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EI2GYB > ASTRO 13.11.25 20:16l 51 Lines 4731 Bytes #999 (0) @ WW
BID : 47546_EI2GYB
Subj: Exploring the origin of a distant Type Ibn supernova
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Exploring the origin of a distant Type Ibn supernova found far from its host galaxy
An international team of astronomers has performed photometric and spectroscopic observations of a distant Type Ibn supernova known as SN 2024acyl. Results of the observational campaign, published November 6 on the arXiv preprint server, shed more light on the properties and origin of this supernova.
Type Ibn supernovae (SNe Ibn) are explosions whose spectra are characterized by low-velocity helium emission lines. They are thought to be the core-collapse explosions of massive stars whose ejecta interact with helium-rich circumstellar material. They also have relatively high peak luminosities and are blue at peak. Observations show that SNe Ibn are usually fast-evolving, with a short rise to peak brightness (less than two weeks) and a subsequent fast decline.
Far away from its host
SN 2024acyl is a normal Type Ibn supernova discovered on December 1, 2024 by the Asteroid Terrestrial-Impact Last Alert System (ATLAS). It was detected at a distance of some 398 million light years, with a large projected offset from its host galaxy-of approximately 114,000 light years.
Following the discovery of SN 2024acyl, a group of astronomers led by Yize Dong of the Harvard-Smithsonian Center for Astrophysics (CfA) initiated multiband photometric follow-up observations of this supernova using mainly the Las Cumbres Observatory Global Telescope Network, but also other ground-based facilities. The study, aimed at exploring SN 2024acyl's unusual offset from the host and at probing its nature, was complemented by spectroscopic data.
In general, the study found that SN 2024acyl shows the typical photometric and spectroscopic features for its class. The redshift of SN 2024acyl (approximately 0.027) was found to be consistent with that of CGCG 505-052, making it highly likely that the investigated supernova is associated with this galaxy.
It turns out that the star formation rate at the explosion site of SN 2024acyl is low. This, together with the large host offset, is unusual for a massive star's origin. Therefore, this finding raises the question of whether all Type Ibn SNe originate from massive stars.
A runaway star?
According to the study, SN 2024acyl is located at a projected distance of around 32,500 light years from the nearest significant light of its host galaxy. Based on the collected data, the astronomers cannot fully exclude the possibility that one of the seven extended sources near SN 2024acyl is its birth site.
"It is possible that the progenitor of SN 2024acyl was a runaway star, ejected from its birth site either through close encounters in a dense cluster or by the SN explosion of a primary star in a massive binary system," the researchers concluded.
In general, by analyzing the population of known Type Ibn SNe, the authors of the paper underscored the diversity in both host environments and spectral properties of these supernovae. They assume that this may point toward multiple progenitor channels for Type Ibn SNe.
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