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Table A.1.

SLSN I host galaxies used in our analysis.

Host galaxy Redshift Refs. (a) Complet. (b) N(c) Companion distance
(kpc)
DES13S2cmm 0.663 (1) Yes 1 4.1
DES14C1fi 1.302 (1) Yes 3 3.2, 3.9, 4.1
DES14X3taz 0.608 (1) Yes 0
DES15C3hav 0.392 (1) Yes 0
DES15E2mlf 1.861 (1) Yes 0
DES15S2nr 0.220 (1) No 0
DES15X1noe 1.188 (1) Yes 0
DES15S1nog 0.565 (1) Yes 1 2.2
DES15X3hm 0.860 (1) Yes 0
DES16C2nm 1.998 (1) Yes 0
DES16C3cv 0.727 (1) No 1 0.9
DES16C3dmp 0.562 (1) Yes 0
DES16C3ggu 0.949 (1) No 0
iPTF13bjz 0.271 (2) Yes 0
iPTF13cjq 0.396 (2) Yes 1 2.4
iPTF13dcc 0.431 (3) No 0
iPTF14dck 0.576 (4) Yes 0
iPTF14dek 0.332 (4) Yes 2 2.2, 4.8
PS1-10bzj 0.650 (5) Yes 0
PS1-10pm 1.206 (5) Yes 1 3.5
PS1-11afv 1.407 (5) Yes 1 2.4
PS1-11aib 0.997 (5) Yes 0
PS1-11ap 0.524 (5) Yes 0
PS1-11bam 1.565 (5) Yes 0
PS1-11bdn 0.738 (5) Yes 0
PS1-11tt 1.283 (5) Yes 1 2.3
PS1-12bmy 1.572 (5) Yes 1 2.5
PS1-12bqf 0.522 (5) Yes 0
PTF09as 0.186 (6) Yes 0
PTF09atu 0.501 (6, 7) No 0
PTF09cnd 0.259 (6, 7) Yes 1 1.2
PTF10aagc 0.207 (6) Yes 2 1.0, 1.4
PTF10bfz 0.169 (6) Yes 2 0.9, 2.3
PTF10bjp 0.359 (6) Yes 0
PTF10hgi 0.098 (6) Yes 1 0.8
PTF10nmn 0.124 (6) Yes 0
PTF10vqv 0.452 (6) Yes 1 2.9
PTF11hrq 0.057 (6, 8) Yes 1 0.8
PTF12dam 0.108 (8, 9) Yes 1 1.1
PTF12gty 0.177 (6) No 1 3.4
PTF12mxx 0.327 (6) Yes 4 1.1, 2.5, 3.9, 4.5
SCP06F6 1.189 (5, 7) No 0
SN2005ap 0.283 (7) Yes 1 1.2
SN2006oz 0.396 (10, 11) Yes 0
SN2007bi 0.128 (5, 7) Yes 0
SN2010gx 0.230 (5, 7) Yes 0
SN2011ke 0.143 (5, 7) Yes 0
SN2012il 0.175 (5,7) Yes 5 0.8, 1.4, 1.8, 2.2, 3.0
SN2015bn 0.114 (12) Yes 0

Notes.

(a)

Reference to SLSN host study (with HST, if available) used here for the host identification, or to SLSN study (if no host study is available): (1) Angus et al. (2019), (2) De Cia et al. (2018), (3) Vreeswijk et al. (2017), (4) Schulze et al. (2020), (5) Lunnan et al. (2015), (6) Perley et al. (2016b), (7) Angus et al. (2016), (8) Cikota et al. (2017), (9) Thöne et al. (2015), (10) Leloudas et al. (2012), (11) Schulze et al. (2018), (12) Nicholl et al. (2018).

(b)

Image completeness: this column describes whether the image depth allows the detection of a companion four times fainter than the host (the limit for our definition of a major merger).

(c)

Number of major companions within 5 kpc.

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