2026-10-09T22:20:39Z https://api.figshare.com/v2/oai

oai:figshare.com:article/32826158 2026-10-01T16:10:26Z portal_1172 item_type_8 month_year_10_2026

Exploring the diversity of Type Ibc supernovae with ATLAS Thomas Moore (1312581) PUREID: 660483588 supernovae Type Ib and Type Ic supernovae are astrophysical transients resulting from the core collapse of envelope-stripped progenitor stars. Their evolution contributes substantially to kinetic, chemical, and radiative feedback, shaping their galactic environments. Throughout this thesis, I present spectrophotometric observations and modelling to investigate the properties and improve our understanding of Type Ibc supernovae. To date, only a single supernova has been shown to have periodic signals in its optical light curve: SN 2022jli. In this thesis, I present the discovery and detailed spectrophotometric follow-up observations of this first-of-a-kind supernova. I consider a range of plausible explanations, including interaction between the nascent neutron star and a companion, ultimately favouring interaction of the SN ejecta with nested dust shells. SN 2022jli represents the strongest evidence to date for a binary origin of a Type Ic supernova. I present detailed observations of SN 2023zaw, a member of the emerging ultra-stripped class of supernovae. These SNe have low ejecta masses, originating from progenitor stars stripped by a neutron star companion. I compare filtered photometry and (pseudo-)bolometric luminosities with a suite of models, finding evidence from the light curves of SN 2023zaw for the need for an additional, non-radioactive heating mechanism. Finally, expanding the scope to study the whole population, I have collated and analysed the largest systematic sample study of Type Ibc supernovae (N = 212 events). This analysis includes every SN Ibc discovered within a roughly seven-year time window and detected by the ATLAS survey. Our analysis shows, that in a magnitude-limited regime, many SN Ibc exceed the theoretical upper limit on the luminosity. However, this discrepancy disappears in a volume-limited comparison (d < 100Mpc), suggesting that selection effects are important in this comparison. Within the sample, I identify a new ultra-stripped supernova, SN 2020ksa, discovered in the archival data. 2026-10-01T16:10:26Z Text Thesis 10.17034/32826158.v1 https://figshare.com/articles/thesis/Exploring_the_diversity_of_Type_Ibc_supernovae_with_ATLAS/32826158 All Rights Reserved