尘埃遮蔽爆发事件红外回响的光变曲线分析

超大质量黑洞吸积相关的能量爆发事件可能被周围尘埃遮蔽而无法被直接观测。爆发事件的紫外光学辐射加热核区尘埃产生的红外回响信号，包含了爆发事件本身性质的信息，提供了探究尘埃分布和物理性质的绝佳机会。本项目拟发展新的尘埃辐射转移模型，用以分析爆发事件红外回响的高质量光变曲线数据，并重点开展以下研究：(1)现有潮汐撕裂恒星事件（TDE）的统计研究遗漏了尘埃遮蔽TDE。本项目将借助红外回响模型，从红外光变曲线中反推遮蔽TDE的紫外光学辐射性质，区分爆发事件类型，构建遮蔽TDE的紫外光学光度函数，实现对TDE的无偏普查。(2)观测发现活动星系核存在极向尘埃，但其分布性质和起源仍不清楚。本项目以活动星系核区爆发事件为切入点，利用尘埃环外区对内区的几何遮挡，探测极向尘埃的回响信号，借助光旅行时间效应探究pc尺度极向尘埃的分布和物理性质，深入理解活动星系核pc尺度不同方向的尘埃遮蔽效应。

Transient outburst events related with the accretion of supermassive black holes (SMBH) can be obscured by surrounding dust and cannot be directly detected. The UV-optical radiation can from these events can heat the surrounding dust and hence produce infrared echoes, which provide opportunities to explore the nature of dust obscured outburst events, or to measure the distribution and properties of dust around the SMBH. In this project, I will developed the radiation transfer model for infrared echoes. Using the model, I will study the high-quality light-curve data of infrared echoes of outburst events, and study on the following two topics. (1) Statistical studies on tidal disruption events (TDE) ignored those events that are obscured by dust. I will analyze the multi-band light curves of infrared selected TDE candidates, infer the unknown properties of UV-optical radiation, distinguish possible origins of these events, calculate the luminosity function of obscured TDE, and finally calculate the unbiased luminosity function of TDE. (2) Dust exists at pc-scale in the polar region in the active galactic nuclei (AGN). The distribution and the origin of this polar dust are not clear. To probe the polar dust, I will begin with studying the infrared echoes of outburst events in AGN, because the infrared echo from the polar dust can be clearly detected as the inner region of the dusty torus may be obscured by the outer region. By Analyzing the light curves of these infrared echoes, I can infer the distribution and physical conditions of the polar dust. These will finally help understand the obscuring effect in different directions by dust at pc-scale.