ZTF SN Ia DR2: The diversity and relative rates of the thermonuclear SN population

arXiv - PHYS - High Energy Astrophysical Phenomena Pub Date : 2024-09-06 DOI:arxiv-2409.04200

G. Dimitriadis, U. Burgaz, M. Deckers, K. Maguire, J. Johansson, M. Smith, M. Rigault, C. Frohmaier, J. Sollerman, L. Galbany, Y. -L. Kim, C. Liu, A. A. Miller, P. E. Nugent, A. Alburai, P. Chen, S. Dhawan, M. Ginolin, A. Goobar, S. L. Groom, L. Harvey, W. D. Kenworthy, S. R. Kulkarni, B. Popovic, R. L. Riddle, B. Rusholme, T. E. Muller-Bravo, J. Nordin, J. H. Terwel, A. Townsend

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Abstract

The Zwicky Transient Facility SN Ia Data Release 2 (ZTF SN Ia DR2) contains more than 3,000 Type Ia supernovae (SNe Ia), providing the largest homogeneous low-redshift sample of SNe Ia. Having at least one spectrum per event, this data collection is ideal for large-scale statistical studies of the photometric, spectroscopic and host-galaxy properties of SNe Ia, particularly of the more rare "peculiar" subclasses. In this paper, we first present the method we developed to spectroscopically classify the SNe in the sample, and the techniques we used to model their multi-band light curves and explore their photometric properties. We then show a method to distinguish between the "peculiar" subtypes and the normal SNe Ia. We also explore the properties of their host galaxies and estimate their relative rates, focusing on the "peculiar" subtypes and their connection to the cosmologically useful SNe Ia. Finally, we discuss the implications of our study with respect to the progenitor systems of the "peculiar" SN Ia events.

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ZTF SN Ia DR2：热核SN群体的多样性和相对速率

兹威基瞬变设施SN Ia数据第2版（ZTF SN Ia DR2）包含了3000多个Ia型超新星（SNe Ia），提供了最大的同质低红移SNe Ia样本。由于每个事件至少有一个光谱，这个数据集非常适合对Ia型SNe的光度、光谱和宿主星系特性进行大规模统计研究，尤其是对比较罕见的 "奇特 "亚类进行研究。在本文中，我们首先介绍了我们开发的对样本中的SNE进行光谱分类的方法，以及我们用来模拟其多波段光曲线和探索其光度特性的技术。然后，我们展示了一种区分 "奇特 "亚型和正常偶发 Ia 的方法。最后，我们讨论了我们的研究对 "奇特 "SNe Ia 事件的原星系的影响。

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arXiv - PHYS - High Energy Astrophysical Phenomena

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