PMAS observing campaign at Calar Alto 3.5m Telescope - Local host properties of nearby type Ia supernovae

Ia型超新星(SNE Ia)是目前被证明是测量暗能量状态方程的最强技术，它们为直接测量哈勃常数H0提供了一个关键工具。然而，由于它们的祖先尚未确定，因此可能存在不受控制的宇宙学偏见。宿主研究强调了SNE Ia与足以引起系统误差的全球特性之间的相关性。在此背景下，Rigault等人。2013年的情况表明，通过分析SN的封闭环境，可以更好地理解这些偏见。在这里，我们建议更进一步，对非常近的SNE Ia的直接环境中的恒星种群进行第一次研究，以便显著改善我们对SN-宇宙环境偏差的控制。

Type Ia supernovae (SNe Ia) present today the strongest demonstrated technique for measuring the dark energy equation of state, and they off a key tool for the direct measurement of the Hubble constant parameter H0. However, as their progenitors are as yet undetermined, there are potentially uncontrolled cosmological biases. Host studies have highlighted correlations between SNe Ia and global properties sufficient to induce systematic errors. In this context, Rigault et al. 2013 demonstrated that analyzing the close environment of the SN enabled a better understanding of those biases. Here, we propose to go a step further by conducting the first study of the stellar populations in the direct environment of very nearby SNe Ia in order to significantly improve our control on SN-cosmological environmental biases.