作为SNIa辐射热光变曲线亮度-宽度关系中色散源的金属丰度
Metallicity as a source of dispersion in the SNIa bolometric light curve luminosity-width relationship
摘要：
人们认识到Ia型超新星（SNIa）祖先的金属丰度可能会使其在宇宙学应用中的应用产生偏差，这使得人们对它在SNIa光变曲线形成中的作用越来越感兴趣。我们探索了56 Ni的合成质量M（56 Ni）对前主序列模型的祖先金属丰度的敏感性，其中质量M0 = 2 - 7 Msun，金属丰度Z = 1 e-5 - 0.10。在慢炖阶段，对流混合和碳燃烧之间的相互作用最终增加了中子过剩，并导致较小的56 Ni产额，但基本上不会改变M（56 Ni）对Z的依赖性。WD的不确定属性，如中心密度，对M（56 Ni）的影响较小。我们的主要结果是：1）相当数量的56 Ni在不完全Si燃烧期间合成，这导致M（56 Ni）对Z的依赖性比通过假设56 Ni在完全燃烧到核统计平衡的材料中产生所获得的更强; 2）在一维延迟爆轰模拟中，燃烧转爆轰密度的成分依赖性给出了M（56 Ni）和Z，并预测了一个光度大于以前认为在低金属丰度（然而，祖金属丰度单独不能解释整个观测分散的SNIa光度），和3）的哈勃残差的斜率与金属丰度的一个足够大的数据集SNIa的精确测量可能会提供线索的物理学的爆燃到爆炸的转变在热核爆炸。
英文摘要：
The recognition that the metallicity of Type Ia supernova (SNIa) progenitors might bias their use for cosmological applications has led to an increasing interest in its role on the shaping of SNIa light curves. We explore the sensitivity of the synthesized mass of 56Ni, M(56Ni), to the progenitor metallicity starting from Pre-Main Sequence models with masses M0 = 2 - 7 M_sun and metallicities Z = 1e-5 - 0.10. The interplay between convective mixing and carbon burning during the simmering phase eventually rises the neutron excess and leads to a smaller 56Ni yield, but does not change substantially the dependence of M(56Ni) on Z. Uncertain attributes of the WD, like the central density, have a minor effect on M(56Ni). Our main results are: 1) a sizable amount of 56 Ni is synthesized during incomplete Si-burning, which leads to a stronger dependence of M(56Ni) on Z than obtained by assuming that 56Ni is produced in material that burns fully to nuclear statistical equilibrium; 2) in one-dimensional delayed detonation simulations a composition dependence of the deflagration-to-detonation transition density gives a non-linear relationship between M(56Ni) and Z, and predicts a luminosity larger than previously thought at low metallicities (however, the progenitor metallicity alone cannot explain the whole observational scatter of SNIa luminosities), and 3) an accurate measurement of the slope of the Hubble residuals vs metallicity for a large enough data set of SNIa might give clues to the physics of deflagration-to-detonation transition in thermonuclear explosions.
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