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REVIEW 3 major objections 4 minor 157 references

Terrestrial Planet Formation from Two Source Reservoirs

T0 review · 3 major / 4 minor · reviewed 2026-08-06 · deepseek-v4-flash

Pith's one-line read Two separate planetesimal reservoirs — an inner ring near 0.5 au and an outer source at 1.5–2 au — can produce the terrestrial planets, with outward Type-I migration carrying Venus and Earth outward while Mars is the lone survivor of the…

desk verdict A serious and systematic simulation study with a genuinely new two-source architecture, but the Mars isotope claim is internally contradicted by the paper's own admitted composition numbers. read the letter →

arxiv 2507.14814 v1 pith:PR3DDYUW submitted 2025-07-20 astro-ph.EP

classification astro-ph.EP
keywords terrestrialplanetformationtwo-sourcereservoirmodelType-ImigrationmagneticallydrivenwindssilicatesublimationlineplanetesimalringsinnersolarsystemMars
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 claims that the terrestrial planets assembled from two distinct planetesimal reservoirs rather than a single radially extended disk. In the reference model (model203), an inner ring at about 0.6 au — where planetesimals would form near the silicate sublimation line — supplies Mercury, Venus, and Earth, while a second, broader source at 1.5–2 au supplies Mars and many Mars-sized bodies that mostly fall onto Earth. Outward Type-I migration driven by a magnetically-wind-like gas disk with a surface-density bump near 1 au carries Venus and Earth to their present orbits and leaves Mercury behind near the ring. The model matches all four terrestrial-planet criteria in 6.1% of 1,000 simulations, produces Earth with about 70% inner-ring (reduced) and 30% outer-source (oxidized) material, and gives Mars a distinct outer-source composition, explaining the Earth-Mars isotopic difference and suggesting Theia shared Earth's accretion history.

What carries the argument

The load-bearing mechanism is torque-driven migration in a gas disk with a surface-density bump: the paper writes the gas surface density as $\Sigma_g = \Sigma_0 (r/r_0)^{\beta(r)} e^{-t/\tau}$ with $\beta(r)=\beta_1 \ln(r/r_0)+\beta_2$, choosing $\beta_1=-1$, $\beta_2=0$, $\Sigma_0=3000$ g cm$^{-2}$, $r_0=0.9$ au. This makes the local slope $\partial \ln \Sigma/\partial \ln r$ positive inside about 1.2 au, so protoplanets of roughly 0.1–1 Earth mass experience an outward torque and drift toward the zero-torque radius near 1 au. The inner planetesimal ring at 0.5–0.6 au is the nursery: the most massive embryos grow, migrate out, and concentrate at 0.7–1 au, while lower-mass Mercury stays behind. A second reservoir at 1.5–2 au feeds Mars and, through inward migration, supplies about 30% of Earth's mass later. A giant-planet instability at about 11 Myr breaks the resonant chains formed in the disk and triggers the late giant-impact stage.

What would settle it

A concrete test is to measure or compute the radial gas-density profile of a protoplanetary disk inside 1.2 au and check whether its local slope $\partial \ln \Sigma/\partial \ln r$ is positive there. If observations or detailed disk models that include magnetic winds show a monotonically decreasing density with no inner bump, the outward-migration regime disappears; embryos formed near 0.5 au would migrate inward by Lindblad torques and would not end up at the Venus-Earth separation seen in the reference model.

Watch

Extended reading notes

Core claim

The central discovery is that a two-source initial condition, not a single annulus or an extended disk, best explains the modern terrestrial system. With an inner ring at $r_1 = 0.6$ au ($\sigma_1 = 0.05$ au), an outer reservoir at $r_2 = 1.7$ au ($\sigma_2 = 0.1$ au), total initial mass 2.1 Earth masses split 2:1 between inner and outer sources, and a gas disk whose surface density flattens or rises with radius inside about 1.2 au ($\Sigma_0 = 3000$ g cm$^{-2}$ at $r_0 = 0.9$ au, $\beta_1 = -1$, $\beta_2 = 0$), the simulations produce good Venus/Earth pairs in 50% of runs, good Mars in 35%, good Mercury in 32%, and tight Venus/Earth separation in 33%; 6.1% of runs satisfy all four criteria simultaneously. In those runs Earth accretes about 70% of its mass from the inner ring and about 30% from the outer source, while Mars accretes about 90% from the outer source. The paper argues that this accretion sequence matches the reduced-then-oxidized chemistry inferred for Earth's mantle, the distinct isotopic building blocks of Mars, and the Earth-like isotopic composition of the Moon, because Theia would have grown in the same inner reservoir and on a similar timescale as the proto-Earth.

Load-bearing premise

The load-bearing premise is that the protoplanetary gas disk had a density profile that pushed newborn planets outward inside about 1.2 au; if real disks instead pushed them inward, Venus and Earth would never move from the 0.5 au nursery out to 0.7–1 au and the inner-ring story fails.

Editorial extensions

If this is right

  • Mercury's small mass and orbit are a natural by-product: the inner ring is narrow and the most massive embryos migrate outward, leaving a low-mass planet behind near 0.5 au.
  • Earth's mantle composition and the Earth-Mars isotopic difference are explained by the same mass split: about 70% inner-ring (reduced) and 30% outer-source (oxidized) material for Earth, and about 90% outer-source material for Mars.
  • Theia, the Moon-forming impactor, plausibly grew from the same inner reservoir on a similar schedule as the proto-Earth, explaining the Earth-Moon isotopic similarity without special orbital or mixing assumptions.
  • Inner-ring planetesimals should be absent from the meteorite collection, because their implantation efficiency into the asteroid belt is estimated to be below about $3 \times 10^{-7}$.
  • The best-fit model implies a gas disk with an inner density bump, most naturally produced by magnetically driven winds, and an early giant-planet instability at about 11 Myr; both are testable predictions for disk and planet-formation models.

Reading between the lines

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

  • A testable extension, not made in the paper: the same disk profile that pushes terrestrial embryos outward near 1 au is also invoked for close-in super-Earth formation, so a unified disk evolution model could tie the terrestrial ring to the super-Earth population and predict their relative formation timescales.
  • If the inner-ring reservoir is truly unsampled in meteorites, future samples from Mercury or the near-Sun small-body population should carry the reduced, refractory-enriched signature of the inner ring rather than ordinary-chondrite-like material.
  • The model's rapid assembly of Mars from the 1.5–2 au source implies measurable consequences for Mars' volatile and siderophile budgets; Mars sample-return measurements of tungsten and noble gases could test whether the last large impactor came from that outer reservoir.
  • The 6.1% all-good success rate is based on N = 400 super-particles; repeating the reference model with several thousand bodies would show whether the stated success probability is stable or partly a resolution artifact.
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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 paper presents a large suite of N-body simulations of terrestrial planet formation starting from planetesimal disks with one or two radial reservoirs, a gas disk stage with Type-I migration and aerodynamic drag, a giant-planet instability, and a long late-stage integration. The authors explore roughly one hundred model configurations with one thousand simulations each and grade outcomes against objective criteria for Mercury, Venus/Earth, Mars, and the Venus-Earth separation. Their preferred two-source model (model203), with an inner ring at 0.6 au and an outer source at 1.7 au, yields success rates (V/E, Mars, Merc, V/E Sep) = (50%, 35%, 32%, 33%) and 6.1% of runs satisfying all four criteria. The paper claims that this model explains the masses and orbits of the terrestrial planets, the reduced/oxidized accretion history of Earth, and the isotopic differences between Earth and Mars, and that it provides a plausible accretion history for the Moon-forming impactor Theia.

Significance. If the central claims hold, this would be a substantial advance: the paper demonstrates that a two-reservoir initial condition plus outward Type-I migration in a wind-like disk can simultaneously match the radial mass concentration, the Mercury problem, the small-Mars problem, and the Earth's bimodal accretion chemistry. The statistical methodology is a clear strength: one thousand simulations per model, objective planet-matching criteria defined in Section 3.1, and systematic parameter variation with results tabulated in Tables 1 and 2. The fragmentation tests in Section 4.10 and the resolution checks with N=1000 and N=2000 are also valuable. However, the paper's third headline claim, that it explains the isotopic differences of Earth and Mars, is contradicted by the authors' own quantitative caveat in Section 5, and the Earth's 70/30 composition is largely built into the chosen mass split. The central mechanism also rests on a parameterized disk profile rather than a self-consistent disk model. These issues make the paper's central conclusion conditional rather than established.

major comments (3)
  1. [Section 5 and Section 3.2.3] There is an internal inconsistency between the abstract and the quantitative Mars composition. The abstract states that the model explains 'the isotopic differences of the Earth and Mars,' and Section 4.9 and Conclusion item 6 repeat this claim. However, Section 5 states that with the 2:1 mass split, 'Mars accretes ~90% of material from the outer source... This composition would not have enough EC material to explain observations.' Given the constraints quoted in Section 3.2.3 (Mars ~65% EC, Earth ~95% EC) and the tentative mapping of the inner ring to EC and outer source to OC, model203 predicts Mars to be ~90% OC and ~10% EC, which is the opposite of the inferred EC-dominated Mars. The model can produce two isotopically distinct planets, but it does not reproduce the specific EC/OC mixture inferred for Mars. This gap must be closed, either by an explicit treatment of an unsampled reservoir, by a different assignment of isotopic reservoirs to the two source rings, or by softening the claim in the abstract and conclusions.
  2. [Section 4.8, Eq. (2), and Table 2] The Earth's ~70% inner and ~30% outer composition is largely a consequence of the chosen 2:1 mass split (w2 = 1/3 in Eq. (2)), not an independent prediction of the model. The authors state in Section 3.2.1 that the 70/30 chemical split is itself one of the geochemical constraints motivating a two-source model, and Section 5 notes that the 2:1 split 'would represent the best match to the chemical composition of the BSE.' Since model203 was selected as the best among roughly one hundred tested configurations, at least partly with this compositional prior in mind, the claimed match to the Earth's chemistry is partially circular. The paper should quantify the Earth composition for the other mass splits reported in Table 2 (model211 with w2=1/2 and model212 with w2=1/4), and demonstrate that the 70/30 outcome is not simply read off from the initial mass ratio.
  3. [Section 2.2.2 and Eq. (9)] The central dynamical mechanism relies on a parameterized gas disk profile, Eq. (9) with beta1 = -1, beta2 = 0, and Sigma0 = 3000 g/cm^2, which produces outward Type-I migration inside ~1.2 au. The authors acknowledge that this is a simple parameterization 'that roughly approximated the results of MHD simulations,' but it is load-bearing: Section 4.6 shows that without this outward migration the inner-ring model does not place Venus and Earth at 0.7-1 au, and Section 4.8 uses the same profile for the reference model. The height of the density bump and the zero-torque radius are not derived from a self-consistent disk model, and the paper does not explore time-dependent beta1 and beta2 even though the cited MHD simulations show the profile evolving. The authors should either provide a more direct connection to published MDW disk calculations, including a range of plausible profiles and evolution histories, or explicitly frame the results as conditional on this assumed disk structure.
minor comments (4)
  1. [Section 6, Conclusion item 5] The sentence 'the best results were obtained with 1.4 MEarth in the inner ring and 0.7 MEarth in the inner ring' should read '0.7 MEarth in the outer ring;' otherwise it misstates the mass split that defines model203.
  2. [Table 1, model mmsn] The Notes column describes a gas disk with 'alpha0 = -1,' but the relevant parameter appears to be the power-law index beta in Eq. (8), not alpha0; the notation should be corrected for consistency with Section 4.4.
  3. [Title page and affiliations] The affiliation for the Nice group contains a typo: 'Bouldervard de l'Observatoire' should be 'Boulevard de l'Observatoire.'
  4. [Section 4.9] The claim that late accretion estimates are unreliable because each initial planetesimal has mass ~0.5% of Earth, comparable to the HSE-inferred late veneer, is clearly stated, but it would be helpful to also state whether the N=1000 and N=2000 resolution runs reported later in the section were used to assess this specific quantity, since those runs are said to give nearly identical results.

Circularity Check

2 steps flagged · score 6.0 of 10

The dynamical simulations are self-contained, but the Earth 70/30 chemical explanation reduces to the chosen 2:1 mass split, and the abstract's Mars-isotope claim is contradicted in Section 5.

  1. fitted input called prediction [Section 4.8 (model203 parameters) and Section 4.9 / Section 5 (Earth composition)]
    "The initial mass was partitioned between the two rings such that there is the mass m1 = 1.4 MEarth in the inner ring and the mass m2 = 0.7 MEarth in the outer source (w2 = 1/3 in Eq. 2). ... For the 2:1 mass split between the inner and outer sources (w2 = 1/3 in Eq. 2), we find that the Earth accretes ∼ 70% of material from the inner ring and ∼ 30% of material from the outer source (Fig. 13A). This case would represent the best match to the chemical composition of the BSE."

    Section 3.2.1 states the geochemical inference that the Earth accreted ~70% reduced then ~30% oxidized material and says 'This constraint supplies some justification for the two-source model.' The reference model then fixes the initial reservoir mass split at exactly the same 2:1 ratio (1.4 vs 0.7 MEarth). With mostly local accretion, the resulting Earth budget (~70/30) is the input mass ratio returned as output, so the headline chemical 'explanation' is partly self-definitional rather than an independent prediction.

  2. other [Abstract vs Section 5 (Discussion), third paragraph]
    "This model explains: ... (3) the isotopic differences of the Earth and Mars. ... On the other hand, a 2:1 mass split between the inner and outer sources would produce a Mars that accretes ∼ 90% of material from the outer source and ∼ 10% of material from the inner ring (on average; Fig. 13B). This composition would not have enough EC material to explain observations."

    This is an internal contradiction rather than a construction-circularity, but it removes the Mars-isotope support from the central claim. The reference model's predicted Mars budget (~90% outer / ~10% inner) is the opposite of the ~65% EC / ~33% OC mix inferred in Section 3.2.3, and the authors explicitly admit the model 'would not have enough EC material to explain observations.' The abstract nevertheless lists 'the isotopic differences of the Earth and Mars' as one of the model's explanations.

full rationale

The N-body derivation itself is not circular: the success rates (V/E, Mars, Merc, V/E Sep = 50%, 35%, 32%, 33%; 6.1% all-good) are genuine stochastic outcomes of the integrations, and the disk profile of Eq. (9) is an assumed parameterization rather than a disguised result. Self-citations (e.g., Morbidelli et al. 2022 for the silicate-line ring, NM12 for the instability) are not used as uniqueness theorems and do not by themselves force the conclusions. The principal circularity is the Earth-composition claim: the 70/30 reduced/oxidized geochemical constraint (Section 3.2.1) is used to justify the two-source model, the reference model sets the inner/outer mass split to the same 2:1 ratio, and Section 5 then reports the ~70/30 Earth budget as the 'best match.' That is a fitted input presented as a finding. The Mars-isotope claim is, by the authors' own admission in Section 5, not satisfied by the reference model (90% outer-source material), which contradicts the abstract's third claimed explanation. The 6.1% figure is a tuned maximum over ~100 tested models, which is model selection rather than circularity but should be read as a benchmark, not a blind prediction. On balance: partial circularity in one headline explanation and an admitted failure in another, with an otherwise self-contained dynamical study.

Assumptions & free parameters 9 free parameters · 8 assumptions · 2 invented entities

The central claim rests on several tuned initial conditions (ring locations, widths, mass split, disk density) and on domain assumptions about planetesimal formation at the silicate sublimation line, the existence of an outer reservoir, and the MDW disk profile. The most significant circularity is the mass split w2=1/3, which is chosen partly to match the Earth's 70/30 composition that the paper then presents as a success. The dynamical success rates provide some independent grounding, but the model selection over ~100 parameter sets means the reported 6.1% success is an optimized value. The two invented reservoirs are inferred, not directly observed, and their origins are deferred.

free parameters (9)
  • Inner ring location r1 = 0.6 au (model203); best range 0.4-0.6 au
    Varied from 0.3 to 0.7 au across models; r1 controls Mercury's location and Venus/Earth formation. Tuned to maximize success rates.
  • Inner ring width sigma1 = 0.05 au (model203)
    Tested 0.025 to 0.2 au; narrow rings work best, consistent with silicate sublimation line origin.
  • Outer source location r2 = 1.7 au (model203)
    Varied 1.5 to 2.1 au; Mars success rate drops for r2=1.5 au. Tuned to produce good Mars.
  • Outer source width sigma2 = 0.1 au (model203)
    Tested 0.1 to 0.4 au; wider outer sources improve Mars success.
  • Mass split w2 = 1/3 (2:1 inner:outer)
    Tested 1:1 and 3:1 splits; the 2:1 split produces the desired ~70/30 Earth composition, coupling this parameter to the geochemical constraint.
  • Gas disk normalization Sigma0 = 3000 g/cm2
    Varied 1500 to 6000 g/cm2; controls migration strength and Venus/Earth separation. Tuned as a compromise between Mars and Venus/Earth criteria.
  • Disk profile parameters beta1, beta2 = beta1=-1, beta2=0
    Chosen to mimic MDW disks; not systematically varied, but the profile is load-bearing for outward migration.
  • Turbulence amplitude kappa = 3e-6
    Chosen to improve Mercury success; a single test without turbulence (model220) lowers Mercury success from 32% to 16%.
  • Total mass Mtot = 2.1 Earth masses
    Taken from Hansen (2009) and Woo et al. (2024); not fitted to success, but affects final planet masses.
assumptions (8)
  • standard math The Symba symplectic integrator accurately models encounters between massive bodies over 300 Myr.
    Used in all simulations; the paper cites Wisdom & Holman (1991) and Duncan et al. (1998) for its accuracy.
  • domain assumption Type-I migration torque formulas from Paardekooper et al. (2010, 2011) and Ogihara et al. (2014) apply to growing protoplanets in the modeled disks.
    The migration and damping forces use these prescriptions (Section 2.2.1); deviations from these torque models would change migration directions and rates.
  • ad hoc to paper The parameterized MDW disk profile (Eq. 9) approximates the surface density of real magnetically driven wind disks.
    The paper states this is a simple parameterization that 'roughly approximated the results of MHD simulations' (Section 2.2.2); it is not a self-consistent disk model.
  • domain assumption Planetesimals formed in a narrow ring near the silicate sublimation line at ~0.5 au.
    Motivated by Morbidelli et al. (2022) and Marschall & Morbidelli (2023); the paper notes Carrera et al. (2025) challenges this in turbulent disks.
  • domain assumption An outer planetesimal reservoir existed at 1.5 to 2 au.
    Inferred from the need to form Mars with a distinct isotopic composition; the paper defers the origin of this source to future work.
  • domain assumption The giant planet instability occurred at ~11 Myr following the NM12 Case 1 five-planet model.
    The instability model is taken from Nesvorny & Morbidelli (2012); other instability timings and configurations are not tested for the two-source model.
  • domain assumption Perfect mergers in most simulations approximate real collisions.
    The bulk of simulations assume perfect mergers; tests with fragmentation (Section 4.10) show some differences, especially for Mercury's mass.
  • ad hoc to paper The collisional fragmentation algorithm's mass removal approximates real mass loss.
    The paper acknowledges the algorithm exaggerates mass wasting by removing all fragments smaller than 1e-4 Earth masses (Section 2.5).
invented entities (2)
  • Inner ring planetesimal reservoir at ~0.5 au
    purpose: Source of Mercury, Venus, and Earth; supplies reduced, enstatite-chondrite-like material that is unsampled in meteorite collections.
    Postulated to explain the inner planet formation and Earth's reduced component. The paper predicts an implantation efficiency below 3e-7, meaning the reservoir is effectively absent from the asteroid belt, so no direct falsifiable handle exists outside the paper.
  • Outer planetesimal reservoir at 1.5 to 2 au
    purpose: Source of Mars and roughly 30% of Earth's late-accreted oxidized material.
    Inferred dynamically to produce a small Mars with a distinct isotopic composition; the origin of this reservoir is left to future work (Goldberg et al., in preparation), so it lacks independent evidence.

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Cite this review

Pith. "Pith review of Terrestrial Planet Formation from Two Source Reservoirs." pith.science (2026). https://pith.science/paper/PR3DDYUW

@misc{pith2026250714814,
  author       = {Pith},
  title        = {Pith review of: Terrestrial Planet Formation from Two Source Reservoirs},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/PR3DDYUW}},
  note         = {Machine review of arXiv:2507.14814}
}
read the original abstract

This work describes new dynamical simulations of terrestrial planet formation. The simulations started at the protoplanetary disk stage, when planetesimals formed and accreted into protoplanets, and continued past the late stage of giant impacts. We explored the effect of different parameters, such as the initial radial distribution of planetesimals and Type-I migration of protoplanets, on the final results. In each case, a thousand simulations were completed to characterize the stochastic nature of the accretion process. In the model best able to satisfy various constraints, Mercury, Venus, and Earth accreted from planetesimals that formed early near the silicate sublimation line near 0.5 au and migrated by disk torques. For Venus and Earth to end up at 0.7-1 au, Type-I migration had to be directed outward, for example as the magnetically driven winds reduced the surface gas density in the inner part of the disk. Mercury was left behind near the original ring location. We suggest that Mars and multiple Mars-sized protoplanets grew from a distinct outer source of planetesimals at 1.5-2 au. While many migrated inwards to accrete onto the proto-Earth, our Mars was the lone survivor. This model explains: (1) the masses and orbits of the terrestrial planets, (2) the chemical composition of the Earth, where ~70% and ~30% come from reduced inner-ring and more-oxidized outer-ring materials, and (3) the isotopic differences of the Earth and Mars. It suggests that the Moon-forming impactor Theia plausibly shared a similar isotopic composition and accretion history with that of the proto-Earth.

Figures

Figures reproduced from arXiv: 2507.14814 by the authors.

Figure 1
Figure 1. — The initial surface densities of gas disks considered in this work and elsewhere. [PITH_FULL_IMAGE:figures/full_fig_p073_1.png] view at source ↗
Figure 2
Figure 2. — A migration map for the MDW disk given by Eq. (9) with Σ [PITH_FULL_IMAGE:figures/full_fig_p074_2.png] view at source ↗
Figure 3
Figure 3. — The orbital histories of outer planets in our instability model. The planets started [PITH_FULL_IMAGE:figures/full_fig_p075_3.png] view at source ↗
Figures from the paper (14 more)
Figure 4
Figure 4. Figure 4: — A comparison between the scaling laws of Leinhardt & Stewart (2012) and the SPH [PITH_FULL_IMAGE:figures/full_fig_p076_4.png]
Figure 5
Figure 5. Figure 5: — The result of 100 successful simulations of the [PITH_FULL_IMAGE:figures/full_fig_p077_5.png]
Figure 6
Figure 6. Figure 6: — The result of 100 successful simulations of the [PITH_FULL_IMAGE:figures/full_fig_p078_6.png]
Figure 7
Figure 7. Figure 7: — The accretion history of planets in one of the best cases from the simulation set [PITH_FULL_IMAGE:figures/full_fig_p079_7.png]
Figure 8
Figure 8. Figure 8: — The Venus/Earth separation, ∆a, and the average eccentricities/inclinations, ⟨e, i⟩, for 111 successful simulations from 0.01au (the narrow ring at 0.85 au with a 20% back￾ground) that produced good terrestrial planets (as defined in Section 3.1). The triangles show …
Figure 9
Figure 9. Figure 9: — The planet growth and migration in the [PITH_FULL_IMAGE:figures/full_fig_p081_9.png]
Figure 10
Figure 10. Figure 10: — The result of 61 simulations from model203 (r1 = 0.6 au and r2 = 1.7 au, no background, strong convergent migration) that simultaneously produced a good match to Mercury, Venus, Earth and Mars (as defined in Section 3.1). The black dots show the final results in eac…
Figure 11
Figure 11. Figure 11: — The result of 61 simulations from model203 (r1 = 0.6 au and r2 = 1.7 au, no background, strong convergent migration) that simultaneously produced a good match to Mercury, Venus, Earth and Mars (as defined in Section 3.1). The black dots show the final results in eac…
Figure 12
Figure 12. Figure 12: — The Venus/Earth separation, ∆a, and the average eccentricities/inclinations, ⟨e, i⟩, for 61 simulations from model203 (r1 = 0.6 au and r2 = 1.7 au, no background, strong convergent migration) that produced good terrestrial planets (as defined in Section 3.1). The tr…
Figure 13
Figure 13. Figure 13: — The fraction of Earth and Mars mass accreted from beyond the orbital radius [PITH_FULL_IMAGE:figures/full_fig_p085_13.png]
Figure 14
Figure 14. Figure 14: — Earth’s growth in the successful simulations from [PITH_FULL_IMAGE:figures/full_fig_p086_14.png]
Figure 15
Figure 15. Figure 15: — The growth of planets in the successful simulations from [PITH_FULL_IMAGE:figures/full_fig_p087_15.png]
Figure 16
Figure 16. Figure 16: — Panel A. The last giant impact on the Earth in our reference model (model203). We collected all successful simulations and determined the last giant impact on the proto￾Earth (as defined in the main text). The triangles show the time of the last giant impact, tgiant…
Figure 17
Figure 17. Figure 17: — The radial distribution of terrestrial planetesimals in the successful two-source [PITH_FULL_IMAGE:figures/full_fig_p089_17.png]

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Reference graph

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Reviewed August 6, 2026 · model on record in the stance chip above.