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REVIEW 3 major objections 4 minor 68 references

Effects of Thermodynamics on the Concurrent Accretion and Migration of Gas Giants in Protoplanetary Disks

T0 review · 3 major / 4 minor · reviewed 2026-08-10 · deepseek-v4-flash

Pith's one-line read Efficient cooling makes an accreting gas giant migrate outward; slow cooling makes it migrate inward, with the switch at β≈1.

desk verdict A solid parameter study of accretion and migration with beta-cooling, but the headline beta~1 transition is not yet robust because torque convergence is unverified and the beta grid is coarse. read the letter →

arxiv 2501.15874 v1 pith:7JDYS3AH submitted 2025-01-27 astro-ph.EP

classification astro-ph.EP
keywords protoplanetarydisksplanetmigrationcircumplanetarydiskplanetaryaccretionbeta-coolingprescriptiongasgiantformationplanet-diskinteraction
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper tries to establish that the thermodynamic state of the gas around an accreting giant planet—specifically how rapidly it can cool—controls whether the planet migrates inward or outward while it is still growing. In 2D global hydrodynamic simulations of a Jupiter-mass planet in a protoplanetary disk, the authors vary a single thermal-relaxation timescale and find that efficient cooling produces a rotationally supported, asymmetric circumplanetary disk whose positive torque pushes the planet outward, whereas slow cooling makes the circumplanetary envelope nearly symmetric and lets the negative torque from the outer disk pull the planet inward. The switch occurs near the point where the cooling timescale equals the local dynamical timescale ($\beta \sim 1$). A sympathetic reader would care because migration direction decides where gas giants end up, and the result says that local disk cooling—not just planet mass and disk viscosity—can determine that final orbit. It also gives a concrete target for radiative-hydrodynamic simulations to confirm or refute.

What carries the argument

The central object is the circumplanetary disk (CPD), the gas structure inside the planet's Hill sphere, whose azimuthal asymmetry sets the sign of the gravitational torque. The paper controls thermodynamics with a $\beta$-cooling prescription in which the internal energy relaxes toward its initial profile on a timescale $\beta/\Omega$, with $\Omega$ the local Keplerian frequency; low $\beta$ approaches the isothermal limit and high $\beta$ approaches the adiabatic limit. The load-bearing diagnostic is the spatial asymmetry of the gravitational torque, $\Gamma(r,\phi)+\Gamma(r,-\phi)$, integrated within the Hill sphere: efficient cooling leaves a prograde, asymmetric CPD with a net positive torque, while slow cooling replaces it with a nearly isotropic, pressure-supported envelope whose positive torque vanishes and whose flow can even become retrograde.

What would settle it

Run a radiative-hydrodynamic simulation of an accreting Jupiter-mass planet with wavelength-dependent cooling and measure the torque inside one Hill radius; if a rotationally supported, asymmetric circumplanetary disk—and its associated positive torque—survives even when the effective cooling time exceeds the local orbital time, the $\beta \approx 1$ migration transition predicted here is an artifact of the cooling prescription.

Watch

Extended reading notes

Core claim

The central claim is that for an accreting Jupiter-mass planet on a circular orbit in a viscous protoplanetary disk, the direction of migration is set by the cooling timescale of gas inside the planet's Hill sphere. In the isothermal limit and for $\beta \lesssim 0.1$, the gas forms a rotationally supported, nearly Keplerian circumplanetary disk whose density and torque distributions are asymmetric: the leading side exerts a stronger positive torque than the trailing side exerts negative torque, and this positive contribution overcomes the negative differential Lindblad torque from the outer disk, so the planet migrates outward. As the cooling timescale lengthens, the circumplanetary disk shrinks and becomes less rotationally supported; at $\beta \gtrsim 10$ it is replaced by a pressure-supported, more spherical envelope whose rotation can even become retrograde, the torque asymmetry nearly vanishes, and the planet migrates inward. The total torque crosses zero around $\beta \sim 1$, when the cooling time is comparable to the local dynamical time. The paper also reports a mild decline in the planetary accretion rate with increasing $\beta$, with accretion still limited by the mass supply from the outer disk and driven chiefly by spiral-shock (Reynolds) stress in the circumplanetary region.

Load-bearing premise

The results depend on the assumption that one single cooling timescale, set by the parameter $\beta$, faithfully represents how the gas around the planet loses heat; if real cooling inside the planet's Hill sphere differs from this simple relaxation, the predicted switch near $\beta \approx 1$ could shift or disappear.

Editorial extensions

If this is right

  • In disk regions where the local cooling time is shorter than the orbital time, an accreting Jupiter-mass planet should migrate outward, so efficient cooling changes the expected final orbital radius.
  • Where cooling is slow ($\beta \gtrsim 10$), the same planet migrates inward at a rate roughly three times slower than the classical type I/II estimate for a non-accreting planet.
  • Long cooling timescales also reduce the planet's accretion rate slightly and can drive the circumplanetary gas into retrograde rotation, which would alter how regular satellites form around the planet.
  • Because migration torque depends on thermodynamics, population-synthesis models of gas giants need to include local cooling conditions, not just disk mass and viscosity, to predict where planets park.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the $\beta \sim 1$ transition holds under more realistic radiative transfer, then a single disk could drive the same planet outward in its outer, efficiently cooling region and inward in its inner, slowly cooling region, suggesting a thermodynamic channel for parking gas giants at intermediate or large radii.
  • The retrograde circumplanetary flow seen at $\beta \gtrsim 10$ implies a thermodynamic criterion for satellite formation: regular satellites may form only where cooling is fast enough to sustain a prograde CPD, a prediction that could be tested with CPD-scale simulations.
  • Because the paper fixes the planet on a circular orbit and uses one mass and viscosity, the natural next step is to let the planet move freely and vary mass, viscosity, and eccentricity; the claim predicts that the torque transition should track the local cooling-to-dynamical timescale ratio across that parameter space.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. The manuscript reports 2D global hydrodynamical simulations, using Athena++, of a Jupiter-mass planet accreting from a viscous protoplanetary disk with a β-cooling prescription that relaxes the internal energy toward the initial disk profile. The runs are evolved for 20,000 orbits, and the authors demonstrate that the circumplanetary disk (CPD) accretion reaches a quasi-steady state via mass-flux and angular-momentum budget checks. The paper finds that longer cooling times slightly reduce the planetary accretion rate and change the CPD from a rotationally supported prograde disk (β ≲ 0.1) to a pressure-supported, partially retrograde envelope (β ≳ 10). The central migration claim is a torque-sign transition: the total torque on the planet is positive for efficient cooling and negative for inefficient cooling, with the abstract stating that the transition occurs near β ∼ 1 and attributing it to the disappearance of asymmetric CPD structures that provide a positive torque.

Significance. Concurrent accretion and migration is an important coupling that has only recently been studied self-consistently, and this paper is the first to add a thermodynamic parameter sweep in global 2D simulations. The numerical setup is standard, the runs are long enough to reach a viscous quasi-steady state, and the steady-state interpretation is supported by independent mass-flux and angular-momentum budget checks. If the torque-sign transition is confirmed, it would have direct implications for giant-planet migration and for accreting compact objects in AGN disks. The main weakness is that the load-bearing torque measurements are not covered by the reported convergence tests and the β grid is too coarse to locate the transition robustly; these issues are fixable with additional analysis or simulations.

major comments (3)
  1. [Section 2.3, Fig. 7, and Appendix A] The convergence tests in Appendix A (Fig. A1) validate only the accretion rate ṁ_p; they do not test the gravitational torque whose sign is the paper's central result. The positive torque originates inside ~0.2 r_h (Fig. 9), where the Hill sphere is resolved by only ~20 cells per dimension at the adopted 4-level refinement, so a resolution-dependent change in the inner CPD spiral-arm asymmetry could in principle flip the sign of the integrated torque. Please run the β = 1 convergence cases (5-level refinement, different racc and f, and the high-resolution FARGO3D cases) and report the total gravitational torque, the radial torque profile, and the torque asymmetry Γasy for each; if the torque is not converged, the abstract's β ∼ 1 transition is not established even within the adopted β-cooling model.
  2. [Section 2.3, Fig. 7, and Abstract] The transition 'β ∼ 1' is an interpolation across the widest empty interval in the parameter grid: the runs are at β = 0.01, 0.1, 1, 10, 100, and no run lies between β = 1 and β = 10. The total torque points are shown without any time-variability information, despite the strong short-term fluctuations noted for the high-β runs (Fig. 1 and the running averages used in Fig. 6). Please add intermediate β values (e.g., β = 2, 3, 5) and report time-averaged torques with standard deviations or percentile ranges. Until then, the text should state that the crossing lies between β = 1 and β = 10, not at β ∼ 1.
  3. [Section 2.4, Figs. 8 and 9] The causal mechanism—that the sign change is driven by the disappearance of the asymmetric, rotationally supported CPD—is illustrated only for the two end-member cases (isothermal and β = 100). No quantitative measure of CPD asymmetry as a function of β is provided, so the correlation with the torque sign at intermediate β is not demonstrated. Please add a quantitative asymmetry diagnostic (e.g., Γasy integrated inside the Hill sphere, or the m = 1 Fourier amplitude of the density within ~0.2 r_h) for all runs, or show the torque maps for β = 1 and β = 10.
minor comments (4)
  1. [Section 2.3] In the sentence 'with Γtot > 0 for β ≲ 1 and Γtot < 0 for β1', the second inequality is missing its symbol; it should read 'β ≳ 1'.
  2. [Section 2.1] The text refers to the sound-speed profile as being shown in 'the right panel of Figure 2', but the sound-speed panel is the right panel of Figure 3; the cross-reference should be corrected.
  3. [Section 2.2, Eq. (13)] The quantity C is called a 'constant free parameter', but as an integration constant in Eqs. (9)–(10) it is fixed by the boundary condition at the accretion radius; please reword to avoid implying an additional adjustable parameter.
  4. [Throughout] There are several typographical errors that should be corrected, including 'lunched' for 'launched', 'spacial' for 'spatial', and 'aα−viscosity' for 'an α-viscosity'.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the torque-sign transition is a measured simulation outcome, not a fitted or self-referential quantity; the acknowledged β-cooling limitation is a modeling caveat, not a circular reduction.

full rationale

The paper is a numerical parameter study: the central claim that β≲1 produces outward migration and β≳10 inward migration is read off the simulated gravitational and accretional torques (Eqs. 15–16), which are computed from the evolving density field rather than imposed by the cooling prescription. The β-cooling law (Eq. 4) is an input ansatz, explicitly conceded in the Conclusions ('rather than relying on the β-cooling prescription'), so the acknowledged lack of radiative transfer is a validity limitation, not circularity. The isothermal baseline is reproduced in the same code and independently supported by Laune et al. (2024), so the frequent references to the authors' own Li et al. (2024) for setup and torque decomposition are methodological inheritance rather than load-bearing evidence for the new thermodynamic branch. The only notable gaps—Appendix A validates accretion rates but not the torque sign, and no simulation lies between β=1 and β=10—are robustness concerns; they do not make any derived quantity equal to an input by construction. No equation defines torque in terms of β, and no fitted parameter is relabeled as a prediction.

Assumptions & free parameters 4 free parameters · 5 assumptions · 0 invented entities

The central claim rests on standard numerical domain assumptions: thin 2D disk, Shakura-Sunyaev viscosity, fixed circular orbit, sink prescription, and beta-cooling relaxation toward the initial profile. These are explicitly stated or acknowledged as limitations. No new physical entities, particles, or forces are introduced.

free parameters (4)
  • Constant C in alpha_con (Eq. 13) = not stated
    Introduced in the angular momentum decomposition for the accretion coefficient alpha_con; the paper says it is a constant free parameter associated with the accretion boundary but does not give its value or fitting procedure.
  • Sink radius racc = 0.1 rh
    Chosen for numerical practicality and tested in Appendix A; not derived from physics.
  • Removal rate f = 5 Omega
    Sink prescription parameter following Li et al. (2024); convergence tested in Appendix A.
  • Potential softening s = 0.1 rh
    Gravitational softening length chosen and tested in Appendix A.
assumptions (5)
  • domain assumption beta-cooling relaxation (Eq. 4) represents disk thermodynamics
    The entire parameter study varies beta while relaxing internal energy toward the initial profile; the authors acknowledge radiative hydrodynamics may change the CPD structure and torque.
  • domain assumption 2D thin-disk approximation (h = 0.05) is adequate
    Simulations are 2D; the authors state that the extent of 3D effects with beta-cooling remains unclear.
  • domain assumption Shakura-Sunyaev alpha viscosity with alpha = 0.01
    The disk is laminar and viscous; magnetic turbulence may modify spiral waves and torques, as conceded in the Conclusions.
  • domain assumption Fixed circular orbit with post-processed torques
    The planet is held on a circular orbit and migration is inferred from torques; accreted mass and angular momentum are not added back to the planet.
  • domain assumption Non-self-gravitating disk
    Disk self-gravity is neglected; the paper does not assess its effect on the reported torques.

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Pith. "Pith review of Effects of Thermodynamics on the Concurrent Accretion and Migration of Gas Giants in Protoplanetary Disks." pith.science (2026). https://pith.science/paper/7JDYS3AH

@misc{pith2026250115874,
  author       = {Pith},
  title        = {Pith review of: Effects of Thermodynamics on the Concurrent Accretion and Migration of Gas Giants in Protoplanetary Disks},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/7JDYS3AH}},
  note         = {Machine review of arXiv:2501.15874}
}
abstract

Accretion and migration usually proceeds concurrently for giant planet formation in the natal protoplanetary disks. Recent works indicate that the concurrent accretion onto a giant planet imposes significant impact on the planetary migration dynamics in the isothermal regime. In this work, we carry out a series of 2D global hydrodynamical simulations with Athena++ to explore the effect of thermodynamics on the concurrent accretion and migration process of the planets in a self-consistent manner. The thermodynamics effect is modeled with a thermal relaxation timescale using a $\beta$-cooling prescription. Our results indicate that radiative cooling has a substantial effect on the accretion and migration processes of the planet. As cooling timescales increase, we observe a slight decrease in the planetary accretion rate, and a transition from the outward migrating into inward migration. This transition occurs approximately when the cooling timescale is comparable to the local dynamical timescale ($\beta\sim1$), which is closely linked to the asymmetric structures from the circumplanetary disk (CPD) region. The asymmetric structures in the CPD region which appear with an efficient cooling provide a strong positive torque driving the planet migrate outward. However, such a positive torque is strongly suppressed, when the CPD structures tend to disappear with a relatively long cooling timescale ($\beta\gtrsim10$). Our findings may also be relevant to the dynamical evolution of accreting stellar-mass objects embedded in disks around active galactic nuclei.

Figures

Figures reproduced from arXiv: 2501.15874 by the authors.

Figure 1
Figure 1. The left panel displays the running time-averaged planetary accretion rates in a locally isothermal disk and disks with varying β-cooling timescales, measured in unit of Σ0r 2 0Ω0. The black dashed line indicates the material supply rate from the outer boundary. The right panel illustrates the short-term fluctuations in accretion rates for several representative simulations, without any time averaging [PITH_FULL_IM… view at source ↗
Figure 2
Figure 2. The density distribution δΣ in the vicinity of the planet with different cooling timescales. δΣ = Σ − ⟨Σ⟩ where ⟨Σ⟩ is the azimuthally averaged surface density from the perturbed disk at the same orbital time. The arrows in the plots represent the velocity vectors relative to the planet. All plots are presented at 20000 orbits. For the cases with β = 10 and β = 100, time averages over 100 and 500 orbits, respectivel… view at source ↗
Figure 3
Figure 3. Left panel: the azimuthally-averaged rotation velocity relative to the planet for different models in unit of the local Keplerian velocity orbiting around the star. The black line represents the Keplerian rotation velocity around the planet. Middle panel: the surface density profile around the planet in unit of Σ0. Right panel: the azimuthally-averaged sound speed cs in the vicinity of the planet in code unit. To fa… view at source ↗
Figures from the paper (6 more)
Figure 4
Figure 4. Figure 4: Different accretion coefficient calculated by Equation 10 under isothermal EOS (left panel) and β = 100 (right panel) cases. The the summation of αrey, αcon and αT is shown as red lines [PITH_FULL_IMAGE:figures/full_fig_p008_4.png]
Figure 5
Figure 5. Figure 5: Left panel: the effective accretion coefficients in Equation 11 under different cooling timescales. Right panel: the accretion coefficients resulting from Reynolds stress(αrey; solid lines) and external forces (αT; dashed lines) for different cooling timescales. The sa…
Figure 6
Figure 6. Figure 6: The semi-major axis evolution due to the gravitational (blue lines), accretional (red lines) and total (black lines) torques in isothermal (left panel) and β = 100 (right panel) cases. For the case of β = 100, a running-time averaged over 500 orbits is carried out to s…
Figure 7
Figure 7. Figure 7: The torque exerted on the planet under different cooling timescales in code unit, where ℓ0 = r 2 0Ω0 is the specific angular momentum of the disk at r0. The blue and red circle points represent the gravitational torque and accretional torque respectively. The black squ…
Figure 8
Figure 8. Figure 8: Spacial distribution of gravitational torques in the vicinity of the planet around 20000 orbits. The upper panel represents the isothermal condition and the lower panel shows the β = 100 case. A time-averaging over 500 orbits is done for the β = 100 case. The contour i…
Figure 9
Figure 9. Figure 9: The cumulative radial distribution (integration from rin to r) of the gravitational torque exerted onto the planet, where the blue (red) line represents the isothermal (β = 100) case. The torque for β = 100 is time-averaged over 500 orbits around 20000 orbits. The two …

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