Observations explore the properties of Type Ic supernova SN 2022jli

A world group of astronomers has carried out multi-wavelength photometric and spectroscopic observations of a not too long ago found Kind Ic supernova referred to as SN 2022jli. Outcomes of the observational marketing campaign, revealed September 22 on the pre-print server arXiv, point out that the supernova has uncommon properties.

Basically, supernovae (SNe) are highly effective and luminous stellar explosions. They provide important clues into the evolution of stars and galaxies and are divided by astronomers into two teams based mostly on their atomic spectra: Kind I and Kind II. Kind I SNe lack hydrogen of their spectra, whereas these of Kind II showcase spectral strains of hydrogen.

Kind Ic supernovae (SNe Ic) are a sub-class of core-collapse SNe that exhibit no helium or hydrogen strains of their spectra. They signify the explosions of probably the most stripped large stars, however their progenitors and explosion mechanisms stay unclear.

SN 2022jli was first recognized in Might 2022 by the Kleinkaroo Observatory, as a transient within the galaxy NGC 157. Additional observations of this transient have discovered that it’s an SN Ic at a distance of some 75 million light years.

A bunch of astronomers led by Thomas Moore of the Queen’s College Belfast, UK, has carried out an intensive follow-up observing marketing campaign of SN 2022jli utilizing varied ground-based telescopes and space observatories. The observations cowl the interval from about 50 days earlier than to 200 days after the supernova’s most gentle.

“We’ve got offered detailed, multi-wavelength, excessive cadence observations of the unprecedented Kind Ic SN 2022jli,” the researchers wrote.

The observations discovered that SN 2022jli showcases an unusually long-lived, luminous early extra adopted by a protracted rise time, and gradual spectroscopic evolution. The period of the preliminary extra (not less than 25 days) is unprecedented for a Kind Ic SN and its bolometric gentle curve peaks not less than 59 days after explosion.

The astronomers underlined that the lengthy rise time of SN 2022jli might be as a result of a big ejecta mass. They estimate that the ejecta mass of this supernova is about 12 solar masses, including that additional nebular phase spectroscopy could present an impartial estimate of its core mass.

The researchers additionally detected a periodic habits within the optical gentle curve of SN 2022jli. They measured a interval of roughly 12.5 days and amplitude of about 1 p.c of the supernova most gentle, repeating over a time window of not less than 200 days.

“That is the primary time that repeated periodic oscillations, over many cycles, have been detected in a supernova gentle curve,” the scientist’s famous.

Based on the authors of the paper, such periodicity might be attributed to discrete episodes of shock heating from interplay with a structured circumstellar medium produced via modulated mass-loss of the progenitor star in a binary system. One other situation taken into consideration by the group is a companion-compact object interplay. Additional multi-wavelength monitoring of SN 2022jli is required to seek out out which of those hypotheses is true.

© 2023 Science X Community