The late-time light curves of Type Ia supernovae: confronting models with observations
The late-time light curves of Type Ia supernovae: confronting models with observations
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Ia 型超新星的晚期光变曲线：模型与观测的对峙
DOI：
10.1093/mnras/stac1618
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发表时间：
2022
影响因子：
4.8
通讯作者：
Shen Ken
中科院分区：
文献类型：
--
作者：
Tiwari Vishal;Graur Or;Fisher Robert;Seitenzahl Ivo;Leung Shing-Chi;Nomoto Ken’ichi;Perets Hagai Binyamin;Shen Ken
Ia型超新星（SNe Ia）在哈勃常数和暗能量的测量中扮演着至关重要的角色。越来越多的证据指向多个可能的爆炸通道作为正常Ia超新星的起源，可能对宇宙学参数的确定产生系统性影响。我们提出，第一次，全面比较公开可用的超新星Ia模型核合成数据与观测的晚时间光变曲线观测的超新星Ia事件。这些模型涵盖了广泛的白色矮星（WD）的祖质量，金属丰度，爆炸通道，和数值方法。我们专注于57 Ni和它的同量异位衰变产物57 Co在供电的晚时间（t> 1000 d）的光变曲线的SNe Ia的影响。57 Ni和57 Co是相对于更丰富的放射性同位素56 Ni的中子丰富，因此是一个敏感的探针的中子化在较高密度的near-MCh（near-MCh）祖WD。我们证明了一个超新星Ia事件的观测结果，SN 2015 F只与亚克拉塞卡（亚MCh）WD祖先一致。其他四个事件（SN 2011fe，SN 2012cg，SN 2014J和SN 2013aa）的观测结果与近MCh和亚MCh祖细胞一致。继续观测附近Ia型超新星的后期光变曲线将提供关于Ia型超新星祖先性质的重要信息。
Type Ia supernovae (SNe Ia) play a crucial role as standardizable candles in measurements of the Hubble constant and dark energy. Increasing evidence points towards multiple possible explosion channels as the origin of normal SNe Ia, with possible systematic effects on the determination of cosmological parameters. We present, for the first time, a comprehensive comparison of publicly available SN Ia model nucleosynthetic data with observations of late-time light curve observations of SN Ia events. These models span a wide range of white dwarf (WD) progenitor masses, metallicities, explosion channels, and numerical methodologies. We focus on the influence of57Ni and its isobaric decay product57Co in powering the late-time (t> 1000 d) light curves of SNe Ia.57Ni and57Co are neutron-rich relative to the more abundant radioisotope56Ni, and are consequently a sensitive probe of neutronization at the higher densities of near-Chandrashekhar (near-MCh) progenitor WDs. We demonstrate that observations of one SN Ia event, SN 2015F is only consistent with a sub-Chandrasekhar (sub-MCh) WD progenitor. Observations of four other events (SN 2011fe, SN 2012cg, SN 2014J, and SN2013aa) are consistent with both near-MChand sub-MChprogenitors. Continued observations of late-time light curves of nearby SNe Ia will provide crucial information on the nature of the SN Ia progenitors.