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arxiv: 2605.12607 · v1 · submitted 2026-05-12 · 🌌 astro-ph.EP

Recognition: 2 theorem links

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αβ q_th-mapping of planet-induced density wave damping in protoplanetary discs

Amelia J. Cordwell , Roman R. Rafikov
Authors on Pith no claims yet

Pith reviewed 2026-05-14 20:22 UTC · model grok-4.3

classification 🌌 astro-ph.EP
keywords protoplanetary discsdensity wavesplanet-disc interactionwave dampinghydrodynamic simulationsangular momentum depositionshock formationradiative cooling
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The pith

Nonlinear shocks usually dominate damping of planet-launched density waves, but cooling on orbital timescales rivals them for sub-thermal planets while viscosity needs high values to matter.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

Planets embedded in protoplanetary discs excite density waves that transport angular momentum outward, and the physical process that damps these waves controls how the planets carve gaps and rings. This study maps the relative strength of three damping channels—nonlinear shock formation, radiative cooling, and viscous dissipation—by running hydrodynamic simulations across a grid of planet masses, cooling times, and viscosity strengths. The results show that wave breaking into shocks typically deposits angular momentum most efficiently, yet cooling with a timescale near one orbital period reaches comparable efficiency once planet mass drops below the thermal mass. Viscosity, by contrast, remains inefficient and only becomes noticeable at rather high values. These mappings supply a practical way to connect observed disc substructures to the underlying disc conditions.

Core claim

Nonlinear wave evolution leading to shock formation is typically the most important cause of angular momentum deposition, but that cooling on timescales comparable to local orbital time reaches similar levels of importance for low mass planets (sub-thermal, q_th<1). On the contrary, linear wave damping due to viscosity is rather inefficient, requiring α ≳ 10^{-1.5} to noticeably affect damping of waves launched by thermal mass planets. Even for lowest mass planets considered (q_th=0.025), viscosity affects wave damping only if α ≳ 10^{-2.9}.

What carries the argument

The joint mapping of wave angular momentum deposition profiles across the α-β-q_th parameter space extracted from hydrodynamic simulations that vary planetary mass, viscosity coefficient, and cooling timescale.

If this is right

  • Cooling becomes a first-order effect for sub-thermal planets and must be included when modeling their gap-opening ability.
  • Viscosity can be neglected in wave-damping calculations unless its value exceeds roughly 10^{-2} even for the smallest planets.
  • Observed disc gaps around low-mass planets may reflect a mixture of shock and cooling damping rather than shocks alone.
  • The same damping hierarchy should apply to waves in other thin astrophysical discs where similar parameters can be defined.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Discs with moderate cooling rates may show shallower or narrower gaps around low-mass planets than pure shock models predict.
  • Including magnetic fields in future runs could shift the relative importance of cooling versus shocks if they enhance effective viscosity or alter wave propagation.
  • The αβq_th maps offer a route to constrain local disc cooling times from the detailed shape of observed gaps once planet masses are known.

Load-bearing premise

The hydrodynamic simulations capture all relevant damping physics without missing contributions from magnetic fields, realistic radiative transfer, or three-dimensional effects.

What would settle it

A mismatch between predicted radial profiles of angular momentum deposition and those inferred from observed gap depths in a disc with independently estimated planet mass, cooling time, and viscosity would falsify the claimed dominance ordering of the three mechanisms.

Figures

Figures reproduced from arXiv: 2605.12607 by Amelia J. Cordwell, Roman R. Rafikov.

Figure 1
Figure 1. Figure 1: A representative example of (a) excitation torque density, d𝑇/d𝑅, and (b) angular momentum deposition, d𝐹dep/d𝑅, from isothermal simula￾tions with a 1𝑀th planet (𝑞th = 1), for different values of viscous 𝛼 (indicated in the legend). The observed torque excitation is due to Lindblad resonances and angular momentum deposition is driven essentially by shock dissipation only (the wave shocks first at radii whe… view at source ↗
Figure 2
Figure 2. Figure 2: Representative radial profiles of (a) torque excitation and (b) an￾gular momentum deposition from inviscid simulations with a 1𝑀th planet (𝑞th = 1), for different values of the cooling timescale 𝛽 (indicated in the legend). Panel (b) also shows (vertical gray lines) the radial extent of the co-orbital region occupied by horseshoe orbits as measured from the 𝛽 = 0 simulations. Changes in cooling timescale m… view at source ↗
Figure 4
Figure 4. Figure 4: (a) One-sided (𝑇OSL) and (b) total (𝑇) torques compared with linear theory as a function of cooling time 𝛽 and planetary mass 𝑀p (colors, see legend). Linear calculations using the methods of Miranda & Rafikov (2020a) are shown in the gray circles and dashed line. Whilst the linear calculation provides a good estimate of the one-sided torque in the low mass case it fails to accurately predict total torques… view at source ↗
Figure 3
Figure 3. Figure 3: Excitation torque density d𝑇/d𝑅 as a function of planetary mass 𝑀p (colors, shown in legend) and cooling timescale 𝛽 from inviscid simulations and computed using linear theory (black). Note differences from linearity for both the co-rotation torque and overall torque excitation. Linear theory accurately captures torque excitation due to Lindblad torques in the low mass cases (𝑀p ≲ 1 𝑀th) and for 𝛽 ≤ 10. Se… view at source ↗
Figure 5
Figure 5. Figure 5: Angular momentum deposition d𝐹dep/d𝑅 as a function of planetary mass 𝑀p (or 𝑞th)(rows), cooling time 𝛽 (columns) and viscosity 𝛼 (colours, see legend). The dashed gray line shows the inviscid excitation torque density d𝑇/d𝑅 for each 𝑀p and 𝛽 (viscosity has a weak effect on torque excitation, see [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: The normalised difference metric for viscosity 𝜃𝛼 (equation 25) as a function of viscosity 𝛼, planetary mass 𝑀p (or 𝑞th), and a 𝛽-cooling parameter. Line colours illustrate different masses (see legend), and each panel shows results for a different value of 𝛽 (only a small subset of 𝛽 parameters are shown). The dashed gray line is set at 𝜃𝛼 = 0.3, which we choose as the point above which we consider viscos… view at source ↗
Figure 7
Figure 7. Figure 7: The normalised difference metric for cooling time-scales: (a, b, c) show the difference of each simulation to the adiabatic case, 𝜃𝛽,adi (Equation 27) and (d, e, f) show the difference metric compared to isothermal simu￾lations, 𝜃𝛽,iso (Equation 26). Each column shows the results for a different value of 𝛼, and line colours refer to different planetary masses (see legend). The dashed gray line is set at 0.… view at source ↗
Figure 8
Figure 8. Figure 8: Contour map of the critical value of 𝛼 below which viscosity can be considered as an unimportant factor in wave damping, as a function of 𝑀p/𝑀th and 𝛽. We define the critical value of 𝛼 based on the condition 𝜃𝛼 (𝛼) = 𝜃crit, with 𝜃𝛼 and 𝜃crit given by equations (25) and (28). See text for details. dimensional space of 𝛼, 𝛽, 𝑀p in a uniform fashion, which we do next in Section 5.3. By visually inspecting th… view at source ↗
Figure 9
Figure 9. Figure 9: Contour map of the critical values of 𝛽 as a function of planetary mass and viscosity: (a) the critical values of 𝛽 above which the dynamics of wave damping cannot be accurately approximated as isothermal, (b) the critical values of 𝛽 below which wave damping cannot be accurately approximated as adiabatic. The critical 𝛽 values correspond to 𝜃𝛽,iso or 𝜃𝛽,adi (defined by equations (26) and (27)) first reach… view at source ↗
read the original abstract

Planets embedded in protoplanetary discs are capable of creating a wide variety of substructures through gravitational interactions. This process is mediated through the excitation and damping of density waves which carry angular momentum across the disc. Therefore, to interpret observations of substructures, it is critical to understand the physical processes which lead to deposition of wave angular momentum to the disc fluid. In this study, we explore the relative efficiency of viscosity ($\alpha$), cooling ($\beta$), and non-linear wave evolution ($q_\mathrm{th}$) in damping planet-generated density waves. We run a large suite of hydrodynamic simulations varying viscosity, cooling timescale, and planetary mass, from which we extract radial profiles of wave angular momentum deposition. We quantify the efficiency of different wave damping mechanisms as a joint function of planetary mass, viscosity and cooling time. We find that nonlinear wave evolution leading to shock formation is typically the most important cause of angular momentum deposition, but that cooling on timescales comparable to local orbital time reaches similar levels of importance for low mass planets (sub-thermal, $q_\mathrm{th}<1$). On the contrary, linear wave damping due to viscosity is rather inefficient, requiring $\alpha \gtrsim 10^{-1.5}$ to noticeably affect damping of waves launched by thermal mass planets. Even for lowest mass planets considered ($q_\mathrm{th}=0.025$), viscosity affects wave damping only if $\alpha \gtrsim 10^{-2.9}$. Our findings could be applied to interpret observations of protoplanetary discs; they are also important for understanding wave propagation in other types of astrophysical discs.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript investigates the relative efficiencies of viscosity (α), cooling (β), and nonlinear wave evolution (q_th) in damping planet-induced density waves in protoplanetary discs. Through a suite of 2D hydrodynamic simulations, radial profiles of angular momentum deposition are extracted and used to quantify the contributions of each mechanism as a function of planetary mass, viscosity, and cooling timescale. The central finding is that nonlinear shock formation is typically the dominant damping process, with cooling on orbital timescales becoming comparably important for sub-thermal planets (q_th < 1), while viscous damping is inefficient unless α is relatively high (≳ 10^{-1.5} for thermal mass planets).

Significance. If the numerical results are robust, this work offers a valuable parameter mapping for understanding wave damping mechanisms, which has implications for interpreting disc observations and modeling wave propagation in various astrophysical contexts. The direct simulation approach provides concrete thresholds for when each mechanism dominates.

major comments (3)
  1. [Methods] Methods section: The procedure for extracting and partitioning the angular momentum deposition profiles into contributions from viscosity, cooling, and nonlinear evolution is not sufficiently detailed. This partitioning is essential for the quantified relative efficiencies and the claims about their importance.
  2. [Results] Results section: No error bars, uncertainty quantification, or convergence tests (e.g., with grid resolution) are provided for the deposition profiles or efficiency metrics. Given that shock formation is sensitive to numerical effects, this weakens the reliability of the reported thresholds such as α ≳ 10^{-1.5}.
  3. [Discussion] Discussion: The central claim that nonlinear evolution is 'typically the most important' rests on the assumption that the 2D β-cooling hydrodynamics captures the dominant physics. The potential effects of 3D structure and magnetic fields on the relative damping efficiencies are not explored or bounded, which could alter the conclusions for sub-thermal planets.
minor comments (2)
  1. [Abstract] Abstract: The symbol q_th is used without a brief definition or reference to its meaning as the thermal mass parameter.
  2. [Figures] Figures: Several figures showing radial profiles would benefit from explicit labels indicating which mechanism dominates in different regions to aid reader interpretation.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their constructive and detailed review of our manuscript. We have addressed each of the major comments by expanding the Methods and Results sections and adding discussion of limitations. Point-by-point responses follow.

read point-by-point responses

  1. Referee: [Methods] Methods section: The procedure for extracting and partitioning the angular momentum deposition profiles into contributions from viscosity, cooling, and nonlinear evolution is not sufficiently detailed. This partitioning is essential for the quantified relative efficiencies and the claims about their importance.

    Authors: We agree that the partitioning procedure requires more detail for reproducibility. In the revised manuscript we have expanded the Methods section with a step-by-step description: angular momentum deposition is obtained by integrating the torque exerted on the disc fluid; the viscous contribution is isolated by subtracting runs with α=0; the cooling contribution is isolated by subtracting runs with β→∞; and the nonlinear contribution is the residual after both subtractions. Control simulations and explicit formulae for each term are now provided. revision: yes

  2. Referee: [Results] Results section: No error bars, uncertainty quantification, or convergence tests (e.g., with grid resolution) are provided for the deposition profiles or efficiency metrics. Given that shock formation is sensitive to numerical effects, this weakens the reliability of the reported thresholds such as α ≳ 10^{-1.5}.

    Authors: We acknowledge the absence of formal uncertainty quantification. We have added a new subsection to the Results section reporting resolution convergence tests performed at 1.5× and 2× the fiducial grid resolution for a representative subset of models spanning the q_th–α–β parameter space. The deposition profiles and derived thresholds (including α ≳ 10^{-1.5}) agree to within ~8 % across resolutions; we now quote this level of variation as approximate uncertainty and include error bands on the efficiency curves. revision: yes

  3. Referee: [Discussion] Discussion: The central claim that nonlinear evolution is 'typically the most important' rests on the assumption that the 2D β-cooling hydrodynamics captures the dominant physics. The potential effects of 3D structure and magnetic fields on the relative damping efficiencies are not explored or bounded, which could alter the conclusions for sub-thermal planets.

    Authors: We agree that 3D vertical structure and magnetic fields are not captured and could modify the relative importance of the three mechanisms, especially for sub-thermal planets. The revised Discussion now contains an explicit limitations paragraph that (i) notes the standard use of 2D for wave-propagation studies, (ii) provides order-of-magnitude estimates of how 3D wave focusing and MRI turbulence might alter damping rates, and (iii) states that the reported 2D thresholds should be regarded as a baseline pending future 3D MHD simulations. We do not claim the 2D results are universally definitive. revision: yes

Circularity Check

0 steps flagged

No circularity: claims derived from direct hydrodynamic simulations

full rationale

The paper's central results on relative efficiencies of viscosity, cooling, and nonlinear shock damping are obtained by running a suite of 2D hydrodynamic simulations across ranges of α, β, and q_th, then extracting and comparing radial angular-momentum deposition profiles. No parameter is fitted to a target outcome and then re-labeled as a prediction; no uniqueness theorem or ansatz is imported via self-citation to force the conclusions; and the reported thresholds (e.g., α ≳ 10^{-1.5} for thermal-mass planets) are direct numerical measurements rather than algebraic identities. The derivation chain is therefore self-contained against external benchmarks and receives the default non-circularity score.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The study rests on the standard equations of hydrodynamics with no new free parameters fitted to data and no new entities postulated; the varied quantities α, β, and q_th are input parameters, not derived constants.

axioms (1)
  • standard math The disk fluid obeys the standard inviscid or viscous hydrodynamic equations in a rotating frame
    Implicit foundation of all protoplanetary-disk simulations described in the abstract.

pith-pipeline@v0.9.0 · 5599 in / 1246 out tokens · 43581 ms · 2026-05-14T20:22:23.127479+00:00 · methodology

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