Published in Hubble Space Telescope, 2024
We received approval to use the Hubble Space Telescope for four orbits to conduct late-time UV spectral observations of a Tidal Disruption Event, AT2020-afhd, aimed at testing my analytical model predictions.
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Published in MNRAS, 2024
In this paper, we explore the radiative transfer postprocessing of a 2D accretion flow geometry, moving beyond the 1D spherical case. Our findings indicate that photons in 2D are less likely to become trapped, allowing them to escape more readily along low-opacity viewing angles. This results in increased optical luminosity for small viewing angles, aligning more closely with observational data. Additionally, we observe that the evolution of optical-to-X-ray luminosity still varies with the viewing angle.
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Published in Astrophysical Journal Letter, 2024
When the gas falls rapidly into the black hole, fast and dense winds are launched. Such dense winds have cone-like structures that will reflect the X-ray light. Due to the relatively narrow half-opening angle, the light often undergoes multiple reflections across the wind cone-like wind before escaping to the observer. This picture is very different from the standard reflection of a geometrically thin disk. In this paper, we investigate the importance of accounting for multiple reflections in the X-ray spectrum and how we can tell them apart from the standard geometrically thin disk.
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Published in Hong Kong University Library, 2023
This is my PhD dissertation, it contains an introduction, method, result and conclusion section. The result sections are slightly modified versions of my three first-author published papers
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Published in Nature Astronomy, 2022
In this paper, we present the first observed polarization data of TDEs and find the line polarisation levels are in agreement with an axis-symmetric thick envelope of free electrons extending 1000s of gravitational radii. I am the fifth author of this paper.
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Published in Astrophysical Journal Letter, 2022
We carry out the first dynamical prediction of TDEs based on state-of-the-art GRRMHD simulations. The observed temperature, luminosity, optical to X-ray luminosity ratio, and radius of various TDEs fall within the predicted range of our model and to first order the evolution of these parameters are consistent with the model as well.
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Published in Astrophysical Journal, 2022
In this paper, we investigate the theoretical X-ray reverberation signal produced in a super-Eddington accretion setting and compare it to the standard thin disk. We also show an X-ray reverberation on a super-Eddington geometry explains the observation of the jetted TDE, Swift J1644+57, better than the disk. .
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Published in Astrophysical Journal Letter, 2019
In this paper, we investigate the X-ray fluorescence signal produced in a super-Eddington disk geometry and compare it to the standard thin disk. We find that the Fe lines produced from a super-Eddington setting are more blueshifted and symmetric than their thin disk counterparts.
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