Table B.1.
Spectroscopic data of the 27 epochs used in our study.
| Target | MJD | Phase (d) | Telescope | Instrument | Source | texp (d) | L (log L⊙) | vinner (km s−1) |
|---|---|---|---|---|---|---|---|---|
| 2021fxy | 59291.11 | −13.9 ± 0.3 | SALT | RSS | a | 4.5 | 8.44 | 15300 |
| 2021fxy | 59294.17 | −10.9 ± 0.3 | NTT | EFOSC2 | this paper | 7.53 | 9.13 | 12400 |
| 2021fxy | 59297.04 | −8.0 ± 0.3 | LT | SPRAT | this paper | 10.38 | 9.43 | 11900 |
| 2021fxy | 59298.09 | −7.0 ± 0.3 | NOT | ALFOSC | b | 11.42 | 9.49 | 11600 |
| 2018cnw | 58286.55 | −15.1 ± 0.1 | Keck | LRIS | c | 5.5 | 8.8 | 18000 |
| 2018cnw | 58289.33 | −12.4 ± 0.1 | APO | DIS | c | 8.2 | 9.32 | 13900 |
| 2018cnw | 58290.34 | −11.4 ± 0.1 | DCT | Deveny+LMI | c | 9.2 | 9.42 | 13800 |
| 2018cnw | 58296.06 | −5.8 ± 0.1 | NOT | ALFOSC | c | 14.8 | 9.65 | 12200 |
| 2012fr | 56231.53 | −11.0 ± 0.3 | ANU-2.3m | WiFeS | d | 8.04 | 9.15 | 13100 |
| 2012fr | 56232.99 | −9.6 ± 0.3 | SAAO-1.9m | GS | d | 9.5 | 9.31 | 13000 |
| 2012fr | 56233.69 | −8.9 ± 0.3 | ANU-2.3m | WiFeS | d | 10.19 | 9.35 | 12975 |
| 2012fr | 56234.57 | −8.0 ± 0.3 | ANU-2.3m | WiFeS | d | 11.07 | 9.42 | 12800 |
| 2012fr | 56236.22 | −6.4 ± 0.3 | NTT | EFOSC2 | d | 12.71 | 9.49 | 12090 |
| 2021aefx | 59532.84 | −13.8 ± 0.7 | SALT | RSS | e | 4.5 | 8.51 | 16000 |
| 2021aefx | 59534.50 | −12.1 ± 0.7 | FTS | FLOYDS | e | 6.15 | 8.88 | 14300 |
| 2021aefx | 59536.44 | −10.2 ± 0.7 | FTS | FLOYDS | e | 8.08 | 9.18 | 13900 |
| 2021aefx | 59538.85 | −7.8 ± 0.7 | SALT | RSS | e | 10.48 | 9.40 | 13600 |
| 2009ig | 55065.51 | −14.9 ± 0.1 | Lick-3m | KAST | f | 3.5 | 8.47 | 18125 |
| 2009ig | 55067.52 | −12.9 ± 0.1 | Lick-3m | KAST | f | 5.5 | 8.95 | 16400 |
| 2009ig | 55068.52 | −11.9 ± 0.1 | Lick-3m | KAST | f | 6.5 | 9.1 | 16000 |
| 2009ig | 55070.50 | −10.0 ± 0.1 | Lick-3m | KAST | f | 8.5 | 9.27 | 14800 |
| 2009ig | 55071.53 | −8.9 ± 0.1 | Lick-3m | KAST | f | 9.5 | 9.34 | 14600 |
| 1994D | 49420.00 | −11.5 ± 0.5 | Lick-3m | KAST | g | 5.5 | 8.65 | 14000 |
| 1994D | 49421.36 | −10.1 ± 0.5 | MMT | MMTBlue | h | 6.86 | 8.97 | 12200 |
| 1994D | 49422.41 | −9.1 ± 0.5 | FLWO-1.5m | FAST | h | 7.91 | 9.14 | 12100 |
| 1994D | 49423.27 | −8.2 ± 0.5 | ESO-3.6m | EFOSC1 | i | 8.77 | 9.26 | 12000 |
| 1994D | 49424.00 | −7.5 ± 0.5 | Keck | LRIS | g | 9.5 | 9.34 | 11800 |
Notes. Further details on the telescopes and instruments can be found in the relevant listed source. The listed phases are with respect to maximum light in the rest-frame of the supernova. The final three columns present the TARDIS PV model inputs for each of the modelled spectra: rest-frame time since explosion (texp), requested luminosity (L), and inner boundary velocity (vinner).
References.a: Jha et al. (2021), obtained from the Transient Name Server2, b: DerKacy et al. (2023b), c: Rigault et al. (2025), d: Childress et al. (2013), e: Hosseinzadeh et al. (2022), f: Foley et al. (2012), g: Ruiz-Lapuente et al. (1997), h: Blondin et al. (2012), and i: Patat et al. (1996).
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