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

Ia型超新星（SNe Ia）目前是测量暗能量状态方程的最强技术，它们提供了直接测量哈勃常数参数H0的关键工具。然而，由于它们的祖先尚未确定，因此存在潜在的不受控制的宇宙学偏见。宿主研究已经强调了Ia超新星和全局性质之间的相关性，足以引起系统误差。在这种情况下，Rigault等人（2013年）证明，分析SN的封闭环境可以更好地理解这些偏倚。在这里，我们建议更进一步，在非常接近的Ia超新星的直接环境中进行恒星种群的第一次研究，以显着提高我们对SN宇宙学环境偏差的控制。

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.