ZTF SN Ia DR2: The diversity and relative rates of the thermonuclear SN population
astro-ph.HE
/ Authors
G. Dimitriadis, U. Burgaz, M. Deckers, K. Maguire, J. Johansson, M. Smith, M. Rigault, C. Frohmaier, J. Sollerman, L. Galbany
and 21 more authors
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
/ 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.