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arxiv: 2409.04200 · v3 · pith:R4WE4E2Ynew · submitted 2024-09-06 · 🌌 astro-ph.HE

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
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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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classification 🌌 astro-ph.HE
keywords peculiarpropertiesdataexploremethodphotometricratesrelative
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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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  1. Observational signatures of thermonuclear electron-capture supernovae -- Ne II line strengthening and color evolution as traces of the explosion mechanism

    astro-ph.SR 2026-06 unverdicted novelty 7.0

    Synthetic observables from tECSN models show slower early red-color decline due to higher Ti/Cr and a late-time 12.8 μm Ne II line that strengthens over time, unlike comparable CO deflagration models.