SN2024dde was originally classified as a SN Ia based on its spectrum and absolute magnitude, although with a note that the rise time was unusually long. The supernova is still rising in ZTF and ATLAS data, now for ~65 days and is currently at an absolute magnitude r = -19.8 mag, which is incompatible with a SN Ia explanation. While a spectrum obtained 2024-04-05 shows little evolution compared to the original classifiation spectrum, we note that it is an equally good match to peculiar SLSN-Ic such as SN2020wnt on the rise (see attached). Combining the light curve and spectroscopic information, we therefore re-classify this object as a SLSN-I.
We note that its luminosity lies in the boundary between typical SLSNe and luminous SNe Ic, and encourage continued 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 | 2024dde [ZTF24aagfeti] | 14:49:54.390 | +13:54:02.47 | SLSN-I | 0.054 | 14:49:54.368 | +13:54:02.39 | SLSN-I | 0.054 |
| File | Comments |
|---|---|
 SN2024dde_20wnt.png | Comparison of SN2024dde with SN2020wnt at 15 days before peak. |
