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2026.10.15
TBD
Host: Dongzi L
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2026.10.08
Qi Guo's talk
Host: Cheng Zha
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2026.09.24
Reassessing Chemical Processes Defining the Isotopic Compositions of the First Solids in the Solar System
The first solids formed in the Solar System record an unusual oxygen isotope signature that is distinct from that of Earth. Their 17O/16O and 18O/16O variations follow a nearly one-to-one relationship, rather than the relationship expected from conventional mass-dependent isotope fractionation. This mass-independent signature provides an important constraint on the physical and chemical environ...
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2026.09.17
How do you form a solar system like ours?
Our solar system makes it seem like the planets were formed in a nice, ordered disc. But dig a little deeper and there are hints that things are not quite as neat as they seem — spins do not align, dust appears to have been violently melted and the planetesimal disc remains sharply truncated at 47 au. The last 10 years has brought us spectacular observations of planet formation `in action’ in...
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2026.06.04
Galaxy-dark matter connection星系-暗物质关联
Galaxies form within the cosmic web dominated by dark matter. Investigating and establishing the connection between galaxies and dark matter is crucial for research in cosmology, large-scale structure, and galaxy formation. In this talk, I will present our recent studies in this area. On large scales, we have developed a set of methods that can reconstruct the initial conditions of the dark mat...
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2026.05.28
Orbital Architecture of Planetary Systems Formed by Gravitational Scattering and Collisions
In the standard formation models of terrestrial planets in the solar system and close-in super-Earths recently discovered by exoplanet observations, planets are formed by giant impacts of protoplanets or planetary embryos after the dispersal of protoplanetary disk gas in the final stage. This study aims to clarify a fundamental scaling law for the orbital architecture of planetary systems forme...
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2026.05.21
From Flares to Feedback: The Multi-Scale Lives of Supermassive Black Holes
This talk will first briefly introduce active galactic nuclei (AGNs), followed by a presentation of seven recent studies on tidal disruption events (TDEs), AGN quasi-periodic oscillations (QPOs), and AGN feedback: (1) Identification of a candidate intermediate-mass black hole TDE through comprehensive multi-wavelength observational analysis; (2) Discovery of a possible supermassive black hole b...
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2026.05.14
AGN Feedback Across Scales using MACER: From Cooling Flows to X-ray Profiles
AGN feedback is widely invoked to regulate hot gas in galaxies and clusters, yet most existing models remain phenomenological and lack predictive power. I will present results from the MACER framework, a physically grounded model that self-consistently links black hole accretion to radiative and mechanical feedback. Across both cluster and galactic scales, MACER achieves predictive, parameter-f...
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2026.05.07
Searching for Wandering Worlds -- Discovering Isolated Black Holes and Free-Floating Planets with Microlensing
Galactic microlensing is the only known method for detecting dark objects ranging from isolated stellar-mass black holes (BHs) to low-mass free-floating planets (FFPs). Our success in the interferometric resolution of microlensed images with the VLTI has opened a new avenue for identifying isolated stellar remnants. I will discuss how VLTI-GRAVITY+ can potentially discover a large sample of BHs...
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2026.04.23
Closeby Habitable Exoplanet Survey (CHES): An Astrometry Mission to Explore Nearby Habitable Worlds
The detection and study of potentially habitable exoplanets is a cutting-edge topic in contemporary astronomy. The National Medium- and Long-Term Development Plan for Space Science (2024–2050) has been officially released, identifying “Nearby Habitable Exoplanets” as one of its key scientific frontiers. The Closeby Habitable Exoplanet Survey (CHES) (http://www.ps.pmo.cas.cn/CHES/)) aims to s...
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