Bridging the gap between SLSNe and SE-SNe. Multiwavelength analysis of the SLSN-Ib SN 2024jlc

Simongini, A, Acero, F, Imbrogno, M, Wise, JL ORCID: 0000-0003-0733-2916, Sollerman, J, Schulze, S, Kuin, NPM, Chen, TX, Fremling, C, Gangopadhyay, A, Kasliwal, MM, Laher, RR, McGrath, Z, Perley, DA ORCID: 0000-0001-8472-1996, Purdum, JN, Rehemtulla, N, Rich, RM and Riddle, R (2026) Bridging the gap between SLSNe and SE-SNe. Multiwavelength analysis of the SLSN-Ib SN 2024jlc. Astronomy & Astrophysics, 713. pp. 1-18. ISSN 0004-6361

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Abstract

The Type I super-luminous supernova SN 2024jlc (ZTF24aapadbb) exploded on 25 May 2024 at z = 0.039. This was the closest supernova of this class discovered in recent years and one of the closest ever. It therefore represented a rare opportunity to study this type of object in detail. We performed a multiwavelength analysis that spanned ten orders of magnitude in frequency and included optical and UV photometry and spectroscopy, soft and hard X-rays, and high-energy γ-rays. We characterized the event as a slow-evolving and He-rich supernova, with one of the lowest peak luminosities reported for a super-luminous event M_g∼-19.37 mag, and a light-curve evolution compatible with either a circumstellar interaction and a magnetar spin-down model, with noticeable contribution from 56 Ni decay. No significant excess was found in the soft and hard X-ray bands, for which we provide upper limits on the flux. Additionally, we analyzed two years of -LAT data, from which we report an intriguing hint of a γ-ray signal at the ∼ 3.6 σ level, although no firm detection can be claimed. The ratio of gamma to optical efficiency, η = 0.38, suggests a central-engine scenario, similar to SN 2017egm. Our analysis suggests that SN 2024jlc might bridge the gap between super-luminous supernovae and classical stripped-envelope supernovae. While still poorly populated, this bridge might consist of all super-luminous Ib supernovae, with the key difference residing in the powering mechanism. Fermi

Item Type:	Article
Uncontrolled Keywords:	5101 Astronomical Sciences; 51 Physical Sciences; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5107 Particle and high energy physics; 5109 Space sciences
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	EDP Sciences
Date of acceptance:	28 July 2026
Date of first compliant Open Access:	28 September 2026
Date Deposited:	28 Sep 2026 14:11
Last Modified:	28 Sep 2026 14:11
DOI or ID number:	10.1051/0004-6361/202659680
URI:	https://researchonline.ljmu.ac.uk/id/eprint/29545

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