Multiwavelength Modelling of the Luminous Fast Blue Optical Transient AT2024wpp

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ID: 317084
2026
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Abstract
Abstract Luminous fast blue optical transients (LFBOTs) are a growing class of enigmatic energetic transients. They show fast rises and declines, high temperatures throughout their evolution, and non-thermal emission in radio and X-rays. Their power source is currently unknown, but proposed models include engine-driven supernovae, interaction-powered supernovae, shock cooling emission, intermediate mass black hole tidal disruption events (IMBH TDEs), and Wolf-Rayet/black hole mergers, among others. AT2024wpp is the most optically luminous LFBOT to date and has been observed extensively at multiple wavelengths, including radio, optical, UV, and X-rays. We take models from multiple scenarios and fit them to the AT2024wpp optical, radio, and X-ray light curves to determine which of these scenarios can best describe all aspects of the data. We show that none of the multiwavelength light curve models can reasonably explain the data, and that other physical arguments disfavour models with homologously expanding ejecta. We discuss how a stellar mass/IMBH TDE of a low mass star can be tested with late-time observations, and what other scenarios could possibly explain the broadband data.
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Authors Conor M. B. Omand, Nikhil Sarin, Gavin P. Lamb, D. A. Perley, Andrew Mummery, Hamid Hamidani, Steve Schulze, Emma R. Beasor, Aleksandra Bochenek, Helena-Margaret S. Grabham, Sorcha R Kennelly, Nguyen M. Khang, S. Kobayashi, Genevieve Schroeder, William N. Stone, Cairns Turnbull, Jacob Wise
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1104
URL
https://doi.org/10.1093/mnras/stag1104
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