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2026.03.11
Simulating Accretion and Early Light Curve in Tidal Disruption Event (TDE)
The tidal disruption of a star by a supermassive black hole and consequent accretion can lead to a transient electromagnetic flare in multiple bands. However, the origin of the detected emission from such tidal disruption events (TDEs) remains an open question. In this talk, I will discuss the potential emission mechanisms in TDEs during accretion disk formation, implied by series of 3D radiati...
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2026.03.10
Cosmic Dance: Angular Momentum Transfer from Large-scale to Small-scale
Angular momentum is a key quantity linking the formation of galaxies to the dynamics of the cosmic web. Building on a series of recent observational and theoretical works, this talk will present a picture of how angular momentum is generated, transported and reprocessedacross scales—from megaparsec-scale filaments, through galaxy clusters, down to individual galaxies. I will first show how lar...
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2026.03.02
An All-Sky 3D Extinction-Curve Map of the Milky Way: Insights into Interstellar Organics
I present the first three-dimensional (3D), full-sky dust map that reveals variations in the extinction curve, parameterized by R(V). Using Gaia XP spectra, we measure extinction curves for over 130 million stars—more than two orders of magnitude more than previously available—enabling us to trace dust properties across the Milky Way with unprecedented detail. Surprisingly, trends in this map...
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2026.03.04
A Trapezium-like OB cluster in the making
The Trapezium Cluster in Orion teaches us that massive stars often form together in compact systems—but how such dense OB groupings are assembled remains an open question. In this talk, I will present high-resolution observations with the Atacama Large Millimeter/submillimeter Array (ALMA) that reveal an exceptionally young, deeply embedded massive quadruple OB system in the making. The four m...
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2026.01.06
CPUs to GPUs: Transforming Star Formation Simulations with QUOKKA
the past two decades, large-scale numerical simulations on parallel CPU clusters have been crucial for our theoretical understanding of star formation and stellar feedback. As modern supercomputers increasingly pivot toward GPU-dominated architectures, it has become essential to redesign our simulation tools to this new architecture in order to scale up these simulations. In this talk, I will g...
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2026.01.07
Variations of the Stellar Mass Function in the Milky Way Halo
I will show that the low-mass stellar mass function in the Milky Way halo using a clean sample of metal-poor main-sequence stars from Gaia DR3 BP/RP (XP) spectra within 1 kpc. Combining probabilistic kinematic halo selection with XP-based [Fe/H] calibrated to SDSS-V/APOGEE, and a forward model with effective volumes, we find that below 0.5 solar mass the halo MF changes strongly with metallicit...
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2026.01.07
DESI cosmology review
The Dark Energy Spectroscopic Instrument (DESI) has constructed the largest 3D map of galaxies and quasars to date, spanning the nearby Universe to a redshift of over 3. Recently, DESI has released cosmological measurements from its third-year (Y3) data, revealing evidences of dynamic dark energy. In this talk, I will review the DESI results, discuss potential problems and future developments.H...
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2025.12.23
The non-thermal physics of cosmic rays and magnetic fields in galaxy formation and evolution
Notoriously difficult to constrain with observations and physically intricate to model in simulations, the non-thermal physics of cosmic rays (CRs) and magnetic fields (B-fields), and their effects on galaxies, remain mostly elusive. The study of these processes is timely and scientifically exigent. Current simulations are able to evolve CRs with magnetic fields in tandem with feedback from sta...
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2025.12.19
主流极低温制冷技术及其典型应用
随着量子技术的兴起以及天文观测等前沿研究的进一步深入，对于极低温技术的需求愈加旺盛。目前主要应用集中在20mK-300mK制冷温区，冷量大小在数μW至数百μW量级。主流的极低温制冷机包括吸附制冷机（250mK-1K）、绝热去磁制冷机(>30mK)以及稀释制冷机（>5mK）。本报告主要介绍三种极低温制冷技术以及近年来相关领域的代表性进展，同时介绍极低温技术的典型应用，并对未来技术发展趋势做一些初步探讨。报告人简介：戴巍，中国科...
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2025.12.19
Disk Population Synthesis of structured disks with external photoevaporation
With the ever-increasing census of protoplanetary disks observed in mm emission, disk population synthesis studies have become an important tool to constrain expected disk properties and the occurrence of sub-structures. Previous studies have revealed that the observed spectral indices are consistent with ubiquitous substructures emerging at early times. However, it still remains challenging to...
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