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arXiv 2104.00172astro-ph.CO
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用于拟合Ia型超新星光变曲线的修正SALT2表面

A Revised SALT2 Surface for Fitting Type Ia Supernova Light Curves

G. Taylor, C. Lidman, B. E. Tucker, D. Brout, S. R. Hinton, R. Kessler

摘要:

我们提出了一个修订的SALT 2表面(“SALT 2 - 2021”),以拟合Ia型超新星(SNe Ia)的光变曲线,其中包括零点校准偏移和银河系消光的新测量。新曲面中最显著的变化发生在UV区域。这个新的表面改变了SNe~Ia的距离测量,可以通过探测宇宙的膨胀历史来研究暗能量的性质。利用暗能量巡天超新星计划前三年的公开数据(结合外部低$z$超新星Ia样本)上的修正SALT 2表面,结合宇宙微波背景约束,我们发现暗能量状态方程参数$Δw = 0.015 \pm 0.004$发生了变化。这一结果突出了控制和减少系统不确定性的持续重要性,特别是下一代超新星分析旨在改善对暗能量属性的约束。

英文摘要:

We present a revised SALT2 surface (`SALT2-2021') for fitting the light curves of Type Ia supernovae (SNe Ia), which incorporates new measurements of zero-point calibration offsets and Milky Way extinction. The most notable change in the new surface occurs in the UV region. This new surface alters the distance measurements of SNe~Ia, which can be used to investigate the nature of dark energy by probing the expansion history of the Universe. Using the revised SALT2 surface on public data from the first three years of the Dark Energy Survey Supernova Program (combined with an external low-$z$ SNe Ia sample) and combining with cosmic microwave background constraints, we find a change in the dark energy equation of state parameter, $Δw = 0.015 \pm 0.004$. This result highlights the continued importance of controlling and reducing systematic uncertainties, particularly with the next generation of supernova analyses aiming to improve constraints on dark energy properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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