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arxiv: 2607.01699 · v1 · pith:JIAC7KLEnew · submitted 2026-07-02 · 🌌 astro-ph.SR · astro-ph.EP

The Sun's chemical peculiarity: disentangling Galactic chemical evolution and planetary engulfment in solar twins

Mia Babatsikos , Fan Liu , Amanda Karakas , Ilya Mandel , Lachlan Passenger , Megan Bedell , Sharon Wang , Zimo Cheng This is my paper

Pith reviewed 2026-07-03 05:26 UTC · model grok-4.3

classification 🌌 astro-ph.SR astro-ph.EP
keywords solar twinsGalactic chemical evolutionplanetary engulfmentstellar abundanceschemical peculiarityBayesian analysisSun compositiondifferential spectroscopy
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The pith

Galactic chemical evolution accounts for most of the Sun's chemical differences from other solar twins

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

The paper tests whether the Sun appears chemically unusual compared to similar stars because it engulfed planets or because of how the Milky Way's composition changed over time. It remeasures abundances in 79 nearby solar twins with high precision and applies a Bayesian method to separate the two effects from random scatter. The analysis finds that GCE trends describe the patterns in about 62 percent of the sample, leaving only a small number of stars whose compositions suggest possible planet ingestion. This matters because it reframes the Sun as typical once galactic history is included, rather than an outlier that requires special planet-related explanations.

Core claim

The chemical peculiarity of the Sun relative to the average solar twin is largely driven by GCE effects, with 62.3±5.8% of our sample exhibiting abundance patterns well-described by GCE trends. We further identify 2--6 solar twin candidates exhibiting chemical signatures consistent with planetary engulfment that warrant further investigation. These findings reinforce the importance of accounting for GCE effects when interpreting solar twin abundance patterns, and suggest that the Sun may not be chemically peculiar relative to the majority of solar twins.

What carries the argument

An independent Bayesian indicator that separates Galactic chemical evolution trends and planetary engulfment signatures from intrinsic abundance scatter in differential abundance measurements of 18 elements

If this is right

  • GCE effects must be included before attributing abundance anomalies in solar twins to planet interactions.
  • The Sun's composition aligns with the majority of solar twins once GCE is accounted for.
  • Two to six stars in the sample show abundance patterns consistent with planetary engulfment and merit targeted follow-up.
  • Differential abundance analysis combined with the Bayesian separation provides a practical way to classify solar-twin chemistry.

Where Pith is reading between the lines

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

  • Similar Bayesian separation could be applied to abundance data for stars outside the solar-twin range to test how common engulfment signatures are across stellar types.
  • If confirmed, the small number of engulfment candidates would imply that planet ingestion is uncommon among stars with solar-like masses and metallicities.
  • Long-term monitoring of the candidate stars for debris disks or unusual planetary architectures could provide an independent check on the engulfment interpretation.

Load-bearing premise

An independent Bayesian indicator can reliably separate Galactic chemical evolution and planetary engulfment signals from other processes that affect stellar composition.

What would settle it

High-precision spectra of additional solar twins that, after the same Bayesian separation, show a substantially lower fraction following GCE trends or a higher fraction matching only the engulfment pattern would contradict the reported dominance of GCE.

Figures

Figures reproduced from arXiv: 2607.01699 by Amanda Karakas, Fan Liu, Ilya Mandel, Lachlan Passenger, Megan Bedell, Mia Babatsikos, Sharon Wang, Zimo Cheng.

Figure 1
Figure 1. Figure 1: Distribution of differences in stellar parameters between this work and L. Spina et al. (2018) for the same sample of 79 solar twins, comparing effective temperature (top left), surface gravity (top right), microturbulence (bot￾tom left) and metallicity (bottom right). The x-axis shows ∆m = mthis work − mSpina for each star. Dashed and dot￾ted lines indicate the mean µ and standard deviation σdiff of each … view at source ↗
Figure 2
Figure 2. Figure 2: Mean differences in differential elemental abun￾dances [X/H] between this work and M. Bedell et al. (2018), averaged over the stellar sample of 79 solar twins, as a func￾tion of atomic number. Error bars represent the standard de￾viation of the abundance differences across the stellar sample (σdiff ). The average abundance difference between the two studies is -0.004 dex. 3.2. Bayesian Results We obtain Ba… view at source ↗
Figure 4
Figure 4. Figure 4: Distributions of the difference in Bayesian ev￾idence ∆ lnZ between the GCE model and the null-offset (left) and flat models (right) fitted to the observed [X/Fe] GCE-uncorrected data for the sample of 69 solar twins in the solid colour. The dashed grey lines represents the equiv￾alent distributions for model fits to corresponding mock noise samples. (i) ∆ lnZ(GCE−null) > 2; (ii) ∆ lnZ(GCE−flat) > 4. The p… view at source ↗
Figure 5
Figure 5. Figure 5: Distributions of the difference in Bayesian evi￾dence ∆ln(Z) between the planetary engulfment models and the null-offset and flat models fitted to the observed [X/Fe] GCE-corrected (B18) data for the sample of 69 solar twins in the solid colour. The dashed grey lines represents the equiva￾lent distributions for model fits to corresponding mock noise samples. dates for further follow-up. For both the CM cho… view at source ↗
Figure 6
Figure 6. Figure 6: Bayesian fitting results for the GCE-corrected (B18) elemental abundances [X/Fe] of the best engulfment candidate HIP 101905, comparing the baseline null-offset and flat models to the Bulk Earth engulfment model (top) and CM chondritic engulfment model (bottom). The observed abundance data are shown in orange, while the best-fitting abundance patterns for the flat model, null-offset, and en￾gulfment models… view at source ↗
Figure 7
Figure 7. Figure 7: [Si/Fe] GCE-corrected (B18) abundances of rep￾resentative species silicon as a function of magnetic activity index logR′ HK (top) and stellar age (bottom). We observe no strong correlations between these variables, with similar results found for other elemental abundances. is expected, as enhanced magnetic activity leads to in￾creased line broadening and consequently greater scat￾ter in line-by-line differ… view at source ↗
Figure 9
Figure 9. Figure 9: Comparison of the observed elemental abundances [X/Fe] (solid pink) with mock noise samples generated from the null-offset (dashed black line) and flat (dotted blue line) models. The comparison is shown for the GCE-uncorrected sample (left), and the two GCE-corrected samples using the M. Bedell et al. (2018) trends (middle) and our own age-abundance trends (right). Each distribution includes all measured s… view at source ↗
Figure 10
Figure 10. Figure 10: Elemental [X/Fe] abundances derived in this work as a function of stellar age. The solid orange lines show the best-fit linear age–abundance relations derived in this work, and the dotted grey lines show the corresponding relations from M. Bedell et al. (2018) for comparison. noise datasets. The resulting ∆ lnZ distributions are shown in [PITH_FULL_IMAGE:figures/full_fig_p017_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: The same description as [PITH_FULL_IMAGE:figures/full_fig_p019_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: The same description as [PITH_FULL_IMAGE:figures/full_fig_p020_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Bayesian abundance-pattern fits for the engulfment candidates HIP 30502 (above; age 7.0±0.4 Gyr), HIP 77052 (middle; age 4.5±0.7 Gyr), and HIP 85042 (bottom; age 7.8±0.3 Gyr) (L. Spina et al. 2018). For each star, the bulk Earth model is shown on the left and the CM chondritic model on the right and colours and line styles are as in [PITH_FULL_IMAGE:figures/full_fig_p021_13.png] view at source ↗
read the original abstract

Recent observational studies have suggested that the Sun may be chemically peculiar relative to the majority of solar twins. Here, we re-analyse high-resolution, high signal-to-noise spectra of 79 nearby solar twins using a differential spectroscopic approach and Bayesian framework to test whether the Sun's chemical peculiarity arises from Galactic chemical evolution (GCE) or planetary ingestion. Using the spectroscopic tool \texttt{Korg}, we obtain highly precise, validated atmospheric parameters and abundances for 18 elements, with an average abundance precision of 0.015\,dex (3.5\%). Employing an independent Bayesian indicator, we disentangle GCE and planetary engulfment signatures from other processes influencing stellar composition, including intrinsic abundance scatter. Our results indicate that the chemical peculiarity of the Sun relative to the average solar twin is largely driven by GCE effects, with 62.3$\pm$5.8\% of our sample exhibiting abundance patterns well-described by GCE trends. We further identify 2--6 solar twin candidates exhibiting chemical signatures consistent with planetary engulfment that warrant further investigation. These findings reinforce the importance of accounting for GCE effects when interpreting solar twin abundance patterns, and suggest that the Sun may not be chemically peculiar relative to the majority of solar twins.

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

1 major / 2 minor

Summary. The manuscript re-analyzes high-resolution spectra of 79 nearby solar twins with the Korg code to derive precise atmospheric parameters and abundances (average precision 0.015 dex) for 18 elements. It applies a Bayesian framework with an 'independent Bayesian indicator' to separate Galactic chemical evolution (GCE) trends from planetary engulfment signatures and intrinsic scatter, concluding that the Sun's chemical peculiarity is largely explained by GCE (62.3±5.8% of the sample follows GCE trends) while flagging 2–6 twins as potential engulfment candidates.

Significance. If the Bayesian separation is shown to be robust and non-circular, the result would clarify that most solar twins are consistent with GCE expectations, reducing the inferred role of planetary engulfment in explaining the Sun's abundance pattern and reinforcing the need to model GCE when comparing solar twins. The differential analysis and reported precision represent a methodological strength.

major comments (1)
  1. [Abstract] Abstract (Bayesian framework paragraph): the central claim that 62.3±5.8% of the sample follows GCE trends and that 2–6 twins show engulfment signatures rests on an 'independent Bayesian indicator' that disentangles GCE, engulfment, and intrinsic scatter. No derivation of the indicator, construction of priors, likelihood function, or explicit cross-validation against known sources of scatter (NLTE corrections, 3D granulation, or measurement covariance) is described, leaving open the possibility that the indicator correlates with the same abundance patterns used to define GCE trends.
minor comments (2)
  1. [Abstract] Abstract: the reported abundance precision of 0.015 dex (3.5%) should specify whether this is the mean, median, or rms across elements and whether it includes systematic contributions.
  2. [Abstract] Abstract: the range '2--6' candidates is given without stating the exact selection threshold or posterior probability cut used to identify them.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading and constructive comments on our manuscript. We address the single major comment below.

read point-by-point responses

  1. Referee: [Abstract] Abstract (Bayesian framework paragraph): the central claim that 62.3±5.8% of the sample follows GCE trends and that 2–6 twins show engulfment signatures rests on an 'independent Bayesian indicator' that disentangles GCE, engulfment, and intrinsic scatter. No derivation of the indicator, construction of priors, likelihood function, or explicit cross-validation against known sources of scatter (NLTE corrections, 3D granulation, or measurement covariance) is described, leaving open the possibility that the indicator correlates with the same abundance patterns used to define GCE trends.

    Authors: We agree that the manuscript does not currently provide a full derivation of the independent Bayesian indicator, including explicit priors, likelihood construction, or cross-validation against NLTE, 3D, and covariance effects. The abstract paragraph is a high-level summary only. We will revise the Methods section to include these details and add a dedicated robustness subsection demonstrating that the indicator is constructed to be orthogonal to the GCE trends (via separate element subsets and hierarchical modeling). This addresses the potential correlation concern directly. revision: yes

Circularity Check

0 steps flagged

No circularity: Bayesian indicator applied to data yields output fraction without reduction to inputs

full rationale

The paper's central result (62.3±5.8% of sample follows GCE trends) is obtained by applying an explicitly labeled 'independent Bayesian indicator' to high-resolution spectra of 79 solar twins. The abstract presents this indicator as disentangling GCE/engulfment from intrinsic scatter without any quoted equations or steps that define the indicator in terms of the target fraction or fit parameters directly to the claimed percentage. No self-citations are invoked as load-bearing for the indicator's construction, and the reported candidate count (2-6) is likewise a model output on observational data rather than a renaming or self-definitional step. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard assumptions in stellar spectroscopy and the ability of Bayesian methods to separate astrophysical processes; no free parameters or invented entities are introduced in the abstract.

axioms (2)
  • domain assumption Differential spectroscopic analysis with Korg yields accurate relative abundances at 0.015 dex precision
    Basis for all reported measurements and the 62.3% statistic
  • domain assumption Bayesian indicator can separate GCE, planetary engulfment, and intrinsic scatter
    Explicitly invoked to disentangle signatures in the abstract

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