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arxiv: 2606.10624 · v1 · pith:KAGBBTX7new · submitted 2026-06-09 · 🌌 astro-ph.EP

Multi-epoch scattered-light analysis of HD 135344B: new evidence for a spiral-driving protoplanet

J. Latour , V. Christiaens , O. Absil , M. Bonse , R. Savonet , S. Juillard , I. Hammond , S. Casassus
show 12 more authors
L. Cieza G. Cugno C. Desgrange S. Lacour D. Mawet M. Montesinos S. Perez C. Pinte M. Reggiani T. Stolker N. van der Marel A. Zurlo
This is my paper

Pith reviewed 2026-06-27 12:01 UTC · model grok-4.3

classification 🌌 astro-ph.EP
keywords protoplanetary diskscattered lightspiral armsprotoplanetHD 135344Borbital motiondust filament
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The pith

The scattered-light twist in the HD 135344B disk moves at the orbital speed expected for a planet at 69 au.

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

The paper tracks the position of spiral features and an embedded twist in the HD 135344B disk across ten years of scattered-light observations from multiple telescopes and instruments. The measured angular motion of 0.81 degrees per year matches the expected Keplerian speed at 69 au and remains consistent across wavelengths. This co-motion with the spiral supports the idea that a single embedded protoplanet can explain the spirals, the gap, the dust filament seen in sub-mm data, and the twist. The analysis also shows that a previously reported protoplanet candidate is an artifact of the data processing rather than a real detection. A remaining unexplained trend is that the spiral traces appear at larger separations from the star at longer wavelengths.

Core claim

Tracking the spiral traces and the twist they contain across VLT/NACO, SPHERE, ERIS, and JWST/NIRCam datasets shows an average orbital motion of 0.81 ± 0.05 deg/yr that is consistent with a body at 69 ± 4 au. Simple modeling confirms the twist moves together with the spiral in which it sits, and its position angle aligns with the ALMA dust filament, while its smaller separation at shorter wavelengths is attributed to the spiral itself moving outward with wavelength.

What carries the argument

Multi-epoch measurement of the position angle and radial location of the scattered-light twist after applying post-processing to reduce biases on extended emission.

If this is right

  • The spirals, gap, dust filament, and twist share a common origin in one protoplanet embedded within the spiral at about 69 au.
  • A recently claimed protoplanet candidate is a post-processing artifact and does not correspond to a real body.
  • The twist remains co-moving with the spiral over the full ten-year baseline at all observed wavelengths.
  • The angular separation of the spiral trace from the star increases with wavelength, producing the observed shift in the twist location.

Where Pith is reading between the lines

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

  • If the single-protoplanet picture holds, similar twists in other disks could serve as indirect tracers of embedded planets when direct detection remains difficult.
  • The unexplained wavelength dependence of spiral radius may require models that include the vertical structure or temperature gradient of the disk surface.
  • Repeated imaging campaigns on other spiral-hosting disks could test whether the same orbital-motion signature appears at comparable separations.

Load-bearing premise

The smaller angular separation of the twist at shorter wavelengths occurs because the spiral trace itself moves outward with increasing wavelength rather than marking a separate physical structure or projection effect.

What would settle it

A new observation epoch in which the twist has not advanced by roughly 0.81 degrees per year from its prior positions would show that the motion is not orbital at 69 au.

Figures

Figures reproduced from arXiv: 2606.10624 by A. Zurlo, C. Desgrange, C. Pinte, D. Mawet, G. Cugno, I. Hammond, J. Latour, L. Cieza, M. Bonse, M. Montesinos, M. Reggiani, N. Van der Marel, O. Absil, R. Savonet, S. Casassus, S. Juillard, S. Lacour, S. Perez, T. Stolker, V. Christiaens.

Figure 1
Figure 1. Figure 1: Image gallery of the HD 135344B protoplanetary disk at different wavelengths for multiple datasets. The central star is masked and marked by a white star marker. All of the images were processed using IPCA, except for the images in the YJH bands. North is up, East is left. The yellow circles indicate the spatial resolution of each image. protoplanetary disk in that filter; hence why no image is shown using… view at source ↗
Figure 2
Figure 2. Figure 2: View of the protoplanetary disk of HD 135344B at different wavelengths, post-processing the 2015 coronagraphic SPHERE dataset with PCA-data imputation, which is the dataset that provides the best-quality images of the disk. The different spiral arms are labeled, along with a noticeably brighter region of S1 named the S1 blob. The images were r 2 -scaled and deprojected, and the center of the images is mark… view at source ↗
Figure 3
Figure 3. Figure 3: Spiral traces in polar coordinates in the K1 filter in the de￾projected images. Theta is the angle measured counterclockwise from North of the central star. In black, labeled ∆r, the typical trace uncer￾tainty, not shown on each data point to improve readability. the distance to the closest local minimum in the flux profile. The resulting (r,θ) pairs for the K1 filter are shown in the middle panel of [PIT… view at source ↗
Figure 4
Figure 4. Figure 4: Spirals traces in polar coordinates for the same observation (SPHERE 2015) at different wavelengths. Theta is the angle measured counterclockwise from North of the central star. Contrary to [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Zoomed in view of the spirals trace for the 2015 SPHERE observation. A single and two-spiral fit are compared. The vertical line shows the breakpoint (the twist) found by the model between the two spirals for the two-spiral fit, along with its uncertainties in the shaded area. to the trace of the spiral, with a and b real numbers. Then, we al￾low for a more complex double-spiral model, in which a break￾poi… view at source ↗
Figure 7
Figure 7. Figure 7: ERIS images processed with PCA (left) and IPCA (right). The center of the images is masked and marked by the white star marker. The candidate found in Maio et al. (2025), detected as they did in the left image with PCA, is marked by the red cross on both images. 4.2. Spectral signature [PITH_FULL_IMAGE:figures/full_fig_p008_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: NACO images produced with IPCA (left) from which the disk was extracted to inject in a NACO reference datacube. PCA-processed image of the fake datacube (right). The location of the candidate found by Maio et al. (2025) is marked by the red cross, while the black cross marks point-like artifacts generated by the ADI post-processing, which also exhibit what could be interpreted as negative side lobes. The w… view at source ↗
read the original abstract

The HD 135344B (SAO 206462) disk exhibits strong signposts of planet formation. ALMA images in the sub-mm revealed a gap-crossing dust filament whose position coincides with a twist detected in the scattered-light spiral structure. Analysis of the spirals in polarized light also hints at a spiral-driving protoplanet in the sub-mm gap. We aim to study the spirals dynamics, as well as the twist, over a 10-year baseline, in different bands. We also seek to assess the authenticity of a recently claimed candidate protoplanet. We use high-fidelity post-processing algorithms such as IPCA to minimize the biases induced by ADI on extended sources and analyze archival VLT/NACO, VLT/SPHERE, VLT/ERIS and JWST/NIRCam datasets to obtain the spiral traces and measure their orbital motion in multiple scattered light bands. We measure an average spiral orbital motion of 0.81$\pm$0.05 deg/yr, in agreement with the literature value of about 0.85$\pm$0.05 deg/yr at all wavelengths. With simple modeling of the twist morphology, we confirm that it is co-moving with the spiral in which it is embedded. While the position angle of the twist coincides with the dust filament, it is located at a smaller angular separation from the star, which we attribute to the fact that the spiral trace moves away from the central star with increasing wavelength. We find that a recently claimed protoplanet candidate can be explained as a post-processing artifact. Our confirmation that the motion of the scattered light twist is consistent with the orbital velocity of a planet at 69$\pm$4 au over a 10-year baseline suggests that the spirals, the gap, the dust filament, and the twist, could indeed be attributed to the same hypothetical protoplanet embedded within the spiral. A perplexing trend for a wavelength-dependence of the angular distance of the spiral traces to the central star remains to be explained.

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 paper analyzes multi-epoch scattered-light data (VLT/NACO, SPHERE, ERIS, JWST/NIRCam) of the HD 135344B disk over a ~10-year baseline. It reports an average spiral orbital motion of 0.81±0.05 deg/yr consistent with prior measurements, uses simple modeling to confirm that the twist feature co-moves with the embedded spiral, dismisses a recently claimed protoplanet candidate as a post-processing artifact, and concludes that the spirals, gap, dust filament, and twist are consistent with a single hypothetical protoplanet at 69±4 au. The abstract notes a perplexing wavelength-dependent trend in the angular separation of the spiral traces.

Significance. If the attribution to a single protoplanet holds, the work supplies dynamical evidence connecting multiple disk signposts over a decade-long baseline and across wavelengths, bolstering interpretations of planet-driven spirals in transition disks. Strengths include the use of IPCA to reduce ADI biases on extended emission, the direct measurement of consistent angular motion (0.81±0.05 deg/yr) matching literature, and the explicit dismissal of an artifact candidate. The low circularity of the 69 au radius (derived from observed angular speed via standard Keplerian conversion) is a positive feature.

major comments (1)
  1. [Abstract] Abstract (final paragraph) and discussion of twist morphology: The central claim that the spirals, gap, dust filament, and twist can be attributed to the same protoplanet at 69±4 au rests on positional coincidence. This requires interpreting the smaller angular separation of the twist at shorter wavelengths as the spiral trace moving outward with increasing wavelength. No quantitative model of scattering-surface height, pitch-angle variation, or projection effects is supplied to justify the shift, and the text itself labels the trend 'perplexing' and 'remain[ing] to be explained.' If the wavelength dependence instead indicates a distinct structure, the unification argument is weakened.
minor comments (2)
  1. [Methods/Results] The modeling of the twist is described as 'simple'; adding a brief sensitivity test to assumed spiral geometry or inclination would strengthen the co-motion result without altering the main analysis.
  2. Notation for angular separations and position angles should be defined consistently in a single table or section to aid comparison across bands and epochs.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading and constructive feedback on our manuscript. We respond to the single major comment below.

read point-by-point responses

  1. Referee: [Abstract] Abstract (final paragraph) and discussion of twist morphology: The central claim that the spirals, gap, dust filament, and twist can be attributed to the same protoplanet at 69±4 au rests on positional coincidence. This requires interpreting the smaller angular separation of the twist at shorter wavelengths as the spiral trace moving outward with increasing wavelength. No quantitative model of scattering-surface height, pitch-angle variation, or projection effects is supplied to justify the shift, and the text itself labels the trend 'perplexing' and 'remain[ing] to be explained.' If the wavelength dependence instead indicates a distinct structure, the unification argument is weakened.

    Authors: We acknowledge that the manuscript provides no quantitative model of scattering-surface height, pitch-angle variation, or projection effects to explain the wavelength-dependent radial shift, which we explicitly describe as 'perplexing' and remaining to be explained. However, the central unification argument is not based solely on positional coincidence. It rests primarily on the dynamical evidence: the measured angular motion of 0.81±0.05 deg/yr is identical across all wavelengths and consistent with Keplerian motion at 69±4 au, while our simple modeling confirms the twist co-moves with the spiral over the 10-year baseline. The wavelength-independent angular speed supports the features being physically connected even if their apparent radial locations vary. We will revise the abstract and discussion to better distinguish the dynamical constraints from the morphological interpretation and to explicitly note the absence of a quantitative scattering model as a limitation requiring future work. revision: partial

Circularity Check

0 steps flagged

No significant circularity: purely observational measurement converted via standard Keplerian law

full rationale

The paper measures angular orbital motion (0.81±0.05 deg/yr) directly from multi-epoch imaging across bands and converts it to a semi-major axis of 69±4 au using the standard Keplerian relation between angular speed and orbital radius. This conversion relies on external constants (stellar mass, distance) and contains no internal fitting, self-citation chain, or redefinition of inputs as outputs. The wavelength-dependent radial shift is explicitly flagged as a 'perplexing trend' that 'remains to be explained' with no quantitative model supplied, so the unification claim rests on positional coincidence and motion consistency rather than any self-referential derivation. No load-bearing step reduces to a fitted parameter or prior self-citation.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 1 invented entities

The central claim rests on standard disk-dynamics assumptions plus one explanatory entity introduced without direct detection.

free parameters (1)
  • planet orbital radius = 69 au
    69±4 au derived from measured 0.81 deg/yr angular motion under Keplerian assumption
axioms (2)
  • domain assumption Observed angular motion of spirals and twist corresponds to Keplerian orbital motion of a planet at fixed radius
    Invoked to convert measured rate to 69 au separation
  • domain assumption Wavelength-dependent change in apparent spiral separation is a projection or scattering effect rather than a distinct physical feature
    Used to reconcile twist position with dust filament
invented entities (1)
  • hypothetical protoplanet no independent evidence
    purpose: Single body invoked to explain spirals, gap, filament and twist together
    No direct imaging or independent mass/detection provided

pith-pipeline@v0.9.1-grok · 6007 in / 1463 out tokens · 33412 ms · 2026-06-27T12:01:02.086559+00:00 · methodology

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Reference graph

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