II-P型超新星标准化的改进：应用于扩展样本
Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample
摘要：
在精确和准确的宇宙学时代，使用各种宇宙学方法的交叉确认对于规避系统不确定性至关重要。由于超新星的起源历史和爆炸物理与Ia型超新星（SNe Ia）不同，II型坪超新星（SNe II-P）不太可能以同样的方式受到演化的影响。基于对17个SNe II-P的新分析和改进的方法，我们发现SNe II-P是很好的可分解蜡烛，几乎可以与SNe Ia相媲美。利用Hamuy和Pinto在2002年提出的光度和光球速度之间的简单相关性，我们导出了一个距离色散为10%的紧密哈勃图。我们表明，Nugent等人2006年的下降方法可以进一步简化，尘埃消光的校正具有较低的统计影响。我们发现，我们的SN样本有利于，平均而言，一个非常陡峭的尘埃法律与总的选择性消光R_V<2。这样的灭绝规律最近已被推断为许多超新星Ia。我们的研究结果表明，距离测量可以得到一个单一的光谱的SN II-P在平台阶段结合稀疏的光度测量。
英文摘要：
In the epoch of precise and accurate cosmology, cross-confirmation using a variety of cosmographic methods is paramount to circumvent systematic uncertainties. Owing to progenitor histories and explosion physics differing from those of Type Ia SNe (SNe Ia), Type II-plateau supernovae (SNe II-P) are unlikely to be affected by evolution in the same way. Based on a new analysis of 17 SNe II-P, and on an improved methodology, we find that SNe II-P are good standardizable candles, almost comparable to SNe Ia. We derive a tight Hubble diagram with a dispersion of 10% in distance, using the simple correlation between luminosity and photospheric velocity introduced by Hamuy & Pinto 2002. We show that the descendent method of Nugent et al. 2006 can be further simplified and that the correction for dust extinction has low statistical impact. We find that our SN sample favors, on average, a very steep dust law with total to selective extinction R_V<2. Such an extinction law has been recently inferred for many SNe Ia. Our results indicate that a distance measurement can be obtained with a single spectrum of a SN II-P during the plateau phase combined with sparse photometric measurements.
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