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

Dimitriadis, G. and Burgaz, U. and Deckers, M. and Maguire, K. and Johansson, J. and Smith, M. and Rigault, M. and Frohmaier, C. and Sollerman, J. and Galbany, L. and Kim, Y.-L. and Liu, C. and Miller, A.A. and Nugent, P.E. and Alburai, A. and Chen, P. and Dhawan, S. and Ginolin, M. and Goobar, A. and Groom, S.L. and Harvey, L. and Kenworthy, W.D. and Kulkarni, S.R. and Phan, K. and Popovic, B. and Riddle, R.L. and Rusholme, B. and Müller-Bravo, T.E. and Nordin, J. and Terwel, J.H. and Townsend, A. (2025) ZTF SN Ia DR2 : The diversity and relative rates of the thermonuclear supernova population. Astronomy and Astrophysics, 694: A10. ISSN 1432-0746

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Abstract

The Zwicky Transient Facility SN Ia Data Release 2 (ZTF SN Ia DR2) contains more than 3000 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.

Item Type:
Journal Article
Journal or Publication Title:
Astronomy and Astrophysics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3103
Subjects:
?? astronomy and astrophysicsspace and planetary science ??
ID Code:
227964
Deposited By:
Deposited On:
14 Mar 2025 15:15
Refereed?:
Yes
Published?:
Published
Last Modified:
14 Mar 2025 15:15