Research Highlights
An extremely low-density planet spins slow
05 12月 2024Planets are not perfect spheres. For example, Jupiter's equatorial radius is larger than its polar radius by 7%, and this aspherical shape is due to the fast spin of Jupiter, as one day on Jupiter is only 10 hr long. The shape of a planet therefore provides a measure of the rate and the orientation of its spin, which are ultimately related to the formation and evolution history of the planet as...
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Revealing the nonlinear coupling between small-scale star formation and the large-scale galaxy ecosystem in RIGEL simulations
26 11月 2024Dwarf galaxies are the smallest, most numerous, and most abundant galaxies in the universe, making them an essential component of the cosmic ecosystem. Over the past decade, observations of the nearby universe have revealed a multitude of diverse and peculiar dwarf galaxies, whose formation and evolution remain one of the most enigmatic puzzles in galaxy formation. Due to their low mass and sha...
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A Hyperactive Fast Radio Burst in a “Clean” Environment
08 11月 2024The Greenbank Telescope and the related research highlight report can be found @ https://greenbankobservatory.org/news/u-s-national-science-foundation-green-bank-telescope-records-fastest-fast-radio-burst-yet/ Fast radio bursts (FRB) are intense radio transients from deep space, lasting only a few milliseconds. These bursts release an extraordinary amount of energy, with a single burst able to ...
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Understanding the composition of clouds on exoplanets
21 10月 2024Exoplanet's atmosphere contains the information where the planet is formed and how it accretes and evolves. Probing the atmosphere from the molecular lines in the transmission and emission spectrum unveils the chemical composition of the planet. However, an uncertain factor in retrieving exoplanet spectra is the presence of clouds. Clouds affect the transmission and emission spectrum by smearin...
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A Two-Earth-mass Planet Found Orbiting a Dead “Sun”
27 9月 2024Images of the area of the microlensing event, indicated by perpendicular white lines two weeks after peak magnification of the background star in 2020, taken by CFHT with seeing of ~ 0.5 arcsec (Left) and in 2023 after its disappearance, obtained by Keck-II with seeing of ~0.08 arcsec (Right). The planetary system with a white dwarf, a two-Earth-mass planet and brown dwarf cannot be seen; the p...
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JWST and VLT search for the signature of the First Stars
18 4月 2024The first stars, known as Population III stars, were born approximately 100 million years after the Big Bang when the universe was less than 1% of its present age. Population III stars are of fundamental importance to the initial mass function (IMF) of stars, which determines how the universe has evolved over time (see Fig. 1). As Population III stars are shortly lived, they rapidly enrich the ...
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