The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the X-Rays and Radio
A. J. Nayana; R. Margutti; Eli Wiston; T. Laskar; Giulia Migliori; R. Chornock; Timothy J. Galvin; Natalie LeBaron · 2025 · The Astrophysical Journal Letters
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Abstract
Abstract We present X-ray (0.3–79 keV) and radio (0.25–203 GHz) observations of the most luminous fast blue optical transient (LFBOT) AT 2024wpp at z = 0.0868, spanning 2–280 days after first light. AT 2024wpp shows luminous ( L X ≈ 1.5 × 10 43 erg s −1 ), variable X-ray emission with a Compton hump peaking at δt ≈ 50 days. The X-ray spectrum evolves from a soft ( F ν ∝ ν −0.6 ) to an extremely hard state ( F ν ∝ ν 1.26 ) accompanied by a rebrightening at δt ≈ 50 days. The X-ray emission properties favor an embedded high-energy source shining through asymmetric expanding ejecta. We detect radi
Abstract by A. J. Nayana; R. Margutti; Eli Wiston; T. Laskar; Giulia Migliori; R. Chornock; Timothy J. Galvin; Natalie LeBaron, The Astrophysical Journal Letters (2025) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.3847/2041-8213/ae0b4d