SN 2022jli

[2] SN 2022jli was discovered by astronomer Libert Monard [it] at Kleinkaroo Observatory, who reported it to the Transient Name Server (TNS) on May 5, 2022, as AT 2022jli.

This repeating pattern of oscillations is observed across multiple filters and instruments over many cycles, the first unambiguous detection of periodicity in a supernova light curve.

The total rise time to maximum brightness is ≥59 days, much longer than typical for stripped-envelope core-collapse supernovae.

Spectra show features typical of Type Ic supernovae, with iron, calcium and sodium P Cygni profiles.

The source of the early excess and periodic oscillations is uncertain, but plausible explanations include interaction of the ejecta with circumstellar material or a binary companion star.

Top: multicolor extinction-corrected light curves of SN 2022jli including photometric errors. Black lines along the bottom of the plot indicate spectroscopic observations. Open symbols are synthetic photometry performed on the EFOSC2 spectrum. Bottom: light curves after detrending with a second-degree polynomial fit including only the region after maximum light (vertical dashed line). [ 3 ]