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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 9.

Ratio of the soft (0.3–10 keV) X-ray luminosity (L_X) to L_UVOIR (shades of orange) and L_NIR (shades of blue; see Section 6) for AT 2024wpp (circles) and AT 2018cow (stars). L_UVOIR is calculated from the blackbody fits (see Figure 5). The shaded yellow (orange) area marks the time of emergence of clear spectral features with widths of a few × 10³ km s^–1 in AT 2018cow (AT 2024wpp). Interestingly, for both events this happens for L_X ≈ L_UVOIR. This plot also shows that L_X/L_NIR ≈ constant with time for AT 2018cow and that the parameters of AT 2024wpp are consistent with the same value. AT 2018cow data from R. Margutti et al. (2019); AT 2024wpp L_X data from Paper II.

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