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; Pessi et al. 2024) reports 5 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 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.
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2024vxw [ZTF24abinngr] | 18:06:39.800 | +21:38:49.52 | Light curve shows a 30-day rise, then 30-day plateau; currently r~18.6. Host galaxy is relatively bright (r~19) and resolved. Previously reported as a SLSN candidate by NEEDLE (AstroNote 2024-301). | 18:06:39.800 | +21:38:49.52 | ||||||
| TNS | 2024vhc [ZTF24abhdwet] | 09:28:52.165 | +35:30:19.33 | Flat evolution for 2 months; currently r~19.5. Offset ~1 arcsec from center of a faint, blue, resolved host (SDSS photo-z 0.20 ± 0.09). Previously reported as a SLSN candidate by NEEDLE (AstroNote 2024-301). | 09:28:52.160 | +35:30:19.22 | ||||||
| TNS | 2024yfy [ZTF24abelpoe] | 21:20:08.105 | +02:23:40.07 | Light curve shows a gradual, 40-day rise then a 40-day plateau; currently r~20. Very faint underlying host (r~23.9 in Legacy Survey imaging). | 21:20:08.105 | +02:23:40.07 | ||||||
| TNS | 2024xnp [ZTF24ablleez] | 09:53:57.620 | +64:56:24.46 | Light curve is flat for at least 30 days with no discernable evolution. Currently r~19.5. Offset 1.5 arcsec east from barely-resolved galaxy at SDSS photo-z = 0.42 ± 0.14. | 09:53:57.669 | +64:56:24.46 | ||||||
| TNS | 2024xyy [ZTF24ablhyir] | 02:57:45.118 | +16:48:42.22 | Shows a gradual rise over 30 days, followed by a 10-day plateau; now r~19.5. Pre-discovery forced photometry shows a possible detection of an early bump on MJD 60577, but at low S/N. Offset by ~1.8 arcsec south of a faint (r~22.4), diffuse probable host in PS1 refefence imaging. | 02:57:45.118 | +16:48:42.22 | ||||||
| TNS | 2024aaob [ZTF24abgyycb] | 00:06:50.500 | +39:38:07.83 | Light curve shows an very gradual rise (1.5 mag over 70 days) with some bumps/undulations. Currently r~20. Hostless to the depth of PS1. | 00:06:50.500 | +39:38:07.83 | ||||||
| TNS | 2024ruw [ZTF24abalnuj] | 02:31:02.132 | +03:51:12.67 | SDSS J023102.16+035113.9 | Shows a 30-day rise (by 2 mag to a peak of ~19.1 mag), then 60 days of very gradual fading; currently r~19.6. Offset by ~1 arcsec from a bright (r~18.2 mag) galaxy or galaxy pair visible in reference imaging and other surveys, with SDSS photo-z 0.181 ± 0.024, implying a peak absolute magnitude of about -20.5. | 02:31:02.147 | +03:51:12.52 |
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