科学研究
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2023.03.09
Re-investigating A Puzzle in Kepler Planets
super-Earths and mini-Neptunes (shortened as 'kepler planets') are the most abundant type of planets known to us. Currently, their formation channel is under debate.In this talk, I will discuss our attempt to solve a small puzzle in the observations of these planets. We were led to claim that, after formation, each of these planets have scattered and digested a few Mars-massed objects. The smal...
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2023.03.02
The variation of the stellar initial mass function (IMF) with metallicity and time
The stellar IMF is one of the most important astrophysical distributions and plays vital role in galactic astronomy. Both constant and variable IMFs across different environments have been claimed despite a large number of theoretical and observational efforts. However, the measurement of the IMF in Galactic stellar populations has been limited by the relatively small number of photometrically ...
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2023.02.23
Solar-like Oscillations: Past, Present, & Future
The analysis and interpretation of stellar oscillations ---asteroseismology --- permits direct observational examination of stellar interiors. In particular, low-degree p-modes, excited through the same stochastic convective mechanism as in our Sun, permit us to draw inferences about the global properties, interior structures, rotational dynamics, and evolutionary fates of field stars. Space-ba...
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2023.01.04
Mapping Interstellar Magnetic Field Strength in the Era of FAST, FASTA, and SKA
Magnetic field is one of the most important physical quantities regulating the evolution of interstellar medium and star formation in the Milky Way. Despite enormous surveys using techniques of dust polarization, Faraday rotation, and synchrotron polarization to reveal the magnetic field structure of the Milky Way, none of the techniques can give accurate magnetic field strength. Zeeman effect ...
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2023.01.03
On Modelling Complex Systems in Astronomy
Astronomy today is fundamentally different than it was even just a decade ago. Our increasing ability to collect a large amount of data from ever more powerful instruments has enabled many new opportunities. However, such an opportunity also comes with new challenges. The bottleneck stems from the fact that most astronomical observations are inherently high dimension — from “imaging” the Uni...
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