SN 2024jlc: Bridging the Gap Between Supernova Classes

In this episode, we dive into the fascinating discovery of SN 2024jlc, one of the closest and least luminous super-luminous supernovae (SLSNe) ever found. We explore how this extraordinary event is challenging our understanding of stellar explosions by serving as a "bridge" between classic stripped-envelope supernovae (SE-SNe) and their super-luminous cousins. We unpack the massive multi-wavelength campaign used to study it—spanning from ultraviolet and optical light to X-rays and even high-energy gamma-rays.

Key Topics Covered:

• Defying Classification: Why SN 2024jlc's exceptionally low peak luminosity and rare helium signatures make it a unique SLSN-Ib, defying standard stellar explosion models.
• The Powering Engine Debate: What is driving this massive explosion? We discuss the two leading theories: the radioactive decay and interaction with a circumstellar medium (CSM) versus the spin-down of a rapidly rotating young magnetar.
• Whispers of Gamma-Rays: We look at the intriguing, tentative hint of a gamma-ray signal picked up by the Fermi-LAT space telescope, and what it might mean for the hidden central engine powering the supernova.

The Future of Supernova Hunting: How upcoming surveys like the Vera C. Rubin Observatory's LSST will help uncover more of these "missing link" transitional objects in the cosmos.

Article Reference Discussed in this Episode:

Simongini, A., et al. (2026). Bridging the gap between SLSNe and SE-SNe: Multi-wavelength analysis of the SLSN-Ib SN 2024jlc. Astronomy & Astrophysics.

Acknowledements: Podcast prepared with Google/NotebookLM. Illustration credits: NASA