We observed supernova 2023ozo with the 2.56-m Nordic Optical Telescope equipped with the ALFOSC spectrograph. The observation started at 21:04 UT on 16 August 2023. We used grism #4 and a 1''-wide slit.
The spectrum reveals a blue continuum with superimposed absorption lines from O II, corroborating Godson et al. (AstroNote, 2023-224). In addition, we detect weak, narrow [O III] 5007 and H-a in emission at a common redshift of z=0.055. Given this redshift, 2023ozo currently has an absolute magnitude of M_g = -19.6 mag [M = m - DM + 2.5 log10(1+z)], after also correcting for MW extinction of E(B-V) = 0.12 mag. The high luminosity, together with the young age of the SN (approximately a week), makes 2023ozo a very luminous and unusual stripped-envelope supernova. We echo Godson et al. (AstroNote, 2023-224) that 2023ozo could be a SLSN discovered shortly after explosion. Additional spectroscopic observations are highly encouraged.
| 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 | 2023ozo [ZTF23aawnoyx] | 16:19:05.042 | -01:54:25.48 | SN | 0.055 | 16:19:05.040 | -01:54:25.45 | SN | 0.055 |
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