We report the classification of the optical transient AT 2024led (RA = 21:06:18.885 Dec=-01:03:59.76, z = 0.0967) as a SN-Ia. A flare in the same location ~133 days before the discovery of AT 2024led made this transient a potential candidate for a re-brightening of a nuclear transient (see Astronote #2024-313 and details therein).
Comparison with a library of supernovae spectra using SNID (Blondin & Tonry 2007, ApJ, 666, 1024), suggests AT 2024led is a pre-peak SN Ia (and some matches with a SN Ia-91T-like). However, the host contribution in the spectrum is significant and, since there is an SDSS spectrum available (SDSS J210618.86-010400.1, z = 0.0967), we attempted a quick subtraction of the host galaxy spectrum. Running SNID in the host-subtracted spectrum led to better matches with SN Ia-91T-like spectra. With a distance modulus of μ=37.69 (NASA/IPAC Extragalactic Database), the absolute magnitude of the pre-peak falre is currently at -19 mag (ZTF g-band).
| 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 | 2024led [ZTF24aarjcbz] | 21:06:18.885 | -01:03:59.76 | SN Ia | 0.097 | SDSS J210618.86-010400.1 | 0.0967048 | 21:06:18.814 | -01:04:00.06 | SN Ia | 0.097 |
| File | Comments |
|---|---|
 AT2024led_20241031_gr4_sl1_0_tns_snid_0.pdf | Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B). |
| AT2024led_20241031_gr4_sl1_0_tns_host_sub_snid.pdf | Host subtracted spectrum (host from SDSS). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B). |