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The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the Ultraviolet to the Near-infrared

Authors: Natalie LeBaron, Raffaella Margutti, Ryan Chornock, Nayana A. J., Olivia Aspegren, Wenbin Lu, Brian D. Metzger, Daniel Kasen, Thomas G. Brink, Sergio Campana, Paolo D'Avanzo, Jakob T. Faber, Matteo Ferro, Alexei V. Filippenko, Ryan J. Foley, Xinze Guo, Erica Hammerstein, Saurabh W. Jha, Charles D. Kilpatrick, Giulia Migliori, Dan Milisavljevic, Kishore C. Patra, Huei Sears, Jonathan J. Swift, Samaporn Tinyanont, Vikram Ravi, Yuhan Yao, Kate D. Alexander, Prasiddha Arunachalam, Edo Berger, Joe S. Bright, Chuck Cynamon, Kyle W. Davis, Braden Garretson, Puragra Guhathakurta, Wynn V. Jacobson-Galán, D. O. Jones, Ravjit Kaur, Stefan Kimura, Tanmoy Laskar, Morgan Nuñez, Michaela Schwab, Monika D. Soraisam, Nao Suzuki, Kirsty Taggart, Eli Wiston, Yi Yang, WeiKang Zheng

Natalie LeBaron et al 2026 The Astrophysical Journal Letters 997 .

Provider: AAS Journals

Caption: Figure 3.

Left: AT 2024wpp NIR spectral series from +10.0 to +24.2 days after t₀. Spectra are plotted in the rest frame and are binned and scaled for clarity (for reference, the native binning is shown for the +24.2-day spectrum in lighter shading). For comparison, a +16.6-day spectrum of AT 2018cow (R. Margutti et al. 2019), the only other LFBOT with NIR spectra, is plotted. In contrast to the AT 2018cow spectrum, the AT 2024wpp spectra show no signs of He feature development by day 24. Right: zoom-in on the 1.08 μm He I feature.

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