Orateur
Description
In this contribution, I will present a comprehensive multiwavelength study of SN 2024jlc, a superluminous supernova (SLSN) that exploded on 2024 May 25 at a redshift of z = 0.039. With a peak g-band absolute magnitude of only −19.38 mag, it is among the least luminous SLSNe ever discovered. As one of the nearest SLSNe exploded in recent years, and among the closest ever observed, SN 2024jlc provided a unique opportunity to investigate the diversity of this class through an extensive multiwavelength campaign. Our analysis combines optical and UV photometry and spectroscopy with observations in soft and hard X-rays, as well as high-energy gamma-rays. We investigate the physical mechanisms powering the light curve, constrain the properties of the circumstellar environment, and explore the similarities and differences between SN 2024jlc and stripped-envelope supernovae (SE-SNe). Our results suggest that SN 2024jlc bridges the gap between SLSN-I and broad-light-curve SE-SNe. Its emission can be explained by either ejecta–circumstellar medium interaction or magnetar spin-down, with a significant contribution from radioactive nickel decay. We also report a suggestive 3.6σ hint of gamma-ray emission, representing the most significant evidence for gamma-ray emission from a SLSN since the confirmed detection of SN 2017egm. I will discuss the implications of this result for the powering mechanism of SLSNe and the prospects for future gamma-ray observations of these remarkable transients.