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) reports 9 candidate SLSNe, following the methodology outlined by Perley et al. (in prep.) We selected transients that have a long rise time (>30 days) and a faint host galaxy. Among them, we note that ZTF21abqtckk is a possible TDE candidate.
We summarise properties of the candidates in the Related Objects Table. These include coordinates, current magnitudes, approximate rise times, photometric redshifts of potential host galaxies (taken from the SDSS DR14) and special remarks.
We will distribute alerts on such SLSN candidates via AstroNotes periodically; 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 Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
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 |
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TNS | 2021xts [ZTF21abvyxhc] | 18:55:29.956 | +52:25:59.55 | r=19.7 mag. There is a possible precursor 30 days pre-peak with r~21 mag. The light curve then rises rapidly (1.3 mag over 10 days) and is now declining (0.6 mag over the past 10 days). A faint host galaxy (r ~ 20.6 mag) is visible in the Legacy Survey. | 18:55:29.956 | +52:25:59.55 | ||||||
TNS | 2021xfu [ZTF21absyjff] | 17:42:41.204 | +52:11:10.50 | r=19.4 mag. Has been slowly rising by 1.2 mag over 38 days. A very faint (r~24.7 mag) potential host with photo-z of 0.228 is visible in Legacy Survey imaging. | 17:42:41.204 | +52:11:10.50 | SLSN-I | 0.32 | ||||
TNS | 2021uwd [ZTF21ablxgeu] | 01:52:40.770 | +20:14:39.81 | r=20.5 mag. The light curve rises slowly (~1 mag over the first 70 days), then fades rapidly (~1 mag over the most recent 20 days). Host r=19.6 mag. | 01:52:40.770 | +20:14:39.81 | ||||||
TNS | 2021yvn [ZTF21abqhhjh] | 22:52:47.383 | +07:34:53.40 | r=20.2 mag. The light curve shows little variation over the past for 70 days, but no counterpart is visible in deep Legacy Survey imaging. | 22:52:47.383 | +07:34:53.40 | ||||||
TNS | 2021utq [ZTF21abqtckk] | 15:18:29.080 | +73:21:31.43 | g=18.6 mag. The r-band light curve rises ~1.4 mag over the first 20 days, then stays flat over the most recent 20 days. Has a compact, spheroidal host with a red color, and the transient location is consistent with its center. Potential TDE candidate. | 15:18:29.080 | +73:21:31.43 | TDE | 0.127 | ||||
TNS | 2021vuw [ZTF21abrqria] | 06:40:47.460 | +27:47:01.82 | r=18.7 mag. The light curve has been slowly rising by 0.8 mag for the past 35 day. No detected host to the depth of PS1. | 06:40:47.460 | +27:47:01.82 | SLSN-I | 0.2 | ||||
TNS | 2021xtn [ZTF21abvrqla] | 23:11:10.931 | +23:02:40.65 | r=19.6 mag. The light curve is slowly rising (0.5 mag over the past 22 days). Located offset from a faint (r~21.7 mag) galaxy with photo-z of 0.375. | 23:11:10.936 | +23:02:40.69 | ||||||
TNS | 2021yos [ZTF21abvqhfp] | 15:49:53.892 | +60:41:55.88 | g=20.0 mag. The light curve has been slowly rising by 0.5 mag for the past 35 day. No host galaxy within 2 arcsec in reference imaging. | 15:49:53.892 | +60:41:55.88 | ||||||
TNS | 2021ywc [ZTF21abxduvc] | 03:26:08.420 | +18:10:49.60 | r=20.0 mag. The g-band light curve has been rising by 0.6 mag for the past 28 days. Has a r=20.5 mag host with photo-z of 0.185. | 03:26:08.420 | +18:10:49.60 |
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