Dong Lai
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View article: Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows
Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows Open
Observations of accreting black hole (BH) systems, such as microquasars and supermassive BHs, often reveal a precessing jet with changing directions, indicating a misaligned accretion flow relative to the BH spin. The precession is commonl…
View article: Binary Stars Approaching Supermassive Black Holes: Hydrodynamics of Stellar Collisions, Mass Fallback, and Partial Tidal Disruption Events
Binary Stars Approaching Supermassive Black Holes: Hydrodynamics of Stellar Collisions, Mass Fallback, and Partial Tidal Disruption Events Open
When binaries are injected into low-angular-momentum orbits around a central supermassive black hole (SMBH), various outcomes can occur, including binary tidal breakup, double stellar disruptions, and stellar collision. We use hydrodynamic…
View article: Stellar Obliquity Excitation via Disk-dispersal-driven Resonances in Binaries
Stellar Obliquity Excitation via Disk-dispersal-driven Resonances in Binaries Open
The stellar obliquity of a planetary system is often used to help constrain the system’s formation and evolution. One of the mechanisms to reorient the stellar spin involves a secular resonance crossing due to the dissipation of the protop…
View article: A Binary Origin for Ultralong-period Radio Pulsars
A Binary Origin for Ultralong-period Radio Pulsars Open
We propose a possible binary evolution model for the formation of ultralong-period pulsars. The model involves two key stages: first, a neutron star (NS) in wide binaries undergoes an effective spin-down phase through wind-fed accretion fr…
View article: A binary origin of ultra-long period radio pulsars
A binary origin of ultra-long period radio pulsars Open
We propose a possible binary evolution model for the formation of ultra-long period pulsars (ULPPs). The model involves two key stages: first, a neutron star (NS) in wide binaries undergoes an effective spin-down phase through wind-fed acc…
View article: Physics of Strong Magnetism with eXTP
Physics of Strong Magnetism with eXTP Open
In this paper we present the science potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission, in its new configuration, for studies of strongly magnetized compact objects. We discuss the scientific potential of eXTP for quant…
View article: Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows
Magnetically Driven Retrograde Precession in Misaligned Black Hole Accretion Flows Open
Observations of accreting black hole (BH) systems, such as microquasars and supermassive black holes, often reveal a precessing jet with changing directions, indicating a misaligned accretion flow relative to the BH spin. The precession is…
View article: Resonance Capture of a Test Particle by an Eccentric Planet in the Presence of Externally-Driven Apsidal Precession
Resonance Capture of a Test Particle by an Eccentric Planet in the Presence of Externally-Driven Apsidal Precession Open
Planets undergoing convergent migration can be captured into mean-motion resonance (MMR), in which the planets' periods are related by integer ratios. The dynamics of MMR are typically considered in isolation, including only the forces bet…
View article: Metal Pollution in Sun-like Stars from Destruction of Ultra–short-period Planets
Metal Pollution in Sun-like Stars from Destruction of Ultra–short-period Planets Open
Chemical evidence indicates that an appreciable fraction of Sun-like stars have engulfed rocky planets during their main-sequence lifetimes. We investigate whether the tidal evolution and destruction of ultra–short-period planets (USPs) ca…
View article: Binary Stars Approaching Supermassive Black Holes: Tidal Breakup, Double Stellar Disruptions, and Stellar Collision
Binary Stars Approaching Supermassive Black Holes: Tidal Breakup, Double Stellar Disruptions, and Stellar Collision Open
In galactic centers, stars and binaries can be injected into low-angular-momentum orbits, resulting in close encounters with the central supermassive black hole (SMBH). Previous works have shown that under different conditions, such close …
View article: Understanding the UV/Optical Variability of AGNs through Quasi-Periodic Large-scale Magnetic Dynamos
Understanding the UV/Optical Variability of AGNs through Quasi-Periodic Large-scale Magnetic Dynamos Open
The UV/optical light curves observed in active galactic nuclei (AGNs) are well-characterized by damped random walk (DRW) process, with the damping time $τ_d$ exhibiting correlations with both the black hole mass ($M_{BH}$) and the photon w…
View article: Equation of State of Decompressed Quark Matter, and Observational Signatures of Quark-Star Mergers
Equation of State of Decompressed Quark Matter, and Observational Signatures of Quark-Star Mergers Open
Quark stars are challenging to confirm or exclude observationally because they can have similar masses and radii as neutron stars. By performing the first calculation of the non-equilibrium equation of state of decompressed quark matter at…
View article: Stellar Obliquity Excitation via Disk Dispersal-Driven Resonances in Binaries
Stellar Obliquity Excitation via Disk Dispersal-Driven Resonances in Binaries Open
The stellar obliquity of a planetary system is often used to help constrain the system's formation and evolution. One of the mechanisms to reorient the stellar spin involves a secular resonance crossing due to the dissipation of the protop…
View article: Migration of Accreting Planets and Black Holes in Disks
Migration of Accreting Planets and Black Holes in Disks Open
Nascent planets are thought to lose angular momentum (AM) to the gaseous protoplanetary disk via gravitational interactions, leading to inward migration. A similar migration process also applies to stellar-mass black holes (BHs) embedded i…
View article: Metal pollution in Sun-like stars from destruction of ultra-short-period planets
Metal pollution in Sun-like stars from destruction of ultra-short-period planets Open
Chemical evidence indicates that an appreciable fraction of Sun-like stars have engulfed rocky planets during their main-sequence lifetimes. We investigate whether the tidal evolution and destruction of ultra-short-period planets (USPs) ca…
View article: Binary Stars Approaching Supermassive Black Holes: Tidal Break-up, Double Stellar Disruptions and Stellar Collision
Binary Stars Approaching Supermassive Black Holes: Tidal Break-up, Double Stellar Disruptions and Stellar Collision Open
In galactic centers, stars and binaries can be injected into low-angular-momentum orbits, resulting in close encounters with the central supermassive black hole (SMBH). Previous works have shown that under different conditions, such close …
View article: Progress report on the BEBOP search for circumbinary planets with radial velocities
Progress report on the BEBOP search for circumbinary planets with radial velocities Open
The BEBOP (Binaries Escorted By Orbiting Planets) survey is a search for circumbinary planets using the radial velocity spectrographs HARPS and SOPHIE, currently focusing on single-lined binaries with a mass ratio $<0.3$. Circumbinary syst…
View article: Free-floating Planets, Survivor Planets, Captured Planets, and Binary Planets from Stellar Flybys
Free-floating Planets, Survivor Planets, Captured Planets, and Binary Planets from Stellar Flybys Open
In star clusters, close stellar encounters can strongly impact the architecture of a planetary system or even destroy it. We present a systematic study of the effects of stellar flybys on two-planet systems. When such a system experiences …
View article: Extreme Resonant Eccentricity Excitation of Stars around Merging Black-Hole Binary
Extreme Resonant Eccentricity Excitation of Stars around Merging Black-Hole Binary Open
We study the dynamics of a star orbiting a merging black-hole binary (BHB) in a coplanar triple configuration. During the BHB's orbital decay, the system can be driven across the apsidal precession resonance, where the apsidal precession r…
View article: Migration of Accreting Planets and Black Holes in Disks
Migration of Accreting Planets and Black Holes in Disks Open
Nascent planets are thought to lose angular momentum (AM) to the gaseous protoplanetary disk via gravitational interactions, leading to inward migration. A similar migration process also applies to stellar-mass black holes (BHs) embedded i…
View article: Mass Ejection Driven by Sudden Energy Deposition in Stellar Envelopes
Mass Ejection Driven by Sudden Energy Deposition in Stellar Envelopes Open
A number of stellar astrophysical phenomena, such as tidal novae and planetary engulfment, involve sudden injection of subbinding energy in a thin layer within the star, leading to mass ejection of the stellar envelope. We use a 1D hydrody…
View article: Formation of Merging Stellar-mass Black Hole Binaries by Gravitational-wave Emission in Active Galactic Nucleus Disks
Formation of Merging Stellar-mass Black Hole Binaries by Gravitational-wave Emission in Active Galactic Nucleus Disks Open
Many stellar-mass black holes (sBHs) are expected to orbit supermassive black holes at galactic centers. For galaxies with active galactic nuclei, it is likely that the sBHs reside in a disk. We study the formation of sBH binaries via grav…
View article: Hydrodynamical evolution of black-hole binaries embedded in AGN discs – III. The effects of viscosity
Hydrodynamical evolution of black-hole binaries embedded in AGN discs – III. The effects of viscosity Open
Stellar-mass binary black holes (BBHs) embedded in active galactic nucleus (AGN) discs offer a distinct dynamical channel to produce black hole mergers detected in gravitational waves by LIGO/Virgo. To understand their orbital evolution th…
View article: Dynamical Friction Models for Black Hole Binary Formation in Active Galactic Nucleus Disks
Dynamical Friction Models for Black Hole Binary Formation in Active Galactic Nucleus Disks Open
Stellar-mass black holes (sBHs) embedded in gaseous disks of active galactic nuclei (AGN) can be important sources of detectable gravitational radiation for LIGO/Virgo when they form binaries and coalesce due to orbital decay. In this pape…
View article: Mass Ejection Driven by Sudden Energy Deposition in Stellar Envelopes
Mass Ejection Driven by Sudden Energy Deposition in Stellar Envelopes Open
A number of stellar astrophysical phenomena, such as tidal novae and planetary engulfment, involve sudden injection of sub-binding energy in a thin layer within the star, leading to mass ejection of the stellar envelope. We use a 1D hydrod…
View article: Dynamical instability in multi-orbiter systems with gas friction
Dynamical instability in multi-orbiter systems with gas friction Open
Closely packed multiplanet systems are known to experience dynamical instability if the spacings between the planets are too small. Such instability can be tempered by the frictional forces acting on the planets from gaseous discs. A simil…
View article: Potential Melting of Extrasolar Planets by Tidal Dissipation
Potential Melting of Extrasolar Planets by Tidal Dissipation Open
Tidal heating on Io due to its finite eccentricity was predicted to drive surface volcanic activity, which was subsequently confirmed by the Voyager spacecraft. Although the volcanic activity in Io is more complex, in theory volcanism can …
View article: Planet-driven scatterings of planetesimals into a star: probability, time-scale, and applications
Planet-driven scatterings of planetesimals into a star: probability, time-scale, and applications Open
A planetary system can undergo multiple episodes of intense dynamical activities throughout its life, resulting in the production of star-grazing planetesimals (or exocomets) and pollution of the host star. Such activity is especially pron…
View article: Potential Melting of Extrasolar Planets by Tidal Dissipation
Potential Melting of Extrasolar Planets by Tidal Dissipation Open
Tidal heating on Io due to its finite eccentricity was predicted to drive surface volcanic activity, which was subsequently confirmed by the $\textit{Voyager}$ spacecrafts. Although the volcanic activity in Io is more complex, in theory vo…