Research
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2025.01.07
The Misty and Mysterious Low Surface Brightness Universe Imaged by Dragonfly
The faint, diffuse side of the Universe is largely unexplored, with numerous interesting low surface brightness (LSB) phenomena awaiting to be mapped and understood. With state-of-the-art instruments such as Euclid, Rubin and Roman, we are starting to access a wealth of unprecedentedly deep datasets that are ideally suited for LSB science in the next decade. To fully unlock the potential of the...
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2024.12.26
Deciphering the intriguing nature of early AGN with JWST
The first two-year results of JWST have unveiled an unexpectedly large number of accreting black holes in the early Universe. Unlike the general populations of super massive black holes at the low redshifts, these early black holes exhibit distinctly different properties. They appear over-massive compared to the stellar content of their host galaxies, generally show non-detection in the hard X-...
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2024.12.23
On Precise Correction of the Milky Way Dust Extinction
Extinction correction is crucial for understanding the intrinsic properties of celestial objects within and beyond the Milky Way, especially with Gaia’s photometric precision reaching millimagnitude levels. Leveraging millions of high-quality spectra and precise atmospheric parameters from LAMOST, we have achieved unprecedented accuracy in extinction measurements. Using the “star-pair” techn...
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2024.12.16
TOI-880 Has An Aligned, Coplanar Multi-planet System [EN]
We present the stellar obliquity measurement of TOI-880 c (TOI-880.01) using Rossiter-McLaughlin (RM) observations obtained with the Keck Planet Finder (KPF). TOI-880 is a compact multi-transiting system with 3 transiting planets. Our independent analysis revealed that the host star is a K-type star. Planet b (TOI-880.02) has a radius of 2.23 ± 0.10R⊕ and an orbital period of 2.6 days; planet ...
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2024.12.09
A potential mass-gap black hole in a wide binary with a circular orbit
The mass distribution of black holes identified through X-ray emission suggests a paucity of black holes in the mass range of 3 to 5 solar masses. Modified theories have been devised to explain this mass gap, and it is suggested that natal kicks during a supernova explosion can more easily disrupt binaries with lower-mass black holes. Although recent Laser Interferometer Gravitational-Wave Obse...
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