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Table A.1.

Information of SESNe observed in the THU sample.

SN R.A. Dec. Type Redshifta E(B − V)MWb Max. B Max. V Peak date refs.c
(J2000) (J2000) (MJD) (MJD)
css141005 02:23:15.64 −07:05:20.80 IIb 0.045 0.023 ... 56944 G21
iPTF13bvn 15:00:00.18 +01:52:53.5 Ib 0.00449 0.045 56474 56476 C13,F16
iPTF15eqv 10:52:08.33 +32:56:39.4 Ib(Ca-rich) 0.00529 0.021 57243 ... TNT,M17
PSNJ0110 01:10:11.91 +33:13:53.6 IIb 0.018 0.052 ... 57249 SNID
PSNJ0123 01:23:24.38 +09:25:54.5 Ib 0.00758 0.041 ... 56193 SNID
SN 2010ln 03:20:53.62 +38:15:11.9 Ib 0.0168 0.219 ... 55521 SNID
SN 2011ble 13:34:14.69 +37:12:34.7 Ic 0.0184 0.007 ... 55658 SNID
SN 2011dh 13:30:05.12 +47:10:11.3 IIb 0.002 0.032 55730 55733 TNT
SN 2011fu 02:08:21.41 +41:29:12.30 IIb 0.018489 0.068 55845 55847 M15
SN 2011jfe 02:38:54.61 +27:50:48.7 Ic 0.0153 0.152 ... 55922 SNID
SN 2012apf 05:00:13.72 −03:20:51.2 Ic-BL 0.0121 0.045 55974 55976 L15
SN 2012au 12:54:52.18 −10:14:50.2 Ib 0.0045 0.042 56004 56006 T13
SN 2012C 09:37:30.48 +32:50:31.5 Ic 0.0145 0.015 ... 55949 SNID
SN 2012cw 10:13:47.95 +03:26:02.6 Ic 0.004486 0.028 ... 56094 SNID
SN 2012ej 06:26:51.01 +36:07:17.4 Ic 0.0089 0.089 ... 56174 SNID
SN 2012fhe 10:43:34.05 +24:53:29.0 Ic 0.001935 0.029 ... 56070d SNID,Z22
SN 2013gee 10:34:48.46 +21:39:41.9 Ic 0.004356 0.020 56616 56620 TNT
SN 2014ad 11:57:44.44 −10:10:15.7 Ic-BL 0.0057 0.039 56735 56740 TNT,S18
SN 2014as 14:00:54.49 +40:58:59.6 Ic-BL 0.012469 0.013 ... 56772 TNT
SN 2014bl 13:25:38.81 +25:57:33.9 Ic 0.0377 0.013 ... 56812 TNT
SN 2014Cf 22:37:05.60 +34:24:31.9 Ib 0.002722 0.081 56668 56670 B14,Z25
SN 2014dj 00:57:40.18 +43:47:34.2 Ic 0.018 0.071 ... 56914 SNID
SN 2014ds 08:11:16.45 +25:10:47.4 IIb 0.0137 0.038 ... 56966 Z22
SN 2014eh 20:25:03.86 −24:49:13.3 Ic 0.010614 0.056 56973 56976 Z22
SN 2014Lf 12:18:48.68 +14:24:43.5 Ic 0.008029 0.034 56693 56694 Z18
SN 2015ah 23:00:24.63 +01:37:36.8 Ib 0.016 0.071 ... 57251 SNID
SN 2015bi 14:32:15.31 +26:19:32.02 IIb 0.016014 0.017 ... 57411 SNID
SN 2016adje 13:25:24.12 −43:00:57.9 Ic 0.001825 0.102 57431 57431 S16,S24,S22,B18
SN 2016ajo 18:44:12.49 +24:09:29.7 Ib 0.016 0.107 ... 57437 SNID
SN 2016bau 11:20:59.02 +53:10:25.6 Ib 0.003856 0.015 57474 57478 Z22
SN 2016bll 08:33:18.30 +19:20:44.8 Ib 0.019 0.028 ... 57453 SNID
SN 2016cce 13:33:27.20 +05:28:57.8 Ic 0.022 0.029 ... 57515 SNID
SN 2016coif 21:59:04.08 +18:11:10.46 Ib(BL) 0.0036 0.075 57548 57552 P18
SN 2016frp 00:21:32.54 −05:57:24.29 Ib 0.027 0.031 ... 57640 SNID
SN 2016G 03:03:57.74 +43:24:03.50 Ic-BL 0.0091 0.139 57409 57411 TNT
SN 2016hkn 02:08:34.23 +29:14:11.10 IIb 0.022 0.053 ... 57693 SNID
SN 2016iae 04:12:05.53 −32:51:44.75 Ic 0.003468 0.013 57708 57712 P19
SN 2016jdw 13:16:19.62 +30:40:32.67 Ib 0.0189 0.011 57760 57764 P19
SN 2016M 07:16:37.750 +67:53:32.30 IIb 0.036 0.037 ... 57404 SNID
SN 2016P 13:57:31.13 +06:05:51.6 Ic-BL 0.01462 0.024 57413 57417 G20
SN 2017bgu 16:55:59.47 +42:33:36.01 Ib 0.0085 0.019 57816 57818 TNT
SN 2017cxz 17:19:19.78 +57:53:55.80 Ib 0.0289 0.028 ... 57860 SNID
SN 2017einf 11:52:53.25 +44:07:26.2 Ic 0.0027 0.019 57910 57913 X19
SN 2017giq 23:57:54.73 +28:30:12.0 Ic 0.03 0.075 ... 57993 SNID
SN 2017gpnf 3:37:44.97 +72:31:59.00 IIb 0.0073 0.303 58001 ... B21
SN 2017ifh 06:35:03.56 +50:26:27.90 Ic-BL 0.039 0.117 58074 58076 TNT
SN 2017iro 14:06:23.11 +50:43:20.20 Ib 0.006191 0.016 58095 58098 TNT
SN 2017iuk 11:09:39.52 −12:35:18.34 Ic-BL 0.0368 0.045 58104 58105 D18
SN 2017jdn 10:23:45.51 +53:06:20.50 IIb 0.0317 0.020 ... 58099 SNID
SN 2018beh 09:31:23.03 +17:48:27.90 Ib 0.06 0.034 58243 58246 G22
SN 2018gep 16:43:48.22 +41:02:43.37 Ic-BL 0.032 0.009 58374 58375 P21
SN 2018gsk 04:09:11.62 +08:38:51.83 Ic 0.0116 0.227 ... 58387 SNID
SN 2018ie 10:54:01.040 −16:01:21.72 Ic-BL 0.014233 0.060 58138 ... P19
SN 2018if 09:14:23.840 +49:35:32.90 Ic-BL 0.031 0.012 58141 58142 TNT
SN 2019ehkf 12:22:56.130 +15:49:33.60 Ib 0.005 0.023 58615 58616 J20
SN 2019yvr 12:45:08.134 −00:27:32.73 Ib 0.005 0.022 58854 58855 K21
SN 2019yz 15:41:57.301 +00:42:39.45 Ic 0.006388 0.101 ... 58516 ZTF
SN 2020aaxf 08:20:41.967 −01:24:52.37 IIb 0.014 0.069 59197 59198 ZTF
SN 2020adow 08:33:42.262 +27:42:43.56 Ic-BL 0.007505 0.032 59217 59219 TNT
SN 2020hvp 16:21:45.390 −02:17:21.37 Ib 0.005247 0.140 58973 58975 TNT
SN 2020oif 12:22:54.925 +15:49:25.05 Ic 0.00524 0.023 58863 58866 R21
SN 2020zgle 23:28:01.150 −02:09:53.64 Ib 0.0065 0.051 59178 59180 ZTF

Notes.

a

Redshifts are spectroscopic redshifts sourced primarily from TNS and WiseRep.

b

Foreground Galactic extinctions are from Schlafly & Finkbeiner (2011), as accessed via the NASA/IPAC Extragalactic Database.

c

Method or references for the maximum time of SNe. TNT–TNT photometry, ZTF–ZTF photometry, SNID–in SNID release version 5.0 via templates-2.0 (Blondin & Tonry 2007) and SESNe template by Liu et al. (2016), B14–Brown et al. (2014), B18–Banerjee et al. (2018), B21–Balakina et al. (2021), C13–Cao et al. (2013), D18–D’Elia et al. (2018), F16–Fremling et al. (2016), G20–Gangopadhyay et al. (2020), G21–Grayling et al. (2021), G22–Gomez et al. (2022), J20–Jacobson-Galán et al. (2020), K21–Kilpatrick et al. (2021), L15–Liu et al. (2015), M15–Morales-Garoffolo et al. (2015), M17–Milisavljevic et al. (2017), P18–Prentice et al. (2018), P19–Prentice et al. (2019), P19–Prentice et al. (2019), P21–Pritchard et al. (2021), R21–Rho et al. (2021), S16–Stritzinger et al. (2016), S18–Sahu et al. (2018), S22–Stritzinger et al. (2022), S24–Stritzinger et al. (2024), T13–Takaki et al. (2013), X19–Xiang et al. (2019), Z18–Zhang et al. (2018), Z22–Zheng et al. (2022), Z25–Zhai et al. (2025).

d

SN 2012fh was discovered more than 100 days after peak and photometric observations started long after peak. The peak dates obtained from light curve fitting by Zheng et al. (2022) is quite close to the first data point. So peak date is determined by SNID fitting result.

e

These SNe are reclassified in this work.

SN 2011bl: Original classification of SN 2011bl is SN Ib/c (Latest Supernova) but no public spectrum is available. Our SNID analysis shows that its spectrum matches well with that of the normal SN Ic 2004aw at approximately −3 days. We therefore classify it as a normal SN Ic. SN 2011jf: This object has conflicting public classifications (SN Ib-pec on WiseRep; SN Ib/c on TNS). Our spectra and a spectrum from WiseRep are consistent with the normal SN Ic PTF12gzk near maximum light, though they also show some similarity to broad-lined SNe Ic at phases around +14 days. Given that our spectra were obtained very soon after discovery, we favor a normal SN Ic classification for SN 2011jf. SN 2012fh: Public classifications for this object are discrepant (SN Ib/c on TNS; SN Ib on WiseRep). Only nebular-phase spectra are available. As shown in Fig. 15, its nebular spectral parameters are markedly offset from the distribution of SNe Ib and are instead consistent with the median of the SNe Ic distribution. We therefore reclassify it as a type Ic. SN 2013ge: Public classifications for this object are inconsistent (SN Ic on TNS; SN Ib/c on WiseRep). Drout et al. (2016) noted the possible presence of weak He I lines and classified it as SN Ib/c, although they acknowledged this identification was uncertain. On the other hand, Some other works found the spectra of SN 2013ge very similar to those of SNe Ic such as SNe 2007gr, 2017ein. We decided to follow the classification in other literatures (Shivvers et al. 2019; Shahbandeh et al. 2022; Fang et al. 2022) to classify it as a normal type Ic. SN 2016adj: This object has discrepant public classifications (SN Ib on TNS; SN IIb on WiseRep). However, a recent study by the same group responsible for the original classification report has reclassified it as a type Ic, noting that weak hydrogen lines in its spectra may originate from interaction with hydrogen-rich circumstellar material (Stritzinger et al. 2024). We therefore adopt the type Ic classification. SN 2020zgl: It is publicly classified as SN Ib-pec (TNS and WiseRep). Our SNID analysis shows a good match to normal SNe Ib, such as SN 2004gv, at comparable phases. Consequently, we classify it as a normal type Ib.

f

The spectroscopic data for these supernovae have been published in the following references: SN 2012ap–Liu et al. (2015), SN 2014C–Zhai et al. (2025), SN 2014L–Zhang et al. (2018), SN 2016coi–Prentice et al. (2018), SN 2017ein–Xiang et al. (2019), SN 2017gpn–Balakina et al. (2021), SN 2019ehk–Jacobson-Galán et al. (2020), SN 2020oi–Rho et al. (2021).

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