78 citations · 374 across the 27 of their papers we have counts for
23 papers · 1 filter
Radiation Hydrodynamics of Self-gravitating Protoplanetary Disks II. Accretion, Migration, Spin, and Internal Structure of GI Fragments
Yang Ni, Hongping Deng, Xue-Ning Bai
In the first paper of this series, we showed that gravitational instability (GI) in protoplanetary disks can produce fragments of planetary rather than brown-dwarf mass, leaving th…
A Formation-Stage Bottleneck for Exomoons around Close-in Rocky Planets
Rongxi Bi, Hongping Deng, Christian Reinhardt +2
Massive moons around rocky exoplanets are expected outcomes of giant impacts, yet no exomoon has been securely confirmed. We address this problem using meshless finite-mass simulat…
Turbulent infall onto class 0 disks as cause of CAI brief condensation episode in the solar system
Jiachen Zheng, Xing Wei, Hongping Deng +2
Calcium-aluminum-rich inclusions (CAIs) in carbonaceous chondritic meteorites are the oldest relics in the solar system. Notably, their radiogenic age feature a brief (100 kyr) con…
Effects of Stellar X-ray Photoevaporation on Planetesimal Formation via the Streaming Instability
Xuchu Ying, Beibei Liu, Haifeng Yang +7
The formation of planetesimals via the streaming instability (SI) is a crucial step in planet formation, yet its triggering conditions and efficiency are highly sensitive to both d…
The stochastic nature of migration of disc instability protoplanets in three-dimensional hydrodynamical and MHD simulations of fragmenting discs
Noah Kubli, Lucio Mayer, Hongping Deng +1
We present a detailed analysis of the nature of migration of protoplanetary clumps formed via disc instability in self-consistent 3D hydrodynamical (HD) and magneto-hydrodynamical…
Circumbinary accretion as a diagnostic for binary--disc misalignment
Jeremy L. Smallwood, Ya-Ping Li, Hongping Deng +1
Binary star systems can accrete material originating from a circumbinary disc. Since it is common for the circumbinary disc to be tilted with respect to the binary orbital plane, w…
Formation of free-floating planetary mass objects via circumstellar disk encounters
Zhihao Fu, Hongping Deng, Douglas N. C. Lin +1
The origin of planetary mass objects (PMOs) wandering in young star clusters remains enigmatic, especially when they come in pairs. They could represent the lowest-mass object form…
Planetesimal Growth in Evolving Protoplanetary Disks: Constraints from the Pebble Supply
Tong Fang, Hui Zhang, Shangfei Liu +2
In the core accretion model, planetesimals grow by mutual collisions and engulfing millimeter-to-centimeter particles, i.e., pebbles. Pebble accretion can significantly increase th…
Characterizing fragmentation and sub-Jovian clump properties in magnetized young protoplanetary disks
Noah Kubli, Lucio Mayer, Hongping Deng
We study the initial development, structure and evolution of protoplanetary clumps formed in 3D resistive MHD simulations of self-gravitating disks. The magnetic field grows by mea…
Turbulent Transport of Dust Particles in Protostellar Disks: The Effect of Upstream Diffusion
Tingtao Zhou, Hongping Deng, Yi-Xian Chen +1
We study the long-term radial transport of micron to mm-size grain in protostellar disks (PSDs) based on diffusion and viscosity coefficients measured from 3D global stratified-dis…
Standing solitary waves as transitions to spiral structures in gravitationally unstable accretion disks
Hongping Deng, Gordon I. Ogilvie
Astrophysical disks that are sufficiently cold and dense are linearly unstable to the formation of axisymmetric rings as a result of the disk's gravity. In practice, spiral structu…
Nonlinear behaviour of warped discs around a central object with a quadrupole moment
Hongping Deng, Gordon Ogilvie
The nonlinear behaviour of low-viscosity warped discs is poorly understood. We verified a nonlinear bending-wave theory, in which fluid columns undergo affine transformations, with…
Formation of intermediate-mass planets via magnetically-controlled disk fragmentation
Hongping Deng, Lucio Mayer, Ravit Helled
Intermediate mass planets, from Super-Earth to Neptune-sized bodies, are the most common type of planets in the galaxy. The prevailing theory of planet formation, core-accretion, p…
Parametric instability in a free evolving warped protoplanetary disc
Hongping Deng, Gordon I. Ogilvie, Lucio Mayer
Warped accretion discs of low viscosity are prone to hydrodynamic instability due to parametric resonance of inertial waves as confirmed by local simulations. Global simulations of…
Extreme close encounters between proto-Mercury and proto-Venus in terrestrial planet formation
Tong Fang, Hongping Deng
Modern models of terrestrial planet formation require solids depletion interior to 0.5-0.7 au in the planetesimal disk to explain the small mass of Mercury. Earth and Venus analogu…
Global simulations of self-gravitating magnetized protoplanetary disks
Hongping Deng, Lucio Mayer, Henrik Latter
In the early stages of a protoplanetary disk, when its mass is a significant fraction of its star's, turbulence generated by gravitational instability (GI) should feature significa…
Hypothetical hyperbolic encounters between Venus and proto-Mercury that partially \ stripped away proto-Mercury's mantle
Hongping Deng
Mercury has an unusually large metal core comprising ~70% of its mass comparing to all other terrestrial planets in the solar system. Giant impacts can remove a significant fractio…
Primordial Earth mantle heterogeneity caused by the Moon-forming giant impact
Hongping Deng, Maxim D. Ballmer, Christian Reinhardt +4
The giant impact hypothesis for Moon formation successfully explains the dynamic properties of the Earth-Moon system but remains challenged by the similarity of isotopic fingerprin…
Local simulations of MRI turbulence with meshless methods
Hongping Deng, Lucio Mayer, Henrik Latter +2
The magneto-rotational instability (MRI) is one of the most important processes in sufficiently ionized astrophysical disks. Grid-based simulations, especially those using the loca…
Giant planets and brown dwarfs on wide orbits: a code comparison project
Mark Fletcher, Sergei Nayakshin, Dimitris Stamatellos +5
Gas clumps formed within massive gravitationally unstable circumstellar discs are potential seeds of gas giant planets, brown dwarfs and companion stars. Simulations show that comp…
A special giant impact model: implications on core-mantle chemical differentiation
You Zhou, Christian Reinhardt, Hongping Deng +2
The Earths core formation process has decisive effect in the chemical differentiation between the Earths core and its mantle. Here, we propose a new core formation model which is c…
Enhanced mixing in giant impact simulations with a new Lagrangian method
Hongping Deng, Christian Reinhardt, Federico Benitez +2
Giant impacts (GIs) are common in the late stage of planet formation. The Smoothed Particle Hydrodynamics (SPH) method is widely used for simulating the outcome of such violent col…
Convergence of the critical cooling rate for protoplanetary disk fragmentation achieved; the key role of numerical dissipation of angular momentum
Hongping Deng, Lucio Mayer, Farzana Meru
We carry out simulations of gravitationally unstable disks using smoothed particle hydrodynamics(SPH) and the novel Lagrangian meshless finite mass (MFM) scheme in the GIZMO code (…