[论文解读] The Pantheon+ Analysis: The Full Dataset and Light-Curve Release

D. Scolnic, Dillon Brout+28 more|arXiv (Cornell University)|Dec 7, 2021

Big Data Technologies and Applications被引用 24

一句话总结

本论文发布了来自18项调查的1550份经光谱学确认的Ia型超新星1701条光曲线，扩展了Pantheon的数据，加入低红移数据以实现联合H0和w分析。

ABSTRACT

Here we present 1701 light curves of 1550 spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part of the Pantheon+ SN analysis and the SH0ES (Supernovae and H0 for the Equation of State of dark energy) distance-ladder analysis. This effort is one part of a series of works that perform an extensive review of redshifts, peculiar velocities, photometric calibration, and intrinsic-scatter models of SNe Ia. The total number of light curves, which are compiled across 18 different surveys, is a significant increase from the first Pantheon analysis (1048 SNe), particularly at low redshift ($z$). Furthermore, unlike in the Pantheon analysis, we include light curves for SNe with $z<0.01$ such that SN systematic covariance can be included in a joint measurement of the Hubble constant (H$_0$) and the dark energy equation-of-state parameter ($w$). We use the large sample to compare properties of 151 SNe Ia observed by multiple surveys and 12 pairs/triplets of "SN siblings" - SNe found in the same host galaxy. Distance measurements, application of bias corrections, and inference of cosmological parameters are discussed in the companion paper by Brout et al. (2022b), and the determination of H$_0$ is discussed by Riess et al. (2022). These analyses will measure w with $\sim3\%$ precision and H$_0$ with 1 km/s/Mpc precision.

研究动机与目标

• 提供一个全面、标准化的SN Ia光曲线数据集用于宇宙学。
• 通过包含低红移超新星和全面的偏差建模来实现联合宇宙参数推断。
• 支持跨调查比较和SN兄弟分析，以量化Pantheon+数据集中的系统效应。

提出的方法

• 汇编来自18项调查的1550份经光谱学确认的SNe Ia的1701条光曲线。
• 包括z<0.01的超新星，以将SN系统偏差协方差纳入H0和w分析。
• 在附带论文中讨论距离测量、偏差修正和宇宙学推断。

实验结果

研究问题

• RQ1 将低红移SNe Ia扩展到Pantheon样本，如何影响H0和w的联合测量？
• RQ2 在同一宿主星系中由多个调查观测的151个SN Ia和12个SN兄弟揭示的跨调查一致性与系统偏差有哪些？
• RQ3 在Pantheon+中，哪些偏差和本征散射模型对鲁棒的SN宇宙学分析最为重要？

主要发现

• Pantheon+数据集包含来自18项调查的1550个SNe Ia的1701条光曲线，相比Pantheon（1048个SNe）有显著增加。
• 包括低红移超新星(z<0.01)以实现与SN系统偏差协方差相关的H0和w联合分析。
• 大型样本使在同一宿主星系中由多项调查观测的SN和SN兄弟之间直接进行比较成为可能。
• 宇宙学参数推断及偏差修正已在Brout et al. (2022b)和Riess et al. (2022)等附带论文中处理。
• 预计分析将实现对w约3%的精度和对H0约1 km/s/Mpc的精度。