6 papers
Spectral Appearance of Self-gravitating Disks Powered by Stellar Objects: Universal Effective Temperature in the Optical Continuum and Application to Little Red Dots
Yi-Xian Chen, Hanpu Liu, Ruancun Li +6
We revisit the spectral appearance of extended self-gravitating accretion disks surrounding compact central objects such as supermassive black holes. Using dust-poor opacities, we…
Water absorption confirms cool atmospheres in two little red dots
Bingjie Wang, Joel Leja, Ivo Labbe +35
Little red dots (LRDs) are an abundant population of compact high-redshift sources with red rest-frame optical continua, discovered by the James Webb Space Telescope (JWST). Their…
Stellar Evolution with Radiative Feedback in AGN Disks
Zheng-Hao Xu, Yi-Xian Chen, Douglas N. C. Lin
Stars embedded in the inner pc region of an active galactic nucleus (AGN) experience extreme accretion conditions that significantly alter their evolution. We present one-dimension…
Gravitational Instability and Fragmentation in Collapsar Disks Supports the Formation of Sub-Solar Neutron Stars
Yi-Xian Chen, Brian D. Metzger
We perform three-dimensional shearing-box hydrodynamical simulations to explore the outcome of gravitational instability in the outer regions of neutrino-cooled disks such as those…
Accretion of AGN Stars under Influence of Disk Geometry
Yi-Xian Chen, Yan-Fei Jiang, Jeremy Goodman
Massive stars can form within or be captured by AGN disks, influencing both the thermal structure and metallicity of the disk environment. In a previous work, we investigated isotr…
One-loop Matching Factors for Singlet Quasi-Parton Distribution Functions in the Hybrid-Ratio Scheme
Yi-Xian Chen, Jiunn-Wei Chen
The one loop matching kernels between parton distribution functions (PDFs) for parton and their corresponding quasi-PDFs are computed at one loop in the hybrid-ratio sc…