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2024.05.24

Cracking neutron star mysteries: Physics-driven insights into interior, surface, and exterior by X-ray Timing results

<p>The utilization of Pulse Profile modeling techniques could simultaneously provide measurements for Neutron star Mass Radius and offer insights into their hotspot distribution. Presently, these methodologies rely on meta models of the equation of state (EOS) and employ pure geometrical cap overlapping techniques to align with observational data. This presentation aims to showcase our recent resu...</p>

2024.07.08

Damping Obliquities of Hot Jupiter Hosts by Resonance Locking

<p>When orbiting hotter stars, hot Jupiters are often highly inclined relative to their host star equator planes. By contrast, hot Jupiters orbiting cooler stars are more aligned. Prior attempts to explain this correlation between stellar obliquity and effective temperature have proven problematic. We show how resonance locking—the coupling of the planet&#39;s orbit to a stellar gravity mode (g-mode)...</p>

2024.06.03

Planet Formation near the Inner Disk Edge

<p>Short-period super-Earths and sub-Neptunes are the most abundant type of planets. Their origin is key to understanding planet formation and the evolution of protoplanetary disks. Recent observations found that, contrary to mature systems, young planetary systems appear to be dominated by near-resonant configurations, suggesting a rich history of resonance capture followed by secular dynamical i...</p>

2024.05.17

Portable Fantacies: How to Work with Android-like Devices

<p>Over the past few years, the computing capability of portable devices equipped with ARM processors has expanded exponentially. Yet, despite their growing power, the prevalent Android-like operating systems often confine users to a &#39;walled garden,&#39; restricting direct interaction with the core Linux functionalities. In this presentation, we will explore the transformative potential of Termux and ...</p>

2024.05.10

Biases and uncertainties in quantifying morphology of galaxies at high redshifts with JWST

<p>Observations of high-redshift galaxies with unprecedented detail have now been rendered possible with JWST. However, accurately quantifying their morphology remains uncertain due to potential biases and uncertainties. To address this issue, I used a sample of 1816 nearby DESI galaxies to compute artificial images of galaxies of the same mass located at high redshifts and observed at rest-frame ...</p>

2024.05.14

Gravitational radiation from oscillations of ultracompact stars

<p>By analytically solving the Teukolsky gravitational&nbsp;wave equation for the spacetime of an ultracompact star of constant density, we derive exact and simple formulae that completely describe&nbsp;weakly damped oscillations trapped inside such stars. No similar&nbsp;complete analytic solution was known before, despite several attempts&nbsp;to find it. Our solution is cast in terms of the quasi normal modes&nbsp;of o...</p>

2024.05.08

Dark Matter Halo and its Structure, Assembly, and Clustering

<p>Dark matter halos are the major composition of the cosmic structures in our Universe and, therefore, play a central role in studying galaxies and cosmology. In cosmological N-body simulations, dark matter halos can be investigated from three perspectives: their structures, assembly histories, and spatial clustering. This talk will focus on our recent work on this topic. In the first part, I wil...</p>

2024.04.26

Research on the Structure, Chemistry and Kinematics of the Milky Way Based on the Large-scale Sky Surveys

<p>With the advent of massive large-scale sky surveys, such as, the SDSS for photometry, the LAMOST for spectroscopy, and Gaia for astrometry, we are entering a golden era of Galactic studies and precise multi-dimensional information (e.g., 3D position, 3D velocity, chemical element abundance ratios, and stellar age) is now available for some huge samples of stars in the Milky Way. Leveraging thes...</p>

2024.04.23

Gas Accretion and AGN Feedback in the Late Stage Evolution of Massive Ellipticals

<p>Observations indicate that massive elliptical galaxies in the contemporary universe exhibit both low star formation rates and low AGN luminosity. This raises a question: Given continuous gas accretion, how do these massive ellipticals maintain their quiescent state? SMBH feedback is a widely accepted solution to this issue, yet the mechanisms how it prevents gas accretion and subsequent star fo...</p>

2024.04.24

Evolutionary Mechanisms in nearby galaxies: Insights from Statistical Analysis of Observations and Cosmological Simulations

<p>Galaxies are complex systems influenced by numerous factors. Despite extensive research, we cannot yet explain the diverse properties of nearby galaxies. Gas accretion, environments, galaxy merging, and supermassive black hole (SMBH) feedback play pivotal roles in galaxy evolution. In this talk, I will present an overview of my recent and current research. My work entails a comprehensive compar...</p>