Utilizing varied ground-based telescopes, astronomers have carried out photometric and spectroscopic observations of a close-by Kind Ia supernova generally known as SN 2020nlb. Outcomes of the observations marketing campaign, presented January 16 on the pre-print server arXiv, ship vital insights concerning the evolution of this stellar explosion.
Kind Ia supernovae (SN Ia) are present in binary techniques during which one of many stars is a white dwarf. Stellar explosions of this sort are vital for the scientific group, as they provide important clues into the evolution of stars and galaxies.
SN 2020nlb was detected on June 25, 2020 with the Asteroid Terrestrial-impact Final Alert System (ATLAS), shortly after its explosion within the lenticular galaxy Messier 85 (or M85 for brief), positioned some 60 million light years away. Spectroscopic observations of SN 2020nlb, commenced shortly after its detection, confirmed that it’s a Kind Ia supernova.
A staff of astronomers led by Steven Williams of the College of Turku, Finland, started to observe SN 2020nlb 16 hours after it was found. The observations, utilizing primarily the Liverpool Telescope (LT) and Nordic Optical Telescope (NOT), offered a wealth of knowledge concerning the properties of this supernova.
“Right here we current observations that embody one of many earliest high-quality spectra and a number of the earliest multi-color photometry of an SN Ia so far,” the researchers wrote.
The photometric and spectroscopic observations performed by Williams’ staff lasted till nearly 600 days after the explosion of SN 2020nlb. It was estimated that the supernova was found simply two days after its first mild.
The observations discovered that SN 2020nlb light 1.28 magazine within the B band through the first 15 days after most brightness. Due to this fact, it was declining quicker than a mean regular Kind Ia supernova, which means that it has a decrease luminosity than the everyday SNe of this class.
The spectrum of SN 2020nlb taken almost three days after the primary mild exhibits robust options from singly ionized metals. Furthermore, a nebular spectrum taken 594 days after the utmost mild exhibits that the robust iron emission line had disappeared, with the ionization stability of the ejecta falling.
The earliest spectra of SN 2020nlb resembled the maximum-light spectra of SN 1991bg, and related supernovae. Afterward, the spectra of SN 2020nlb developed to turn out to be hotter and extra just like SN 2011fe because it brightened in the direction of peak.
Based on the authors of the paper, the nebular spectra of SN 2020nlb, when in comparison with different SNe Ia nebular spectra level to a potential pattern the place SNe that had been extra luminous at peak are likely to have increased ionization within the nebular phase. This may occasionally point out that there’s something essentially totally different about SN 2020nlb and related SNe than the majority of the traditional SN Ia inhabitants.
Extra info:
S. C. Williams et al, Observations of sort Ia supernova SN 2020nlb as much as 600 days after explosion, and the gap to M85, arXiv (2024). DOI: 10.48550/arxiv.2401.08759
Journal info:
arXiv
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