Early Near-Infrared Excess and Rapid Disk-Corona Evolution in the Tidal Disruption Event 2024aepd
Abstract
We present multi-wavelength observations of the tidal disruption event (TDE) 2024aepd, spanning primarily the first ∼300 days after discovery. A prominent near-infrared (NIR) excess is detected as early as ∼40 days. Its nearly flat power-law spectrum strongly deviates from the Rayleigh-Jeans tail of the UV-optical blackbody. Although a conventional dust-echo origin cannot be completely ruled out, free-free emission from a reprocessing photospheric envelope provides a more plausible explanation. The spectral break between the UV-optical and NIR components shifts to higher frequencies, while the inferred density-profile index remains nearly constant, suggesting evolving reprocessing conditions within a broadly unchanged density structure. In addition, the X-ray spectrum is initially dominated by a thermal disk component accompanied by a hard excess. From ∼178 days onward, the spectrum becomes power-law dominated and subsequently hardens, indicating the rapid emergence and strengthening of a hot corona. These results provide evidence for frequency-dependent reprocessing at early times and for the rapid development of a disk-corona system, placing new constraints on the structure and evolution of the reprocessing layer around supermassive black holes.
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BibTeX
@misc{wu2026early,
title = {{Early Near-Infrared Excess and Rapid Disk-Corona Evolution in the Tidal Disruption Event 2024aepd}},
author = {Yongxin Wu and Yanan Wang and Thomas M. Reynolds and Shuyuan Wei and Shiyan Zhong and Zikun Lin and Megan Newsome and Sebastian Gomez and Iair Arcavi and Panos Charalampopoulos and Chun Chen and Rongfeng Shen and Ning-Chen Sun and David Aguado and Ismael Pérez-Fournon and Frédérick Poidevin and Zhongnan Dong and Niu Li and Weijian Guo and Hu Zou and Jingbo Sun and Nieves Castro-Rodríguez and Antonio Cabrera-Lavers and Ning Jiang and Hengxiao Guo and J. P. Anderson and Tomás E. Müller-Bravo and Seppo Mattila and Claudia P. Gutiérrez and Amit Kumar and G. Pignata and Xiangkun Liu and R. Dastidar and Brajesh Kumar and Xiaowei Liu and Bin Ma and M. Dennefeld and Francesca Onori and Lydia Makrygianni and Mariusz Gromadzki and Xuan Fang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.14696},
eprint = {2607.14696},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.14696},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Early Near-Infrared Excess and Rapid Disk-Corona Evolution in the Tidal Disruption Event 2024aepd
AU - Yongxin Wu
AU - Yanan Wang
AU - Thomas M. Reynolds
AU - Shuyuan Wei
AU - Shiyan Zhong
AU - Zikun Lin
AU - Megan Newsome
AU - Sebastian Gomez
AU - Iair Arcavi
AU - Panos Charalampopoulos
AU - Chun Chen
AU - Rongfeng Shen
AU - Ning-Chen Sun
AU - David Aguado
AU - Ismael Pérez-Fournon
AU - Frédérick Poidevin
AU - Zhongnan Dong
AU - Niu Li
AU - Weijian Guo
AU - Hu Zou
AU - Jingbo Sun
AU - Nieves Castro-Rodríguez
AU - Antonio Cabrera-Lavers
AU - Ning Jiang
AU - Hengxiao Guo
AU - J. P. Anderson
AU - Tomás E. Müller-Bravo
AU - Seppo Mattila
AU - Claudia P. Gutiérrez
AU - Amit Kumar
AU - G. Pignata
AU - Xiangkun Liu
AU - R. Dastidar
AU - Brajesh Kumar
AU - Xiaowei Liu
AU - Bin Ma
AU - M. Dennefeld
AU - Francesca Onori
AU - Lydia Makrygianni
AU - Mariusz Gromadzki
AU - Xuan Fang
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2607.14696
UR - https://arxiv.org/abs/2607.14696
AB - We present multi-wavelength observations of the tidal disruption event (TDE) 2024aepd, spanning primarily the first ∼300 days after discovery. A prominent near-infrared (NIR) excess is detected as early as ∼40 days. Its nearly flat power-law spectrum strongly deviates from the Rayleigh-Jeans tail of the UV-optical blackbody. Although a conventional dust-echo origin cannot be completely ruled out, free-free emission from a reprocessing photospheric envelope provides a more plausible explanation. The spectral break between the UV-optical and NIR components shifts to higher frequencies, while the inferred density-profile index remains nearly constant, suggesting evolving reprocessing conditions within a broadly unchanged density structure. In addition, the X-ray spectrum is initially dominated by a thermal disk component accompanied by a hard excess. From ∼178 days onward, the spectrum becomes power-law dominated and subsequently hardens, indicating the rapid emergence and strengthening of a hot corona. These results provide evidence for frequency-dependent reprocessing at early times and for the rapid development of a disk-corona system, placing new constraints on the structure and evolution of the reprocessing layer around supermassive black holes.
ER -