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

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arxiv 2409.04200 v3 pith:R4WE4E2Y submitted 2024-09-06 astro-ph.HE

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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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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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The Evolution of Hypervelocity Supernova Survivors and the Outcomes of Interacting Double White Dwarf Binaries

    astro-ph.SR 2025-02 conditional novelty 7.0 of 10

    Cool hypervelocity supernova survivors are explained as low-mass, fully convective remnants cooling by Kelvin-Helmholtz contraction, implying about 2% of Type Ia supernovae eject such stars.

  2. ZTF SN Ia DR2: High-velocity components in the Si II $\lambda$6355

    astro-ph.HE 2025-02 conditional novelty 6.0 of 10

    About 76% of ZTF DR2 Type Ia supernova spectra more than 11 days before peak show a high-velocity component in Si II λ6355, a fraction that drops to about one third in the final week before maximum light.

  3. The type Ia supernova 2023vjh: a peculiar 1991bg-like SN with unusually faint light curves

    astro-ph.HE 2026-07 accept novelty 5.0 of 10

    SN 2023vjh is an unusually faint 91bg-like SN Ia whose light curves and colors suggest possible CSM extinction despite minimal host interstellar dust signatures.

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