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arXiv · 2409.04200

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

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·K. Phan·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 rarer 'peculiar' sub-classes. 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 sub-types and the normal SNe Ia. We also explore the properties of their host galaxies and estimate their relative rates, focusing on the peculiar sub-types 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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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, K. Phan, B. Popovic, R. L. Riddle, B. Rusholme, T. E. Muller-Bravo, J. Nordin, J. H. Terwel, A. Townsend. 2024-09-06. ZTF SN Ia DR2: The diversity and relative rates of the thermonuclear SN population. https://doi.org/10.1051/0004-6361/202451852

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