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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>

2024.06.20

Towards a Unified Story for Planet Formation

<p>While the exoplanetary field is replete with remarkable discoveries, perhaps the two most intriguing findings have been the detection of hot Jupiters – giant planets orbiting perilously close to their parent stars, and the startling abundance of super-Earths. The mere existence of these worlds was wholly unpredicted based on the expectations that were gleaned from centuries of observation of o...</p>

2024.06.13

Weak lensing cosmology beyond two-point shear correlations

<p>With the fast development of high-precision large photometric surveys, weak lensing (WL) effects have become one of the major probes in cosmology. While the two-point shear correlations are the most extensively employed analyses, other statistics beyond that are desired because of the non-Gaussian nature of cosmic structures. In this presentation, I will discuss the cosmological application of ...</p>

2024.06.06

From Subaru to WFST: The Past, Present, and Future of Fast Transient Studies

<p>Transients with fast brightness variance in UV/optical wavelengths (&quot;fast transients,&quot; such as early-phase supernovae, fast blue optical transients, kilonovae) are of great interest in astronomy. Although great progresses in time-domain astronomy have been made via wide, shallow, and day(s)-cadence surveys, the limited observing depth and low time resolution make traditional time-domain surveys...</p>

2024.05.30

New windows in X-ray astronomy opened by eROSITA all-sky surveys

<p>30 years after the ROSAT all-sky survey (1990), eROSITA performed X-ray all-sky surveys again in 2020-2022, in which 90% of the sky was observed in the X-ray band with high resolution for the first time. The eROSITA all-sky surveys (eRASSs) will detect millions of AGNs and tens of thousands of galaxy clusters and open a large space of discoveries. I will introduce eRASS and three research topic...</p>

2024.05.23

Precision studies of galaxy formation and cosmology

<p>I will introduce some of our recent work focused on the measurement and modeling of galaxy distribution. We have developed a new method called PAC to make use of the complementary information from redshift and photometric galaxy surveys. With this method, we are able to significantly improve the measurements of some important observational quantities such as the galaxy stellar mass function and...</p>