ZTF-observed late-time signals of pre-ZTF transients

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Volume 697 (May 2025)

A&A, 697 (2025) A143

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Table 4.

Objects with detections whose origin was not immediately clear.

Pre-ZTF					ZTF excess

Name	Type	Discovery	z	Host	Start	Duration	g band	r band	i band	Inferred	Excess consistent with
		date		sep (″)	(d)	(d)	abs. mag	abs. mag	abs. mag	cause of excess	SN	host nucleus
SN 2017ige ⁽¹⁾	Ia	17-11-17	0.02431	0.99	1130 ⁽²⁾	90	−13.5 – −13.3	−14.3 – −13.6	–	Sibling	Yes	No
SN 2016cob	Ia-91T	26-05-16	0.02961	0.7	2080	480 ⁽³⁾	−15.3 – −14.7	−16.5 – −16.1	−17.2 – −16.4	CSM/Nuclear	Yes	Yes
SN 2017frh	Ia	17-07-17	0.032188	0.0	230 ⁽²⁾	180 ⁽³⁾	−15.6 – −14.9	−16.0 – −15.6	–	CSM/Nuclear	Yes	Yes
SN 2017fby	Ia	01-07-17	0.043513	0.73	1780	190 ⁽³⁾	–	−16.5 – −16.1	–	CSM/Nuclear	Yes	Yes
PTF10jtp	Ia	04-06-10	0.067	1.11	2670	200 ⁽³⁾	–	−16.5 – −16.3	–	Nuclear	Yes	Yes
AT 2017fwf	Cand.	01-08-17	0.033707	1.67	1690	410	–	−14.7 – −14.0	–	Nuclear	no	Yes
PSc130283	Ia	29-01-11	0.07622	0.44	3750	480 ⁽³⁾	–	−17.8 – −16.9	–	Nuclear	Yes	Yes
PTF13cow	Ia	07-08-13	0.086	0.56	2980	560 ⁽³⁾	−16.3 – −16.1	−17.4 – −17.1	–	Nuclear	No	Yes
iPTF15aow	Ia	06-05-15	0.07597	0.92	1970	1050 ⁽³⁾	−16.0 – −15.9	−17.2 – −16.4	−18.0 – −17.1	Nuclear	Yes	Yes

Notes. The first five columns give information on the original transient, and the last six columns give an overview of the binned ZTF detections. Start gives the time after discovery of the first detections in ZTF, and duration gives the length of these detections. Both are in rest frame days and rounded to 10 days. The g, r, and i columns give the range of detections in absolute magnitude if detected. Inferred cause of excess gives the type of object that best explains the detections. The last two columns state whether the excess is consistent with the SN and host nucleus location, respectively.

⁽¹⁾

SN 2017ige has two separate periods with detections. The second is shown in the table while the first is consistent with the radioactive tail phase of the SN Ia. It starts at 80 d after discovery (the start of the ZTF survey) and lasts for 150 d declining from −14.6 to −13.8 mag over this time in the g band.

⁽²⁾

Detected from the start of ZTF.

⁽³⁾

Start or end with a gap in the binned observations or at the edge of available data.

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