Table 5.
Robustness tests as described in Sect. 6.1.
| Test | NSN | KM | Δα | γ | γbroken−α |
|---|---|---|---|---|---|
| [σ] | [σ] | [mag] | [mag] | ||
| Fiducial | 945 | 9.2 | 13.4 | 0.143 ± 0.025 | 0.175 ± 0.010 |
| zmax = 0.05 | 613 | 7.9 | 11.9 | 0.164 ± 0.028 | 0.204 ± 0.011 |
| zmax = 0.07 | 1341 | 10.6 | 14.7 | 0.143 ± 0.017 | 0.182 ± 0.007 |
| Host z | 707 | 6.9 | 9.7 | 0.143 ± 0.024 | 0.163 ± 0.011 |
| incl. Ia-pec | 965 | 9.7 | 13.7 | 0.145 ± 0.022 | 0.182 ± 0.010 |
| no 91t | 878 | 8.8 | 15.0 | 0.150 ± 0.023 | 0.172 ± 0.012 |
| c < 0.3 | 852 | 9.1 | 10.0 | 0.144 ± 0.022 | 0.167 ± 0.012 |
| χSALT2 < 0.1 | 735 | 8.4 | 12.9 | 0.148 ± 0.021 | 0.182 ± 0.011 |
| Before Oct. 2019 | 451 | 5.4 | 7.3 | 0.132 ± 0.032 | 0.170 ± 0.011 |
| After Dec. 2019 | 420 | 6.8 | 11.8 | 0.162 ± 0.033 | 0.201 ± 0.013 |
Notes. Number of SNe in the sample, significance of the evolution of the stretch modes with colour (KM parameter from Eq. (3)), difference in α when fitting a broken standardisation law (using a variable cut) and step in local (g − z) (with and without broken-α standardisation), for each of the tests performed in Sects. 6.1–6.3.
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