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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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2026.01.15
Physical and Chemical Conditions of Planetary Birth Environments
Observational and theoretical studies of exoplanets have matured substantially since the discovery of the first planets outside our Solar System. We now know of thousands of such planets, and together with those in our Solar System, they show a vast diversity in their types, compositions, and orbital characteristics. Understanding this diversity requires understanding where planets form and evo...
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2026.01.12
Probing Stellar Interiors in the Golden Era of Precision Stellar Astrophysics
Since 2010, pioneering time-domain photometric missions (CoRoT, Kepler, and TESS) together with extreme-precision radial-velocity instruments (VLT/ESPRESSO and Keck/KPF), have revealed a rich spectrum of low-amplitude stellar variability driven by rotation, convection, and oscillations. Among these phenomena, stellar oscillations provide a powerful probe of stellar interiors, enabling unique in...
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2026.01.08
A New Era in Extragalactic Astrophysics with JWST NIRCam Wide Field Slitless Spectroscopy
The James Webb Space Telescope (JWST) has transformed our view of galaxy formation in the early Universe. One of its most powerful capabilities is NIRCam wide-field slitless spectroscopy (WFSS). Originally designed as an engineering mode, NIRCam WFSS has evolved into a discovery machine that delivers tens of thousands of spectroscopic redshifts from z=0 to 9. This provides a highly complete and...
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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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2026.01.05
An X-ray View of Active Galactic Nuclei
Active galactic nuclei (AGN) are powered by accretion onto supermassive black holes (SMBHs) and play a central role in galaxy evolution by tracing SMBH growth across cosmic time. As some of the most luminous objects in the Universe, AGN provide unique laboratories for studying accretion physics and relativistic processes in extreme environments. However, the extremely small physical scales of t...
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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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