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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 7.

Evolution of the Hα line in AT 2024wpp (left) and CSS161010 (right; C. P. Gutiérrez et al. 2024), the two LFBOTs with evidence for blueshifted emission. The v = 0 km s⁻¹ component in CSS161010’s spectrum is narrow host galaxy emission. In AT 2024wpp, the component is broader (FWHM ≈ 2000 km s⁻¹, similar to the blueshifted component; see Figure 11); thus, we identify it as a transient emission feature. The lightly shaded spectra indicate native binning.

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