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Intrinsic color diversity of nearby Type Ia supernovae

机译:附近IA Supernovae的内在颜色多样性

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It has been reported that the extinction law for Type Ia supernovae (SNe Ia) may be different from the one in the Milky Way, but the intrinsic color of SNe Ia and the dust extinction are observationally mixed. In this study, we examine photometric properties of SNe Ia in the nearby universe (z less than or similar to 0.04) to investigate the SN Ia intrinsic color and the dust extinction. We focus on the Branch spectroscopic classification of 34 SNe Ia and morphological types of host galaxies. We carefully study the distribution of their peak colors on the B - V, V - R color-color diagram, as well as the color excess and absolute magnitude deviation from the stretch-color relation of the bluest SNe Ia. We find that SNe Ia which show the reddest color occur in early-type spirals and the trend holds when divided into Branch sub-types. The dust extinction becomes close to the Milky Way like extinction if we exclude some peculiar red Broad Line (BL) sub-type SNe Ia. Furthermore, two of these red BLs occur in elliptical galaxies, a less-dusty environment, suggesting intrinsic color diversity in BL sub-type SNe Ia.
机译:据报道,Ia型超新星(SNe-Ia)的消光规律可能与银河系中的不同,但SNe-Ia的本色和尘埃消光在观测上是混合的。在这项研究中,我们研究了附近宇宙(z小于或类似于0.04)中SN-Ia的光度特性,以研究SN-Ia的固有颜色和尘埃消光。我们重点研究了34个SNe Ia的分支光谱分类和宿主星系的形态类型。我们仔细研究了它们在B-V、V-R颜色图上的峰值颜色分布,以及与最蓝的SNe Ia的拉伸颜色关系的颜色过剩和绝对幅度偏差。我们发现,显示最红颜色的SNe Ia出现在早期类型的螺旋中,当划分为分支亚类型时,趋势保持不变。如果排除某些特殊的红宽线(BL)亚型SNe-Ia,尘埃消光将接近银河系消光。此外,其中两个红色BL出现在椭圆星系中,这是一个尘埃较少的环境,表明BL亚型SNe Ia具有内在的颜色多样性。

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