We obtained a spectrum with the DeVeny spectrograph at the 4.3-m Lowell Discovery Telescope on 9 March 2024. The spectrum shows narrow H-alpha and [O III]-5007 in emission at a redshift of 0.0673 instead of 0.1, as reported in Csoernyei et al. (2024, AstroNote, 2024-64). A further spectrum taken with the ALFOSC spectrograph at the 2.56-m Nordic Optical Telescope on 16 March 2024 also reveals narrow H-alpha at z=0.067, corroborating our redshift identification.
Multi-band photometry obtained with the IO:O camera at the 2-m Liverpool Telescope on 14 March 2024 shows that SN 2024amf is now around maximum light. The Milky-Way-extinction-corrected apparent magnitude of g=17.52 mag (17.78 - 0.30 mag) translates to an absolute magnitude of -19.9 mag (M = m - DM + 2.5 log(1+z), where DM is the distance modulus).
The luminosity of -19.9 is at the very faint end of the observed SLSN luminosity function (De Cia et al. 2018; Chen et al. 2023) and places 2024amf in the transitional regime between regular stripped-envelope supernovae and superluminous supernovae (e.g., Prentice et al. 2021).
We encourage further follow-up.
| 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 | 2024amf [ZTF24aadfmaf] | 15:34:23.330 | -00:08:07.98 | SLSN-I | 0.1 | 15:34:23.330 | -00:08:07.98 | SLSN-I | 0.067 |