发表机构
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences; School of Astronomy and Space Sciences, University of Chinese Academy of Sciences; Tuorla observatory, Department of Physics and Astronomy, University of Turku; Cosmic Dawn Center (DAWN); Niels Bohr Institute, University of Copenhagen; South-Western Institute for Astronomy Research, Yunnan University; Department of Astronomy, Xiamen University; Department of Astronomy, The University of Texas at Austin; The School of Physics and Astronomy, Te（中国科学院国家天文台光学天文重点实验室; 中国科学院大学天文与空间科学学院; 图尔库大学物理与天文学系图奥拉天文台; 宇宙黎明中心; 哥本哈根大学尼尔斯·玻尔研究所; 云南大学西南天文研究所; 厦门大学天文学系; 德克萨斯大学奥斯汀分校天文学系; 物理学与天文学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究潮汐瓦解事件2024aepd多波长观测，发现其X射线光谱和近红外过剩随时间变化，用自由-自由发射解释近红外过剩，该事件是第三个早期有近红外过剩的TDE，需更多样本确定此现象是否普遍。
AI 中文摘要
我们展示了潮汐瓦解事件（TDE）2024aepd的多波长观测结果，主要涵盖发现后的约300天。X射线光谱最初由热盘成分主导并伴有硬过剩。从约178天起，光谱变为幂律主导并随后变硬，表明热冕快速出现并增强。早在约40天就检测到显著的近红外（NIR）过剩，其近乎平坦的幂律光谱强烈偏离紫外-光学黑体的瑞利-金斯尾。虽然不能完全排除传统尘埃回声起源，但来自再处理光球包层的自由-自由发射提供了更合理的解释。此外，随着密度剖面指数几乎保持不变，紫外-光学到近红外的断点向更高频率移动，这意味着在大致不变的密度结构内再处理条件在演变。TDE 2024aepd与AT2019azh和TDE 2025abcr一起，是第三个被报道在早期表现出近红外过剩的TDE。需要更大的具有早期近红外覆盖的样本，以确定这种过剩在TDE中是否常见。
英文摘要
We present multi-wavelength observations of the tidal disruption event (TDE) 2024aepd, spanning primarily the first $\sim$300 days after discovery. A prominent near-infrared (NIR) excess is detected as early as $\sim$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 $\sim$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.
CommentsAccepted for publication in Research in Astronomy and Astrophysics (RAA)
