41 citations · 260 across the 28 of their papers we have counts for
30 papers
Simulating the thermodynamics of gas, radiation, and multispecies dust: Method and applications to protoplanetary disks
Dhruv Muley, David Melon Fuksman, Prakruti Sudarshan +2
The thermodynamics of protoplanetary disks, governed by a complex interplay between gas, dust, and radiation, exerts a strong influence on their morphology and dynamics at both lar…
Just a Phase? Weakening Vertical Shear Instability Explains Class II Disk Morphologies: Simulations with dust coagulation, sedimentation, thermal relaxation, and backreaction
Thomas Pfeil, Alexandros Ziampras, Shangjia Zhang +2
The Vertical Shear Instability (VSI) is known to create turbulence and strong vertical mixing in protoplanetary disks if thermal relaxation is sufficiently fast. In simulations whe…
The Influence of Dust Composition on Accretion Outbursts
Nicolas Kaufmann, Anna B. T. Penzlin, Alfie Robinson +3
Context: Episodic accretion outbursts have been shown to occur in protoplanetary discs due to thermal instability at the inner edge of the dead zone. These outbursts periodically h…
Formation of multiple dust rings and gaps in protoplanetary discs by a single migrating planet II: radiative discs and observational signatures
Kim M. Weiskopf, Sören C. Meiners, Alexandros Ziampras +1
Dust structures in protoplanetary discs have been widely observed and their creation remains an active field of research. Several possible origins have already been explored, inclu…
Planet formation at the inner edge of the dead zone II. Outbursts, rings, vortices, and suppression of planetesimal formation
Alexandros Ziampras, Tilman Birnstiel
Accretion outbursts have been observed in a variety of young stellar objects, but models of their dynamical evolution have been largely limited to axisymmetric models due to their…
Substructure in externally irradiated protoplanetary disks, I. spirals and rings in two-dimensional radiation hydrodynamics
Alexandros Ziampras, Lin Qiao, Thomas J. Haworth
It is known that the external irradiation of protoplanetary disks by nearby massive stars can result in mass loss that impacts the disk evolution, however the dynamical impact of e…
The Circumbinary Disc of HD 34700A II. Analysis of a strong dust asymmetry
Daniele Fasano, Myriam Benisty, Jochen Stadler +8
ALMA observations have shown that substructures are ubiquitous in protoplanetary discs. A sub-group, the transition discs, shows large cavities and rings in dust continuum. Among t…
The role of detailed gas and dust opacities in shaping the evolution of the inner disc edge subject to episodic accretion
Michael Cecil, Mario Flock, Mykola G. Malygin +4
We investigate the effects of different dust and gas opacity descriptions on the structure and evolution of the inner regions of protoplanetary discs. The influence on the episodic…
Planet formation at the inner edge of the dead zone I. the interplay between accretion outbursts and dust growth
Alexandros Ziampras, Tilman Birnstiel, Nicolas Kaufmann +2
The inner edge of the dead zone in protoplanetary disks has been shown to periodically go unstable, leading to accretion outbursts and annular substructure within the dead zone. Wh…
Starlight-driven flared-staircase geometry in radiation hydrodynamic models of protoplanetary disks
Prakruti Sudarshan, Mario Flock, Alexandros Ziampras +2
Protoplanetary disks observed in millimeter continuum and scattered light show a variety of substructures. Various physical processes in the disk could trigger such features -- one…
Sculpting protoplanetary discs -- modelling circumbinary cavities at observable scales with radiation hydrodynamics
Anna B. T. Penzlin, Alexandros Ziampras, Nicolas T. Kurtovic +2
Observations of circumbinary discs reveal inner cavities, with their shape and size varying strongly between different systems. The structure of the cavity is determined by the com…
How two-dimensional are planet--disc interactions? I. Locally isothermal discs
Amelia J. Cordwell, Alexandros Ziampras, Joshua J. Brown +1
Planet--disc interactions, despite being fundamentally three-dimensional, are often studied in the two-dimensional `thin-disk' approximation. The overall morphology of planet--disc…
How two-dimensional are planet-disc interactions? II. Radiation hydrodynamics and suitable cooling prescriptions
Alexandros Ziampras, Amelia J. Cordwell, Roman R. Rafikov +1
The ring and gap structures found in observed protoplanetary disks are often attributed to embedded gap-opening planets and typically modeled with simplified thermodynamics in the…
Turbulence in protoplanetary disks: A systematic analysis of dust settling in 33 disks
M. Villenave, G. Rosotti, M. Lambrechts +7
The level of dust vertical settling and radial dust concentration in disks is of critical importance for understanding the efficiency of planet formation. We present the first unif…
Halting the migration of super-Earths by efficient gap opening in radiative, low viscosity disks
Alexandros Ziampras, Richard P. Nelson, Sijme-Jan Paardekooper
While planet migration has been extensively studied for classical viscous disks, planet-disk interaction in nearly inviscid disks has mostly been explored with greatly simplified t…
Spirals, rings, and vortices shaped by shadows in protoplanetary disks: from radiative hydrodynamical simulations to observable signatures
Alexandros Ziampras, Cornelis P. Dullemond, Tilman Birnstiel +2
Numerous protoplanetary disks exhibit shadows in scattered light observations. These shadows are typically cast by misaligned inner disks and are associated with observable structu…
Dusty substructures induced by planets in ALMA disks: how dust growth and dynamics changes the picture
Alexandros Ziampras, Prakruti Sudarshan, Cornelis P. Dullemond +4
Protoplanetary disks exhibit a rich variety of substructure in millimeter continuum emission, often attributed to unseen planets. As these planets carve gaps in the gas, dust parti…
Buoyancy torques prevent low-mass planets from stalling in low-turbulence radiative disks
Alexandros Ziampras, Richard P. Nelson, Sijme-Jan Paardekooper
Low-mass planets migrating inwards in laminar protoplanetary disks (PPDs) experience a dynamical corotation torque, which is expected to slow down migration to a stall. However, ba…
Overstability of the 2:1 mean motion resonance: Exploring disc parameters with hydrodynamic simulations
Zahra Afkanpour, Sareh Ataiee, Alexandros Ziampras +5
Resonant planetary migration in protoplanetary discs can lead to an interplay between the resonant interaction of planets and their disc torques called overstability. While theoret…
Migration of low-mass planets in inviscid disks: the effect of radiation transport on the dynamical corotation torque
Alexandros Ziampras, Richard P. Nelson, Sijme-Jan Paardekooper
Low-mass planets migrate in the type-I regime. In the inviscid limit, the contrast between the vortensity trapped inside the planet's corotating region and the background disk vort…
Buoyancy response of a disk to an embedded planet: a cross-code comparison at high resolution
Alexandros Ziampras, Sijme-Jan Paardekooper, Richard P. Nelson
In radiatively inefficient, laminar protoplanetary disks, embedded planets can excite a buoyancy response as gas gets deflected vertically near the planet. This results in vertical…
Measuring the Numerical Viscosity in Simulations of Protoplanetary Disks in Cartesian Grids -- The Viscously Spreading Ring Revisited
Jibin Joseph, Alexandros Ziampras, Lucas Jordan +2
Hydrodynamical simulations solve the governing equations on a discrete grid of space and time. This discretization causes numerical diffusion similar to a physical viscous diffusio…
Modeling planet-induced gaps and rings in ALMA disks: the role of in-plane radiative diffusion
Alexandros Ziampras, Richard P. Nelson, Roman R. Rafikov
ALMA observations of protoplanetary disks in dust continuum emission reveal a variety of annular structures. Attributing the existence of such features to embedded planets is a pop…
Hydrodynamic turbulence in disks with embedded planets
Alexandros Ziampras, Wilhelm Kley, Richard P. Nelson
The vertical shear instability (VSI) is a source of hydrodynamic turbulence that can drive vigorous vertical mixing and moderate levels of accretion in protoplanetary disks, and it…