AstroNote 2024-315

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DRAFT
2024-10-31 10:36:38
Type: Object/s-Discovery/Classification
Classification of the potential re-brightening nuclear transient AT 2024led, as a SN-Ia.
Authors: Panos Charalampopoulos (Univ. Turku)
Abstract:
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 (and potentially a SN Ia-91T-like). 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.

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).

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2024led [ZTF24aarjcbz]21:06:18.885-01:03:59.76SN Ia0.097SDSS J210618.86-010400.10.096704821:06:18.814-01:04:00.06SN Ia0.097