ZTF SN Ia DR2: Exploring SN Ia properties in the vicinity of under-dense environments
| Autor: | Aubert, M., Rosnet, P., Popovic, B., Ruppin, F., Smith, M., Rigault, M., Dimitriadis, G., Goobar, A., Johansson, J., Barjou-Delayre, C., Burgaz, U., Carreres, B., Feinstein, F., Fouchez, D., Galbany, L., Ginolin, M., de Jaeger, T., Kasliwal, M. M., Kim, Y. -L., Lacroix, L., Masci, F. J., Müller-Bravo, T. E., Racine, B., Ravoux, C., Regnault, N., Riddle, R. L., Rosselli, D., Rusholme, B., Smith, R., Sollerman, J., Terwel, J. H., Townsend, A. |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | The unprecedented statistics of detected Type Ia supernovae (SNe Ia) brought by the Zwicky Transient Facility enables us to probe the impact of the Large-Scale Structure on the properties of these objects. The goal of this paper is to explore the possible impact of the under-dense part of the large-scale structure on the intrinsic SALT2 light curve properties of SNe Ia and uncover possible biases in SN Ia analyses. With a volume-limited selection of ZTF-Cosmo-DR2 Type Ia supernovae overlapping with the SDSS-DR7 survey footprint, we investigate the distribution of their properties with regard to voids detected in the SDSS-DR7 galaxy sample. We further use Voronoi volumes as proxy for local density environments within the large-scale structure. We find a moderate dependency of the stretch toward the localisation around the void centre and none when considering colour. The local Voronoi volumes mostly affect the fraction of low/high stretch supernovae. With the current statistics available, 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 supernova analyses. Comment: 10 pages, 8 figures. Submitted to A&A |
| Databáze: | arXiv |
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