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2024.10.31

Current and future characterization of small exoplanet atmospheres from ground and space

<p>Planets between the size of Earth and Neptune, also known as sub-Neptunes, pose a conundrum. They are absent in the solar system, but more than half of all Sun-like stars in the Galaxy host a sub-Neptune interior to 1 au. Although the number of sub-Neptunes atmospheres probed so far has been very low, a major breakthrough in exo-atmospheres science is happening right now thanks to the increased...</p>

2024.10.24

Stellar physics and population in the open cluster lab (英文报告)

<p>Open clusters provide an ideal laboratory for testing and calibrating our understanding of stellar physics and single stellar population. In this talk, I will discuss how astronomers use open clusters as a well-defined single population of stars to study the Milky Way disk and stellar evolution. Additionally, I will explore how open clusters can be used to validate pipeline results from large p...</p>

2024.10.17

Hypervelocity stars: energetic guys “kissed” by massive black holes

<p>The so-called Hypervelocity stars (HVSs; with velocities even greater than 1000 km/s) were first predicted from the theoretical arguments of Hills (1988), and attributed to be the result of tidal interaction between a close stellar binary system and a supermassive black hole (SMBH) in the Galactic center, commonly referred to as the “Hills mechanism”. HVSs or High-Velocity stars (HiVels) can ...</p>

2024.09.26

Quest for the origin of neutrinos

<p>The discovery of neutrino oscillation established a non-zero mass of neutrino. &nbsp;The origin of neutrino and its non-zero mass is an one of the most important experimental clues to the new physics beyond the standard model. &nbsp;Neutrinos are ubiquitous in the universe, accompanying most of the weak-interacting physics processes. I shall review natural and artificial sources of neutrinos with an emph...</p>

2024.09.19

Dynamic and Untamed: the early life of circumstellar disks

<p>Circumstellar disks as young as 0.5 Myr bear gaps and rings as tentative planet signposts, which aligns with accumulating evidence of early planet formation. However, such young disks are poorly understood both observationally and theoretically. They are likely affected by the star formation environment becoming warped or eccentric. The disk flow can become peculiar, and various instabilities f...</p>

2024.09.12

Supermassive black holes in the Universe

<p>Supermassive black holes are extensively discussed in this talk:&nbsp;1) cosmic evolution of SMBHs;&nbsp;2) masses and spins;&nbsp;3) SMBH binaries and nano-Hz gravitational waves;&nbsp;4) Satellite black holes around SMBH;&nbsp;5) new opportunity of SMBH research in the JWST and VLTI era.BIOJianming Wang is astrophysics professor in IHEP. He got PhD in USTC in 1995 and originally from National University of Defense Te...</p>

2024.08.19

Beyond Summary Statistics: Leveraging Generative Models for Field-Level Weak Lensing Analysis

<p>Current and future weak lensing surveys contain significant information about our universe. However, their optimal cosmological analysis is challenging, with traditional analyses often resulting in information loss due to reliance on summary statistics like two-point functions. While deep learning methods offer promise in capturing the complex non-linear features of these cosmological fields, t...</p>

2024.08.23

Role of dark matter halo angular momentum distribution on bar formation, evolution and dynamical friction

<p>In this study, we investigated the role of the inner halo&#39;s angular momentum distribution on bar formation and evolution processes. We performed a series of high-resolution N-body experiments with Milky Way-type disk galaxies. These models were initiated with similar disks but with varying inner halo angular momentum in the surrounding dark matter halo. The bar triggered earlier in the model wi...</p>

2024.08.16

Unveiling the Milky Way Dust Extinction Curve in 3D

<p>Despite the vital importance of interstellar dust to many areas of astronomy, its composition and properties are highly uncertain. The dust extinction curve (the relation of extinction vs. wavelength) depends on both the grain-size distribution and the chemistry of the dust, and is therefore a probe of dust properties. The dust extinction curve is typically characterized by R(V) ≡ A(V)/E(B − ...</p>

2024.07.02

Analytical Insights into Dark Matter Deficient Galaxies

<p>Recent observations reported a puzzling dearth of dark matter (DM) in a fraction of massive high-z galaxies and dwarf galaxies, challenging current simulation predictions within the standard ΛCDM scenario. This discrepancy underscores our limited understanding of the halo and galaxy structural evolution. Here, I will present a novel unified analytical framework for galaxy dynamical evolution d...</p>