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REVIEW 3 major objections 5 minor 45 references

Enabling high mass accretion rates onto massive main sequence stars by outer envelope mass removal

T0 review · 3 major / 5 minor · reviewed 2026-08-10 · deepseek-v4-flash

Pith's one-line read Main-sequence stars can net-accrete roughly 10% of their mass without expanding, if jets strip the outer envelope.

desk verdict Proof-of-concept for jet-regulated accretion: the ~10% mass gain is conditional on an imposed mass-removal scheme, not a demonstrated jet feedback loop. read the letter →

arxiv 2501.03947 v2 pith:YKN7NQWL submitted 2025-01-07 astro-ph.SR astro-ph.HE

classification astro-ph.SRastro-ph.HE
keywords massivemain-sequencestarsmassaccretionstellarjetsremovalexpansionintermediate-luminosityopticaltransientsEtaCarinaeMESAevolution
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 argues that massive main-sequence stars can keep their radius small while accreting mass at high rates, provided that jets launched by an accretion disk continuously remove the star's outer envelope. Using one-dimensional stellar-evolution simulations with alternating mass-addition and mass-removal phases, the authors show that stars of 30, 60, and 80 solar masses can each net-accrete about 10% of their initial mass before the process saturates, without permanently inflating. The result matters because jet-powered models of energetic transients such as luminous red novae and the Great Eruption of Eta Carinae require a companion star to swallow a few solar masses while staying deep enough in its gravitational potential to launch energetic jets.

What carries the argument

The mechanism is a two-part accretion pulse in the MESA stellar-evolution code: add mass at $1.5\times10^{-2}\,M_\odot\,\mathrm{yr}^{-1}$ together with a fraction $\eta_{\rm acc}$ of the accretion energy into the outer 10% by radius until the star expands to $R_{\rm add} = k_R R_0$, then remove mass at $1\times10^{-2}\,M_\odot\,\mathrm{yr}^{-1}$ until the star contracts back to $R_0$. The high-entropy, loosely bound outer layers created by energy deposition are exactly the layers removed, so the star keeps a deep potential well. A scaled density estimate for a Shakura-Sunyaev disk shows the disk is denser than the inflated envelope's outer layers, supporting the assumption that the disk survives and can launch jets there.

What would settle it

Run a three-dimensional hydrodynamical simulation of an accretion disk embedded in an inflated main-sequence envelope, with a jet duty cycle and power matching the 1D removal rate; if the jets cannot expel the outer ~10% of the radius before the envelope engulfs the disk, or if the disk is destroyed by the inflated envelope, the ~10% net accretion would not occur.

Watch

Extended reading notes

Core claim

The central claim is that imposing a radius cap—allowing the star to swell to only $k_R = 1.3$ times its initial radius between mass-addition episodes—lets a $30$–$80\,M_\odot$ main-sequence star asymptotically accumulate up to about 10% of its mass, because the high-entropy outer layers added during accretion are stripped away before they force runaway expansion. The accumulated mass grows with the allowed radius cap and with lower stellar mass, while the energy-injection efficiency $\eta_{\rm acc}$ has little effect. Without the removal phase, adding mass even without extra energy inflates the star, and constant-rate accretion without removal leads to unstable expansion, as earlier work found.

Load-bearing premise

The scenario assumes the jets actually strip the outer envelope at the rate and in the manner imposed by the 1D mass-removal prescription; this jet–envelope interaction is never simulated in three dimensions.

Editorial extensions

If this is right

  • A 30–80 solar-mass main-sequence star can asymptotically net-accrete about 10% of its initial mass without a final radius increase when its radius is capped at 1.3 R0.
  • Lower-mass stars and larger allowed radius caps yield larger fractional mass growth and higher net accretion rates.
  • The accretion disk's density exceeds the inflated envelope's outer-layer density by roughly an order of magnitude, so jets can plausibly be launched inside the envelope.
  • The scenario can supply the ~4 solar masses accreted by the proposed companion during Eta Carinae's Great Eruption, and power ILOTs and luminous red novae.
  • The ejected mass is several times the net accreted mass, so the ejecta's average terminal velocity is well below the stellar escape velocity.

Reading between the lines

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

  • If the mechanism works, the accreting star acts mainly as a mass processor: for every solar mass it keeps, it must eject several through jets (qej up to ~30 at early times for the 30-solar-mass model), so the inflowing envelope gas is recycled rather than accumulated.
  • The imposed radius cap resembles tidal truncation by an orbiting companion; real systems without such truncation may not achieve the same net accretion, so applying this scenario to isolated stars or wide binaries is not automatic.
  • Because the removal targets high-entropy regions, other removal agents such as line-driven winds or a common-envelope interaction might also prevent radius inflation; the jet is one concrete realization.
  • A direct observational test could search ILOT light curves and ejecta for the predicted low terminal velocities (well below escape velocity) and large ejected-to-accreted mass ratios.
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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 / 5 minor

Summary. This paper uses the one-dimensional stellar evolution code MESA to simulate rapid mass accretion onto 30, 60, and 80 M_sun main-sequence stars under a 'jetted-mass-removal accretion' scenario. In the model, mass is added at 1.5e-2 M_sun/yr with accretion energy deposited in the outer 10% by radius; when the stellar radius reaches k_R R_0 (k_R = 1.17 or 1.3), mass addition is stopped and mass is removed at 1e-2 M_sun/yr until the radius returns to R_0. The reported result is that the stars reach an asymptotic net mass increase of up to about 10% (Table 1) while the final radius returns to R_0. The paper also compares the density of an alpha-disk to the outer envelope density (Section 4) and estimates the removed-to-accreted mass ratio and ejecta velocity (Section 5), arguing that the scenario is relevant to ILOTs, grazing envelope evolution, and the Great Eruption of Eta Carinae.

Significance. If the assumed jet-driven removal of the outer envelope is physically realizable, the scenario would provide a mechanism for massive main-sequence stars to accrete substantial mass at high rates without runaway expansion, which is relevant to several classes of eruptive transients. The MESA models are internally consistent and the paper includes a useful parameter sweep over initial mass, k_R, and eta_acc, with quantitative results in Table 1 and Figures 1-5. The paper is transparent about its central assumption: the jets that remove the envelope are mimicked by imposed mass removal rather than modeled. The main value is as a proof-of-concept; the physical feasibility of the feedback loop remains to be demonstrated.

major comments (3)
  1. [Section 2, Eq. (1)] The radius bound is imposed by construction: mass addition stops when R reaches Radd = k_R R_0 and removal continues until R returns to R_0. Consequently, the statement in Section 3 that the star accretes mass 'without an increase in their final stellar radius' is not an emergent result of the physics; it is a boundary condition of the numerical scheme. The nontrivial output is the asymptotic accreted mass for this protocol, and the paper should state this explicitly and avoid presenting the radius constraint as a finding. It would strengthen the paper to vary the removal efficiency (e.g., Mdot_rem) and show how the net accreted mass degrades if removal is slower than assumed.
  2. [Sections 4-5] The physical mechanism for the imposed mass removal is not demonstrated. The density comparison in Section 4 (Eq. 2 vs. envelope density) establishes only a static necessary condition for a disk to exist inside the inflated envelope; it does not show that the disk can survive the inflow and jet-envelope interaction, nor that the jets can unbind the outer layers at the imposed Mdot_rem ~ 1e-2 M_sun/yr. The energy argument in Section 5 assumes that a fraction zeta ~ 1 of the accretion energy is converted into ejection of the removed mass, but no model or simulation of this coupling is presented. This is the load-bearing assumption of the paper, and it should be labeled as such throughout, with a concrete feasibility estimate or an explicit statement that the result is conditional on this assumption.
  3. [Section 2, energy deposition] The accretion energy is deposited uniformly per unit mass in the outer 0.1 by radius. This radial distribution is not derived from a physical model of where the accreted gas shocks or where the jet energy is thermalized, and it directly controls the expansion that triggers the mass-removal phase. The paper varies eta_acc but not the deposition zone or its profile; a test of the sensitivity to this choice (or a physical justification) is needed before the ~10% result can be considered robust.
minor comments (5)
  1. [Section 2] In the description of the mass-removal part, the rate is written as Mdot_add = -1e-2; this should be Mdot_rem to avoid confusion with the addition rate.
  2. [Figure 2 caption] The explanation that the thickness of each curve is not the line width but results from dense pulse spacing is confusing; consider plotting the envelope of the mass range or sampled pulse extrema.
  3. [Section 5, Eq. (5)] The derivation of Eq. (5) is too terse: please define q_ej and zeta in the same paragraph and state clearly that the removed mass is assumed to be ejected with no net energy contribution.
  4. [Table 1] Macc,f is called the asymptotic accreted mass, but no criterion for asymptotic convergence is given; please state the tolerance or the time at which the value is read.
  5. [Section 3] The phrase 'the outer parts have very high entropy' should refer to Figure 3 and specify that this refers to the newly accreted outer envelope.

Circularity Check

1 steps flagged · score 5.0 of 10

The 'no radius expansion' half of the headline is imposed by the pulse control rule, but the asymptotic ~10% net mass gain is a genuine MESA output; no load-bearing self-citation.

  1. self definitional [Section 2 (Method, eq. 1) and Section 3 (Results, main conclusion)]
    "When the star expands to a radius of Radd = kRR0, (1) we start the second part of the pulse of mass removal; ... Once the star contracts back to the initial radius R0, we stop mass removal and start mass and energy addition of the next pulse."

    The claimed headline result 'without an increase in their final stellar radius' is exactly the control rule: mass addition is stopped at Radd = kRR0 and removal is continued until R = R0. The radius is therefore forced to lie between R0 and kRR0 by construction, so the 'star does not expand much' part of the conclusion is an input, not an emergent prediction. The paper is transparent about this ('we keep the maximum and minimum stellar radii constant') and even calls it a 'demand' in Section 6, but the abstract and Section 3 nevertheless present it as a finding. The non-trivial ~10% asymptotic accreted mass is not directly imposed: it emerges from the MESA structural response, so the circularity is partial rather than total.

full rationale

The paper's central quantitative claim -- that a massive MS star can net-accrete ~10% of its mass when outer layers are removed to cap the radius -- does not reduce to a fitted parameter or to a self-citation. The asymptotic mass Macc,f is a MESA output determined by how much mass must be added to inflate from R0 to kRR0 and how much must be removed to contract back to R0; this depends on the entropy structure and is not equal to any input by construction. The main circular element is the radius statement: 'without an increase in their final stellar radius' is guaranteed by the stopping condition at R0, and the maximum radius kRR0 is an imposed threshold. The authors explicitly label the radius cap a 'demand' and state that the star radius stays at ~kRR0 by the assumed simultaneous inflow/outflow, so this is a modeling constraint rather than a hidden re-use of data. The jet-envelope removal mechanism is assumed, not demonstrated by hydrodynamics; that is an unvalidated assumption (correctness risk), not circularity. Self-citations to Bear & Soker 2025 are not load-bearing: the entropy argument is independently shown in Figure 3, and the no-removal expansion behaviour is grounded in the external study of Schürmann & Langer 2024. Score 5 reflects one prediction-by-construction in an otherwise independent derivation.

Assumptions & free parameters 5 free parameters · 3 assumptions · 0 invented entities

No new particles, forces, or conserved quantities are introduced. The 'jetted-mass-removal accretion' scenario is a mechanism, not a new entity. The free parameters and axioms listed are the main inputs the central result depends on.

free parameters (5)
  • k_R (maximum radius factor) = 1.17 and 1.3
    Chosen to keep the star compact for a deep potential well; directly controls the maximum expansion and, through the control flow, strongly influences the asymptotic accreted mass.
  • eta_acc (energy deposition efficiency) = 0.025, 0.1, 0.25
    Fraction of accretion gravitational energy deposited in outer envelope; varied and found to have little effect on results.
  • Mdot_add (mass addition rate) = 1.5e-2 Msun/yr
    Imposed by numerical capability of MESA in this scheme; net accretion rate is an output.
  • Mdot_rem (mass removal rate) = 1e-2 Msun/yr
    Fixed removal rate chosen to return the star to R0 in the removal phase.
  • Energy deposition zone (outer 0.1 by radius) = uniform power per unit mass
    Ad hoc spatial distribution of accretion energy; not derived from disk/jet physics.
assumptions (3)
  • ad hoc to paper Jets remove the outer envelope layers at the imposed rate and timing.
    The entire mechanism is assumed; the 1D model imposes removal when the radius exceeds R_add. No jet-envelope interaction is simulated.
  • domain assumption The Shakura-Sunyaev disk density formula (Frank et al. 2002, Eq. 5.49) applies to a disk embedded in an inflated envelope.
    Equation (2) is a scaled steady-state disk density, not designed for a disk surrounded by stellar envelope material. The authors note this uncertainty in Section 4.
  • domain assumption Accretion energy is deposited uniformly in the outer 10% by radius.
    This is a crude proxy for energy release at the stellar surface; the true deposition depends on the disk/star boundary layer and is not modeled.

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Cite this review

Pith. "Pith review of Enabling high mass accretion rates onto massive main sequence stars by outer envelope mass removal." pith.science (2026). https://pith.science/paper/YKN7NQWL

@misc{pith2026250103947,
  author       = {Pith},
  title        = {Pith review of: Enabling high mass accretion rates onto massive main sequence stars by outer envelope mass removal},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/YKN7NQWL}},
  note         = {Machine review of arXiv:2501.03947}
}
read the original abstract

Using the one-dimensional numerical code MESA, we simulate mass accretion at very high rates onto massive main sequence stars, M=30, 60, 80 Mo, and find that these stars can accrete up to 10% of their mass without expanding much if we consider a simultaneous mass removal by jets. In this jetted-mass-removal accretion scenario, the accretion is through an accretion disk that launches jets. When the star expands due to rapid mass accretion, it engulfs the inner zones of the accretion disk and the jets it launches. We assume that these jets remove the outer layers of the envelope. We mimic this in the one-dimensional numerical code by alternating mass addition and mass removal parts. We add mass and energy, the accretion energy, to the outer layers of the envelope, leading to rapid stellar expansion. When the star expands by a few tens of percent, we stop mass addition and start mass removal until the star returns to its initial radius. We also show that the density of the accretion disk is larger than the density of the outer layers of the inflated envelope, allowing the disk to launch jets inside the outer inflated envelope layers. Our results show that main sequence stars can accrete mass at high rates while maintaining the deep potential well, as some models of eruptive systems require, e.g., some luminous red novae, the grazing envelope evolution, and the 1837-1856 Great Eruption of Eta Carinae.

Figures

Figures reproduced from arXiv: 2501.03947 by the authors.

Figure 1
Figure 1. Stellar mass as a function of stellar age for the MZAMS = 80 M⊙ model. The graphs start when we start the accretion process. Red, blue, and black lines signify different energy deposition efficiencies of ηacc = 0.025, 0.1, 0.25, the fraction of the gravitational energy of the added mass. All cases are for Radd = 1.3R0 (kR = 1.3 in equation 1). For the scheme we use here, the energy deposition efficiency has little e… view at source ↗
Figure 3
Figure 3. Entropy profiles as a function of mass at three stages of the first accretion pulse of the MZAMS = 80M⊙ model with Radd = 1.3R0 and ηacc = 0.1. The black, red, and blue lines represent the entropy profiles of the model at tacc = 0 (just before accretion starts), end of mass addition phase of the first pulse, and the end of the mass removal phase of the first pulse, respectively. Entropy is given by mesa as the speci… view at source ↗
Figure 2
Figure 2. Stellar mass as a function of time, measured from the beginning of the accretion process, for three stellar mod￾els with MZAMS = 80M⊙,MZAMS = 60M⊙, and MZAMS = 30M⊙, and for two values of the stellar radius where we change from mass addition to mass removal, Radd = 1.17R0 and Radd = 1.3R0. The age of the stellar models on the main sequence when pulses of mass addition and removal start are tMS(80M⊙) = 2.85 × 105 , t… view at source ↗
Figures from the paper (1 more)
Figure 5
Figure 5. Figure 5: The ratio of the removed mass to the net accreted mass (equation 4) as a function of accreted mass for the six simulations we present in [PITH_FULL_IMAGE:figures/full_fig_p006_5.png]

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Reviewed August 10, 2026 · model on record in the stance chip above.