Utilizing the James Webb House Telescope (JWST), astronomers from the House Telescope Science Institute (STScI) have found a brand new supernova. Designated SN 2023adsy, the newfound stellar explosion is essentially the most distant Sort Ia supernova up to now detected. The discovering was detailed in a research paper revealed June 7 on the pre-print server arXiv.
Supernovae (SNe) are highly effective and luminous stellar explosions. They’re essential for the scientific neighborhood as they provide important clues into the evolution of stars and galaxies. Typically, SNe are divided into two teams primarily based on their atomic spectra: Sort I (no hydrogen of their spectra) and Sort II (showcasing hydrogen spectral strains).
Sort Ia supernovae (SN Ia) are present in binary programs wherein one of many stars is a white dwarf. Stellar explosions of this kind are essential for the scientific neighborhood, as they provide important clues into the evolution of stars and galaxies.
SN 2023adsy was initially recognized in 2023 as a transient object within the galaxy JADES-GS+53.13485−27.82088, at a redshift of two.9. Observe-up observations of SN 2023adsy urged that it could be a supernova of Sort Ia.
Now, a brand new examine performed by a group of astronomers led by STScI’s Justin R. Pierel confirms the earlier assumptions.
“We’ve got offered JWST observations of a SN (SN 2023adsy) with a spectroscopic redshift of z =2.903 ± 0.007, which we classify utilizing each the spectrum and light-weight curve data as essentially the most distant SN Ia but found,” the researchers wrote within the paper.
The obtained photographs present that SN 2023adsy could be very purple, which can be attributable to important dust attenuation from the host galaxy JADES-GS+53.13485−27.82088. Nonetheless, this galaxy has a comparatively low-mass, low-metallicity and low-extinction, therefore it signifies that SN 2023adsy may very well be intrinsically purple.
The examine discovered that SN 2023adsy showcases sturdy ionized calcium spectral lines (Ca II) in its spectrum, with a measured velocity of about 19,000 km/s. This can be a comparatively excessive velocity in comparison with the overall inhabitants of recognized SNe Ia.
The astronomers underline that whereas these peculiarities of SN 2023adsy are additionally observable in some calcium-rich Sort Ia supernovae, the newfound SN is intrinsically brighter than the general inhabitants of low-redshift calcium-rich SNe Ia.
Summing up the outcomes, the authors of the paper word that extra observations of Sort Ia supernovae are required so as to discover out whether or not SN 2023adsy, attributable to its peculiarities, is an outlier among the many inhabitants of SNe Ia, or the distribution of properties of those supernovae varies considerably with redshift attributable to modifications in progenitors or their surroundings.
“A bigger pattern of distant SNe Ia is required to find out if SN Ia inhabitants traits at high-z actually diverge from their low-z counterparts, and to substantiate that standardized luminosities nonetheless stay fixed with redshift,” the scientists conclude.
Extra data:
J. D. R. Pierel et al, Discovery of An Obvious Purple, Excessive-Velocity Sort Ia Supernova at z = 2.9 with JWST, arXiv (2024). DOI: 10.48550/arxiv.2406.05089
Journal data:
arXiv
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