241 citations · 2.6k across the 97 of their papers we have counts for
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Near-Horizon Tidal Disruption Events
Yang Yang, Xian Chen
Tidal disruption events (TDEs) offer a unique dynamical probe of the spacetime geometry around supermassive black holes (SMBHs). While conventional TDEs occur around SMBHs of $M_\b…
Electromagnetic alignment and jet precession around supermassive black holes: Quasi-periodic oscillations in tidal disruption events
Pau Amaro-Seoane, Leif Lui, Alejandro Torres-Orjuela +1
We evaluate quasi-periodic oscillations and jet formation in tidal disruption events using the covariant formulation of electromagnetic angular-momentum transfer. General-relativis…
A Whisper from Within: Response of a Pulsar Timing Array to an Internal Gravitational-wave Source
Houyuan Qi, Xian Chen, Lin Wang +1
Millisecond pulsars (MSPs) are abundant in globular clusters (GCs) and probably also in galactic nuclei. They offer the potential to form a miniature pulsar timing array (mini-PTA)…
Extreme Mass Ratio Inspirals in Light of Quasi-periodic Eruptions: Milli-Hertz Gravitational Wave Background
Brennen Black, Xian Chen, Zhen Pan
Quasi-periodic eruptions (QPEs) are repeated X-ray bursts originating in galactic nuclei. Of the many proposed models, the favored model is the disk-collision model in which a stel…
A Novel Method to Construct Frequency-Domain Gravitational Waveform for Accelerating Sources
Xinmiao Zhao, Han Yan, Xian Chen
Accurately modeling the inspiral-merger-ringdown (IMR) signal of coalescing compact objects is essential for the test of general relativity. However, it is known that astrophysical…
Constraining the Fraction of LIGO/Virgo/KAGRA Binary Black Hole Merger Events Associated with Active Galactic Nucleus Flares
Liang-Gui Zhu, Lei He, Xian Chen +1
The formation channels of binary black hole (BBH) mergers detected by the LIGO/Virgo/KAGRA (LVK) network remain uncertain. While BBH mergers occurring inside active galactic nucleu…
Relativistic Tidal Dissipation and the Gravitational-wave Signal of a White Dwarf Orbiting an Intermediate-Mass Black Hole
Yang Yang, Leif Lui, Alejandro Torres-Orjuela +1
Finding intermediate-mass black holes (IMBHs) and measuring their masses and spins are key to understanding massive black hole formation. White dwarf (WD)-IMBH binaries provide a u…
Detecting Intermediate-mass Black Holes Using Miniature Pulsar Timing Arrays in Globular Clusters
Xian Chen, Verónica Vázquez-Aceves, Siyuan Chen +3
Theoretical models predict that intermediate-mass black holes (IMBHs) exist in globular clusters (GCs), but observational evidence remains elusive. Millisecond pulsars (MSPs), whic…
The Emergence of Little Red Dots from Binary Massive Black Holes
Kohei Inayoshi, Jinyi Shangguan, Xian Chen +2
Little red dots (LRDs) are a newly identified class of broad-line active galactic nuclei (AGN) with a distinctive v-shape spectrum characterized by red optical and blue UV continuu…
Probing intermediate-mass black hole binaries with the Lunar Gravitational-wave Antenna
Hanlin Song, Han Yan, Yacheng Kang +3
New concepts for observing the gravitational waves (GWs) using a detector on the Moon, such as the Lunar Gravitational-wave Antenna (LGWA), have gained increasing attention. By uti…
Impact of mass transfer on the orbital evolution of a white dwarf close to an intermediate-mass black hole
Yang Yang, Jie Yang, Xian Chen +1
Extreme mass ratio inspirals (EMRIs) of low-mass white dwarfs (WDs, 0.1 - 0.3 Msun) around spinning intermediate-mass black holes (IMBHs, 10^3 - 10^5 Msun) offer unique opportuniti…
Formation Rate of Quasiperiodic Eruptions in Galactic Nuclei Containing Single and Dual Supermassive Black Holes
Chunyang Cao, F. K. Liu, Xian Chen +1
Quasiperiodic eruptions (QPEs) are a novel class of transients recently discovered in a few extragalactic nuclei. It has been suggested that a QPE can be produced by a main-sequenc…
The fate of EMRI-IMRI pairs in AGN accretion disks: hydrodynamic and three body simulations
Peng Peng, Alessia Franchini, Matteo Bonetti +2
Extreme-mass-ratio inspirals (EMRIs) and intermediate-mass-ratio inspirals (IMRIs) are important gravitational wave (GW) sources for the Laser Interferometer Space Antenna (LISA).…
A Recent Supermassive Black Hole Binary in the Galactic Center Unveiled by the Hypervelocity Stars
Chunyang Cao, Fukun Liu, Shuo Li +2
When a binary of early-type stars from the young stellar populations in the Galactic center (GC) region is scattered to the vicinity of the supermassive black hole (SMBH) Sgr~$\rm{…
GWnext 2024: Meeting Summary
Alejandro Torres-Orjuela, Veronica Vazquez-Aceves, Rui Xu +19
GWnext 2024 was a meeting held in the Kavli Institute for Astronomy and Astrophysics at Peking University in March , 2024. In the meeting researchers at…
The dynamics and gravitational-wave signal of a binary flying closely by a Kerr supermassive black hole
Zhongfu Zhang, Xian Chen
Recent astrophysical models predict that stellar-mass binary black holes (BBHs) could form and coalesce within a few gravitational radii of a supermassive black hole (SMBH). Detect…
Unveiling the solution to the final-parsec problem by combining milli-Hertz gravitational-wave observation and AGN survey
Liang-Gui Zhu, Xian Chen
Massive black hole binaries (MBHBs) could be the loudest gravitational-wave (GW) sources in milli-Hertz (mHz) GW band, but their dynamical evolution may stall when the black holes…
The appearance of a merging binary black hole very close to a spinning supermassive black hole
Xiaoyue Zhang, Xian Chen
The mass and distance of a binary black hole (BBH) are fundamental parameters to measure in gravitational-wave (GW) astronomy. It is well-known that the measurement is affected by…
Tracing the Evolution of SMBHs and Stellar Objects in Galaxy Mergers: An Multi-mass Direct N-body Model
Shuo Li, Shiyan Zhong, Peter Berczik +3
By using direct N-body numerical simulations, we model the dynamical co-evolution of two supermassive black holes (SMBHs) and the surrounding stars in merging galaxies. In order to…
Synchronizing the EMRIs and IMRIs in AGN accretion disks
Peng Peng, Xian Chen
Extreme-mass-ratio inspirals (EMRIs) and intermediate-mass-ratio inspirals (IMRIs) are important gravitational-wave (GW) sources for the Laser Interferometer Space Antenna (LISA).…
Detecting Accelerating Eccentric Binaries in the LISA Band
Zeyuan Xuan, Smadar Naoz, Xian Chen
Many gravitational wave (GW) sources in the LISA band are expected to have non-negligible eccentricity. Furthermore, many of them can undergo acceleration because they reside in th…
Binaries Wandering Around Supermassive Black Holes Due To Gravito-electromagnetism
Xian Chen, Zhongfu Zhang
Extreme-mass-ratio inspirals (EMRIs) are important sources for space-borne gravitational-wave (GW) detectors. Such a source normally consists of a stellar-mass black hole (BH) and…
Milli-Hertz Gravitational Wave Background Produced by Quasi-Periodic Eruptions
Xian Chen, Yu Qiu, Shuo Li +1
Extreme-mass-ratio inspirals (EMRIs) are important targets for future space-borne gravitational-wave (GW) detectors, such as the Laser Interferometer Sapce Antenna (LISA). Recent w…
The Eccentric and Accelerating Stellar Binary Black Hole Mergers in Galactic Nuclei: Observing in Ground and Space Gravitational Wave Observatories
Fupeng Zhang, Xian Chen, Lijing Shao +1
We study the stellar binary black holes (BBHs) inspiralling/merging in galactic nuclei based on our numerical method GNC. We find that of all new born BBHs will finally me…