The Zwicky Transient Facility (ZTF; Bellm et al. 2019; Graham et al. 2019) Superluminous Supernova Science Program (Lunnan et al. 2020; Yan et al. 2020; Chen et al. 2023a,b) reports 7 candidate SLSNe, following the methodology outlined by Perley et al. (in prep.) We selected transients that have long rise time (>20 days) and/or faint host galaxies.
We summarise the properties of the candidates in the Related Objects table. The listed parameters include sky coordinates, current magnitudes, approximate rise times, photometric redshifts of potential host galaxies from SDSS DR14 (Abolfathi et al. 2018), host morphologies based on Pan-STARRS DR2 imaging (Flewelling et al. 2019), and additional special remarks.
Spectroscopic classifications and additional follow-up observations of these transients are encouraged.
This report is based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Award #2407588 and a partnership including Caltech, USA; Caltech/IPAC, USA; University of Maryland, USA; University of California, Berkeley, USA; University of Wisconsin at Milwaukee, USA; Cornell University, USA; Drexel University, USA; University of North Carolina at Chapel Hill, USA; Institute of Science and Technology, Austria; National Central University, Taiwan, and OKC, University of Stockholm, Sweden. Operations are conducted by Caltech's Optical Observatory (COO), Caltech/IPAC, and the University of Washington at Seattle, USA.
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2025wqw [ZTF25abnmvkd] | 20:03:17.850 | +06:46:13.56 | r~20 mag (8 days ago). The light curve exhibits an initial slow rise of ~1.3 mag over 25 days, followed by a plateau phase lasting about 20 days, and is currently in decline. No host galaxy is detected in the Pan-STARRS DR2 stacked images. | 20:03:17.850 | +06:46:13.56 | ||||||
| TNS | 2025zqg [ZTF25abtlpwf] | 16:38:00.332 | +58:38:51.61 | r~20 mag (6 days ago). The light curve shows a gradual rise of about 1 mag over a span of ~50 days, with an early-time excess feature that may correspond to a pre-peak bump. No host galaxy is detected in the Pan-STARRS DR2 stacked images. | 16:38:00.332 | +58:38:51.61 | ||||||
| TNS | 2025wxd [ZTF25abmvftr] | 22:08:48.923 | +31:56:09.09 | r~20 mag. The light curve exhibits a slowly rise of ~1.5 mag over ~35 days, followed by a ~20-day around peak brightness, and has now begun to decline. A potential host galaxy (with g=21.9, r=21.7) is detected in the Pan-STARRS DR2 stacked images. | 22:08:48.923 | +31:56:09.09 | ||||||
| TNS | 2025xjw [ZTF25abqdgrb] | 21:53:34.308 | -18:24:06.60 | r~19.4 mag (4 days ago).The light curve shows a slow rise of ~2 mag over ~40 days and has now started to decline. A potential host galaxy (with g=20.7, r=20.5) is detected in the Pan-STARRS DR2 stacked images. | 21:53:34.308 | -18:24:06.60 | ||||||
| TNS | 2025xmy [ZTF25abqnaho] | 00:03:14.973 | +28:26:58.89 | SDSS J000314.98+282659.5 | r~19.6 mag. The light curve exhibits a slow rise of ~1 mag over a period of ~40 days and has now begun to decline. The probable host galaxy has a photometric redshift of z = 0.164 ± 0.049 from SDSS, corresponding to an absolute peak magnitude for the transient of M ~ −20 mag. The object was also identified as a SLSN candidate by NEEDLE (Sheng et al. 2025; AstroNote 2025-301). | 00:03:14.967 | +28:26:58.94 | |||||
| TNS | 2025zmb [ZTF25abuovxv] | 06:09:46.701 | +35:34:19.97 | r=19 mag. The light curve shows a rise of ~2 mag over a period of ~50 days, with an early-time excess feature that may correspond to a pre-peak bump. The probable host galaxy is red even after accounting for significant Galactic extinction in this direction. The photometric redshift of z = 0.339 ± 0.021 from SDSS, corresponding to a peak absolute magnitude for the transient (after extinction correction) of M ~ −23.1 mag. The object was also identified as a SLSN or TDE candidate by NEEDLE (Sheng et al. 2025; AstroNote 2025-307). | 06:09:46.694 | +35:34:19.94 | ||||||
| TNS | 2025ywm [ZTF25abtymyl] | 17:05:48.460 | +34:07:32.32 | r~20 mag. The light curve exhibits a slow rise of ~1.5 mag over ~20 days, followed by a ~14-day phase around peak brightness, and has now begun to decline. A faint, diffuse host galaxy is detected in the Pan-STARRS DR2 stacked images. | 17:05:48.460 | +34:07:32.32 |
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