ZTF SN Ia DR2: Exploring SN Ia properties in the vicinity of under-dense environments
Jun 17, 2024
10 pages
Published in:
- Astron.Astrophys. 694 (2025) A7,
- Astron.Astrophys. 694 (2025) A7
- Published: Feb 1, 2025and
- Published: Feb, 2025
e-Print:
- 2406.11680 [astro-ph.CO]
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Abstract: (EDP Sciences)
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.Key words: supernovae: general / cosmology: observations / large-scale structure of UniverseNote:
- 10 pages, 8 figures. Submitted to A&A
References(88)
Figures(8)