科学研究
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2024.06.25
Probing Cosmic Reionization with JWST/NIRSpec Ly Observations
The JWST is ushering in a new era of observing galaxies in the reionization era, providing us new insights into this last major phase transition of the Universe. The Ly-alpha emission from young star forming galaxies, which is sensitive to the presence of neutral HI along the line of sight, has been used as an important probe of the reionization process. JWST/NIRSpec offers spectroscopic capabi...
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2024.06.24
Photoionization models with turbulent structures
Turbulence features ubiquitously in the interstellar medium, especially in the high-redshift Universe. Photoionization models with turbulent ISM density fields can predict nebular emission lines more realistically than the former uniform density/pressure photoionization models. In this talk, we will briefly introduce a turbulent photoionization model grid created by the cutting-edge 3D Monte Ca...
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2024.06.21
Granulation in Red Supergiants: The Scaling Relations
Granulations are structures characterized by convection cells reaching the stellar surface and are well-known through observations of the Sun. However, similar granulation structures may also be present on the surfaces of the largest and brightest cool stars in the Universe—the red supergiants (RSGs)—potentially serving as the primary mechanism of their irregular light variations. As predicte...
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2024.06.20
Towards a Unified Story for Planet Formation
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...
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2024.06.18
The strong-lensing revolution in the JWST-Rubin-Roman era: from resolving the Hubble tension to constraining baryonic feedback
Despite the remarkable success of the Lambda Cold Dark Matter (LCDM) cosmological model, several challenges have recently emerged. One of the most prominent is the “Hubble tension”: the Hubble expansion rate (H_0) measured using the Cepheid-calibrated distance ladder of type Ia supernovae and the value extrapolated from the cosmic microwave background using LCDM disagree by 5 standard deviati...
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