Aubert, M. and Rosnet, P. and Popovic, B. and Ruppin, F. and Smith, M. and Rigault, M. and Dimitriadis, G. and Goobar, A. and Johansson, J. and Barjou-Delayre, C. and Burgaz, U. and Carreres, B. and Feinstein, F. and Fouchez, D. and Galbany, L. and Ginolin, M. and Jaeger, T.D. and Kasliwal, M.M. and Kim, Y.-L. and Lacroix, L. and Masci, F.J. and Müller-Bravo, T.E. and Racine, B. and Ravoux, C. and Regnault, N. and Riddle, R.L. and Rosselli, D. and Rusholme, B. and Smith, R. and Sollerman, J. and Terwel, J.H. and Townsend, A. (2025) ZTF SN Ia DR2 : Exploring SN Ia properties in the vicinity of under-dense environments. Astronomy and Astrophysics, 694: A7. ISSN 1432-0746
Full text not available from this repository.Abstract
Context. The unprecedented statistics of detected Type Ia supernovae (SNe Ia) brought by the Zwicky Transient Facility (ZTF) enable us to probe the impact of the large-scale structure (LSS) on the properties of these objects. Aims. The goal of this paper is to explore the possible impact of the under-dense part of the LSS on the intrinsic SALT2 light-curve properties of SNe Ia and uncover possible biases in SN Ia analyses. Methods. With a volume-limited selection of ZTF-Cosmo-DR2 SNe Ia overlapping with the SDSS-DR7 survey footprint, we investigated the distribution of their properties with regard to voids detected in the SDSS-DR7 galaxy sample. We further used Voronoi volumes as a proxy for local density environments within the LSS. Results. We find a moderate dependency of the stretch on the localisation around the void centre and none when considering colour. The local Voronoi volumes mostly affect the fraction of low- and high-stretch supernovae. Conclusions. With the presently available statistics, we consider that the impact of high- or low-local-density environment can be considered as a proxy for the colour of the host galaxy. Under-dense environments should not cause any biases in analyses of supernova.