A real-time search for Type Ia Supernovae with late-time interactions with circumstellar material in ZTF data

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Table 1.

Objects with a detected late-time signal in the binned ZTF light curves.

ZTF name	IAU name	RA	Dec	Type	z	MJD_peak-SN	MJD_disc-lt	MJD_start-lt	Δt (day)	Comment
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)
ZTF18abtqevs	SN 2018grt	00:04:36.30	51:59:37.63	Ia-norm	0.042 ± 0.003	58372	60279	59712	162	Terwel et al. (2025a)
ZTF19ablekwo	SN 2019mse	00:15:21.36	46:44:08.64	Ia-norm	0.088 ± 0.004	58715	60283	59167	1170 ⁽²⁾	Terwel et al. (2025a)
ZTF20abjfufv	SN 2020tfc	22:17:00.81	30:39:20.97	Ia-norm	0.031 ± 0.001	59116	60269	59671	804 ⁽³⁾	Terwel et al. (2025a)
ZTF20aaifyfx	SN 2020alm	16:52:01.49	23:32:22.77	Ia-norm	0.06001 ± 0.00001	58873	60271	59624	826 ⁽³⁾	Terwel et al. (2025a)
ZTF22abgbbez	SN 2022uej	07:19:57.72	46:00:59.00	Ia	0.03272 ± 0.00008	59839	60454	60168	212	r detected only
ZTF19acgonwy	SN 2019spg	08:21:48.09	−14:04:12.00	Ia	0.073 ± 0.001	58790	60353	58891	110	Nuclear
ZTF19abvvpoh	SN 2019pqn	16:04:03.86	18:28:18.46	Ia-norm	0.03720 ± 0.00001	58745	60458	60436	62 ⁽³⁾	Nuclear

ZTF20acpbbqf	SN 2020yvs	10:24:22.78	41:42:25.97	Ia-norm	0.04453 ± 0.00001	59160	60268	59260	1127	False positive
ZTF20aazhzna	SN 2020jsa	14:24:23.94	26:41:23.00	Ia-norm	0.03657 ± 0.00001	58992	60431	60315	72	Nuclear
ZTF18acaucsw	SN 2021nbt	22:42:29.54	01:49:53.84	Ia	0.07 ± 0.01	59359	60283	59718	730 ⁽³⁾	Nuclear/ANT
ZTF19adcdgca	SN 2019zbq	09:08:53.91	55:19:08.86	Ia	0.04678 ± 0.00001	58859	60261	59958	518 ⁽³⁾	Nuclear/ANT
ZTF20abqkbfx	SN 2020qxz	18:04:00.24	74:00:50.07	Ia-CSM	0.0964 ± 0.0004⁽¹⁾	59094	60388	60332	46	Late-time line emission

Notes. The table is divided into two parts: objects that were not followed up on (above) and objects that were followed up on (below the division line). The first two columns give the ZTF and IAU names of the object, followed by the position, classified type, and redshift. The classifications are taken from the ZTF DR2 release (Burgaz et al. 2025; Dimitriadis et al. 2025), except for SN 2022uej, whose classification comes from TNS. Column 7 gives the peak date of the SN, and column 8 gives the discovery date of the late-time signal. Column 9 gives the start of the first bin that is part of the late-time signal with the bin size that best shows the signal. Column 10 gives the duration of the late-time signal in rest-frame days. The last column is a comment on the nature of the late-time signal.

⁽¹⁾

z value as derived from the classification spectrum, see Section 4.2 for more details.

⁽²⁾

Two periods of detections were identified.

⁽³⁾

Active at the end of the monitoring period.

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