Astronomy:SN 2024aecx
| File:300px SN 2024aecx and the host galaxy NGC 3521 imaged by the Hubble Space Telescope | |
| Event type | Supernova |
|---|---|
| Spectral class | Type Ic |
| Date | 16 December 2024 by ATLAS |
| Constellation | Leo |
| Right ascension | 11h 05m 49.544s |
| Declination | –00° 02′ 05.46″ |
| Epoch | J2000 |
| Distance | c. 36 million ly |
| Redshift | 0.002665 |
| Host | NGC 3521 |
| Total energy output | 0.16×1051 ergs |
SN 2024aecx was a Type Ic supernova that occurred inside NGC 3521, an intermediate spiral galaxy located around 11 megaparsecs away in the constellation of Leo.[1] It was one of the closest stripped-envelope supernovae (SESNe) to Earth. The progenitor star had a mass of around 169–200 solar radii.
The energy produced by the supernova is estimated to be around 0.16×1051 ergs. Around 0.7 solar masses worth of material was ejected and there were around 0.15 solar masses worth of nickel-56 produced by the explosion.[2]
Observational history
It was discovered by ATLAS (Asteroid Terrestrial-impact Last Alert System) on 16 December 2024. The pre-explosion image of SN 2024aecx was available from both the Hubble Space Telescope and the James Webb Space Telescope. This means that it could be extensively studied, including the properties of its progenitor star and its environment in remarkable detail.[3]
The spectral evolution of SN 2024aecx was rapid, which is why it is thought to be a stripped supernova or a peculiar Type Ic supernova. Early spectra that were taken showed there were weak signatures of hydrogen lines that would disappear in about 30 days. In all light bands there were two distinctive peaks, with the first peak likely being a result of shock cooling emissions. During the first ~8 days (early epochs) of the event, the color trended towards a redder color with later bluer trends only to then later get redder again ~20 days after the explosion.[2]
References
- ↑ "2024aecx | Transient Name Server". https://www.wis-tns.org/object/2024aecx.
- ↑ 2.0 2.1 Zou, Xingzhu; Kumar, Brajesh; Teja, Rishabh Singh; Sahu, D. K.; Chen, Xinlei; Singh, Avinash; Lin, Weikang; Liu, Xiangkun et al. (2025-11-11), SN 2024aecx: A double-peaked rapidly evolving Type IIb supernova at 11 Mpc, http://arxiv.org/abs/2505.19831, retrieved 2025-11-19
- ↑ Shahbandeh, Melissa; Ashall, Chris; Baron, Eddie; Burns, Christopher; Coulter, David; Derkacy, James M.; Filippenko, Alex V.; Fox, Ori Dosovitz et al. (2024). "SN 2024aecx: A Gateway to Understanding Massive Star Deaths, Cosmic Dust, and Binary Systems". JWST Proposal. Cycle 3: 9233. Bibcode: 2024jwst.prop.9233S. https://ui.adsabs.harvard.edu/abs/2024jwst.prop.9233S/abstract.
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