科学研究
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2024.08.19
Beyond Summary Statistics: Leveraging Generative Models for Field-Level Weak Lensing Analysis
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...
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2024.08.16
Unveiling the Milky Way Dust Extinction Curve in 3D
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 − ...
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2024.07.08
Damping Obliquities of Hot Jupiter Hosts by Resonance Locking
When orbiting hotter stars, hot Jupiters are often highly inclined relative to their host star equator planes. By contrast, hot Jupiters orbiting cooler stars are more aligned. Prior attempts to explain this correlation between stellar obliquity and effective temperature have proven problematic. We show how resonance locking—the coupling of the planet's orbit to a stellar gravity mode (g-mode)...
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2024.07.03
Exoplanet atmospheres with high-resolution spectroscopy: chemistry, isotopes, and dynamics
Exoplanet atmospheres with imprints from their history open an important avenue to trace the origin and evolution of planets. With high-dispersion spectroscopy, we can resolve atomic and molecular spectral features into unique forests of lines that serve as fingerprints for identifying different species and probing structures and dynamics of exoplanet atmospheres. I will talk about high-resolut...
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2024.07.02
New Results in Three-Dimensional Core-Collapse Supernova Theory
The theory of core-collapse supernova (CCSN) has evolved significantly in the past few years with the help of long term 3D simulations. In this talk, I will present many new scientific results based on the large set of CCSN simulations calculated by the code Fornax, focusing on the important role of three dimensional effects. I will talk about theoretical observables such as explosion energy, ...
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