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2025.03.28

Design, Testing, and Commissioning of the Sun Yat-sen University 80 cm Infrared Telescope [EN]

<p>The Sun Yat-sen University (SYSU) 80cm infrared telescope is designed for near-infrared time-domain observations. It’s primary scientific objectives include follow-up of transients such as supernovae, gamma-ray burst afterglows, tidal disruption events, and monitoring of brown dwarfs, AGNs and variable stars. The telescope has an 80cm diameter with f/8, and is capable of observing in J and K b...</p>

2025.03.21

Revealing the nature of IRAC Optical Dropouts in the Deep HSC fields [EN]

<p>Using the data from the Spitzer Space Telescope in the Deep HSC fields, we have found a mysterious population of objects that are detected at SNR&gt;5 in the 3-5 micron (IRAC ch1 and ch2) but are either very red with Y-ch1&gt;3.5 or totally invisible in the much deeper optical. Their median magnitudes are 23.95 and 23.68 AB in ch1 and ch2, respectively; 6% of the objects are also detected in IRAC ch3...</p>

2025.03.14

Expect the unexpected – Augmented astrophysical models for black hole population studies

<p>GW observations are now revealing the population of black holes via the detection of binary black hole mergers, and the numbers are set to grow rapidly in the coming years: the distribution of astrophysical properties of binary black holes provides a key to interpret their formation channels. In this regard, scientists have proposed a variety of models for the black hole distribution, broadly c...</p>

2025.03.07

Turbulent HI Gas Driven by the SN Bubbles [EN]

<p>The interstellar medium (ISM) is turbulent, and the energy sources driving this turbulence, particularly in HI gas, remain uncertain. Recently, stellar feedback, especially from supernovae (SNe), has been proposed as a potential mechanism for energy injection into the ISM. However, the specific processes involved are still unclear and require observational evidence. Using deep HI datacubes from...</p>

2025.02.28

First Euclid High-z Quasars In the Wide Survey

<p>Luminous high-z quasars provide direct probes of the buildup of supermassive black holes, the primeval massive galaxies hosting them, and the intergalactic medium during the epoch of reionization. Despite its extraordinary capabilities, a significant challenge remains: the lack of quasar samples at redshift larger than 7. The Euclid space telescope offers a promising avenue to enrich our quasar...</p>

2025.01.10

The Misty and Mysterious Low Surface Brightness Universe Imaged by Dragonfly

<p>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...</p>

2025.01.03

Deciphering the intriguing nature of early AGN with JWST

<p>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-...</p>

2024.12.27

On Precise Correction of the Milky Way Dust Extinction

<p>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...</p>

2024.12.20

TOI-880 Has An Aligned, Coplanar Multi-planet System [EN]

<p>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 ...</p>

2024.12.13

A potential mass-gap black hole in a wide binary with a circular orbit

<p>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...</p>