calculations. Following their studies, we have carried out a series of binary population synthesis studies about the properties of the companions of SNe Ia for different metallicities $Z$. We present the distributions of the masses, $M_{\rm 2}^{\rm SN}$, the radii, $R_{\rm 2}^{\rm SN}$, of companions, and the periods, $P_{\rm SN}$, and the ratios of separations to radii, $A/R_{\rm 2}^{\rm SN}$, of WD + MS systems for various $Z$ at the moment of supernova explosion. These arameters can be applied to constrain the numerical simulation of the interaction between the ejecta of a supernova and its companion. We also show the distributions of some integral properties of companions, i.e. the mass, the space velocity and the surface gravity, for various $Z$ after the interaction. The distributions may help to search companion in a supernova remnant. All the parameters above significantly change with $Z$. Incorporating the simulation results of interaction between supernovae ejecta and companions in Marietta et al. (2000) and Kasen et al. (2004) into our binary population synthesis study, we found that more than 75% of all supernovae have enough polarization signal which can be detected by spectropolarimetric observations. We also found that 13 to 14 per cent SNe Ia belong to the supernovae like 1991T, which is consistent with observations within errors. This may indicate that SNe 1991T-like have not any special properties in physics except for the viewing angle of an observer.

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英文摘要：

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