ZTF SN~Ia DR2: Cosmology-independent constraints on Type Ia supernova standardisation from supernova siblings
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2024
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| author | Dhawan, S. Mortsell, E. Johansson, J. Goobar, A. Rigault, M. Smith, M. Maguire, K. Nordin, J. Dimitriadis, G. Nugent, P. E. Galbany, L. Sollerman, J. de Jaeger, T. Terwel, J. H. Kim, Y. -L. Burgaz, Umut Helou, G. Purdum, J. Groom, S. L. Laher, R. Healy, B. |
| author_facet | Dhawan, S. Mortsell, E. Johansson, J. Goobar, A. Rigault, M. Smith, M. Maguire, K. Nordin, J. Dimitriadis, G. Nugent, P. E. Galbany, L. Sollerman, J. de Jaeger, T. Terwel, J. H. Kim, Y. -L. Burgaz, Umut Helou, G. Purdum, J. Groom, S. L. Laher, R. Healy, B. |
| contents | Understanding Type Ia supernovae (SNe~Ia) and the empirical standardisation relations that make them excellent distance indicators is vital to improving cosmological constraints. SN~Ia ``siblings", i.e. two or more SNe~Ia in the same host or parent galaxy offer a unique way to infer the standardisation relations and their diversity across the population. We analyse a sample of 25 SN~Ia pairs, observed homogeneously by the Zwicky Transient Factory (ZTF) to infer the SNe~Ia light curve width-luminosity and colour-luminosity parameters $α$ and $β$. Using the pairwise constraints from siblings, allowing for a diversity in the standardisation relations, we find $α= 0.218 \pm 0.055 $ and $β= 3.084 \pm 0.312$, respectively, with a dispersion in $α$ and $β$ of $\leq 0.195$ and $\leq 0.923$, respectively, at 95$\%$ C.L. While the median dispersion is large, the values within $\sim 1 σ$ are consistent with no dispersion. Hence, fitting for a single global standardisation relation, we find $α= 0.228 \pm 0.029 $ and $β= 3.160 \pm 0.191$. We find a very small intrinsic scatter of the siblings sample $σ_{\rm int} \leq 0.10$ at 95\% C.L. compared to $σ_{\rm int} = 0.22 \pm 0.04$ when computing the scatter using the Hubble residuals without comparing them as siblings. Splitting the sample based on host galaxy stellar mass, we find that SNe~Ia in both subsamples have consistent $α$ and $β$. The $β$ value is consistent with the value for the cosmological sample. However, we find a higher $α$ by $\sim 2.5 - 3.5 σ$. The high $α$ is driven by low $x_1$ pairs, potentially suggesting that the slow and fast declining SN~Ia have different slopes of the width-luminosity relation. We can confirm or refute this with increased statistics from near future time-domain surveys. (abridged) |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_01434 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | ZTF SN~Ia DR2: Cosmology-independent constraints on Type Ia supernova standardisation from supernova siblings Dhawan, S. Mortsell, E. Johansson, J. Goobar, A. Rigault, M. Smith, M. Maguire, K. Nordin, J. Dimitriadis, G. Nugent, P. E. Galbany, L. Sollerman, J. de Jaeger, T. Terwel, J. H. Kim, Y. -L. Burgaz, Umut Helou, G. Purdum, J. Groom, S. L. Laher, R. Healy, B. Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Understanding Type Ia supernovae (SNe~Ia) and the empirical standardisation relations that make them excellent distance indicators is vital to improving cosmological constraints. SN~Ia ``siblings", i.e. two or more SNe~Ia in the same host or parent galaxy offer a unique way to infer the standardisation relations and their diversity across the population. We analyse a sample of 25 SN~Ia pairs, observed homogeneously by the Zwicky Transient Factory (ZTF) to infer the SNe~Ia light curve width-luminosity and colour-luminosity parameters $α$ and $β$. Using the pairwise constraints from siblings, allowing for a diversity in the standardisation relations, we find $α= 0.218 \pm 0.055 $ and $β= 3.084 \pm 0.312$, respectively, with a dispersion in $α$ and $β$ of $\leq 0.195$ and $\leq 0.923$, respectively, at 95$\%$ C.L. While the median dispersion is large, the values within $\sim 1 σ$ are consistent with no dispersion. Hence, fitting for a single global standardisation relation, we find $α= 0.228 \pm 0.029 $ and $β= 3.160 \pm 0.191$. We find a very small intrinsic scatter of the siblings sample $σ_{\rm int} \leq 0.10$ at 95\% C.L. compared to $σ_{\rm int} = 0.22 \pm 0.04$ when computing the scatter using the Hubble residuals without comparing them as siblings. Splitting the sample based on host galaxy stellar mass, we find that SNe~Ia in both subsamples have consistent $α$ and $β$. The $β$ value is consistent with the value for the cosmological sample. However, we find a higher $α$ by $\sim 2.5 - 3.5 σ$. The high $α$ is driven by low $x_1$ pairs, potentially suggesting that the slow and fast declining SN~Ia have different slopes of the width-luminosity relation. We can confirm or refute this with increased statistics from near future time-domain surveys. (abridged) |
| title | ZTF SN~Ia DR2: Cosmology-independent constraints on Type Ia supernova standardisation from supernova siblings |
| topic | Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2406.01434 |