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arxiv: 2602.18553 · v2 · pith:DEFMDYFXnew · submitted 2026-02-20 · 🌌 astro-ph.EP

POSEIDON I: The Dynamical Origins of Transiting Neptunes

Pith reviewed 2026-05-25 07:21 UTC · model grok-4.3

classification 🌌 astro-ph.EP
keywords exoplanetsstellar obliquityRossiter-McLaughlinNeptuneplanetary migrationspin-orbit alignmentTOI-181TOI-883
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The pith

Transiting Neptunes show a mix of aligned and random stellar spin-orbit angles, matching the pattern for Jupiters.

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

The paper measures sky-projected obliquities for two new transiting Neptunes using Rossiter-McLaughlin spectroscopy. One system is misaligned and the other eccentric, both consistent with high-eccentricity migration. When added to the existing sample the distribution of angles fits a model with mostly aligned orbits plus a smaller random component. This shape closely resembles the obliquity distribution of transiting Jupiters, implying the two populations experienced similar dynamical histories.

Core claim

The current sample of transiting Neptunes is consistent with a population of well-aligned systems and a smaller population with nearly random obliquities; this distribution resembles that observed for more massive planets, suggesting that transiting Jupiters and Neptunes originate from similar dynamical processes.

What carries the argument

Addition of two new Rossiter-McLaughlin measurements of sky-projected spin-orbit angle λ to the existing sample, followed by statistical comparison of the combined obliquity distribution against aligned-plus-random and bimodal models.

If this is right

  • High-eccentricity migration is a viable channel for at least some transiting Neptunes.
  • The dynamical processes that set spin-orbit angles do not depend strongly on planet mass in the Neptune-to-Jupiter range.
  • The relative fraction of aligned versus random systems can be refined with additional measurements.

Where Pith is reading between the lines

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

  • If the similarity persists, models of scattering or disk migration must produce comparable outcomes across a wide mass range.
  • Future data could distinguish whether the random component is fully isotropic or carries a weak preferred direction.
  • Transit detection biases may still affect how well the current sample represents the full population.

Load-bearing premise

The combined measurements give an unbiased view of the true obliquity distribution for transiting Neptunes.

What would settle it

A significantly larger sample whose obliquity histogram deviates strongly from an aligned-plus-random mixture would falsify the consistency claim.

Figures

Figures reproduced from arXiv: 2602.18553 by Andr\'es Jord\'an, Cristobal Petrovich, Elise Koo, Felipe I. Rojas, Gavin Boyle, Gu{\dh}mundur Stef\'ansson, Hareesh Bhaskar, Hugo Veldhuis, Jeffrey D. Crane, Johanna K. Teske, Joshua N. Winn, Juan I. Espinoza-Retamal, Marcelo Tala Pinto, Melissa J. Hobson, Rafael Brahm, Rodrigo Leiva, R. Paul Butler, Shreyas Vissapragada, Stephen Shectman, Vincent Suc.

Figure 1
Figure 1. Figure 1: Orbital period versus planet radius for transit￾ing planets. Gray points are from the TEPCat catalog (J. Southworth 2011) as of November 2025. Colored points are those for which the stellar obliquity has been measured, with five-pointed stars highlighting TOI-181 b and TOI-883 b. Dashed blue lines indicate the boundaries of the Neptune desert, ridge, and savanna as defined by A. Castro-González et al. (202… view at source ↗
Figure 2
Figure 2. Figure 2: Radial-velocity and photometric observations of TOI-181. In all cases, the red curves are best-fit models and the residuals are plotted beneath the data. The error bars include a white noise jitter term added in quadrature. a) PFS velocities spanning a transit and exhibiting the RM effect. b) HARPS velocities across all orbital phases. c) MOANA photometry of the same transit observed with PFS. d) Phase-fol… view at source ↗
Figure 3
Figure 3. Figure 3: Radial-velocity and photometric observations of TOI-883. In all cases, the red curves are best-fit models and the residuals are plotted beneath the data. The RV error bars include a white noise jitter term added in quadrature. a) NEID velocities spanning a transit and exhibiting the RM effect. b) HARPS and PFS velocities across all orbital phases. c) Phase-folded photometry based on TESS observations with … view at source ↗
Figure 4
Figure 4. Figure 4: Mass versus radius diagram. Grey points are all the transiting exoplanets from TEPCat (J. Southworth 2011) as of November 2025. Colored points convey the projected obliquity for systems with published measurements. Trian￾gles indicate systems with only upper limits available for the mass. TOI-181 b and TOI-883 b are highlighted as stars fol￾lowing the same color code. The green dashed lines indicate the re… view at source ↗
Figure 5
Figure 5. Figure 5: Stellar obliquity of Neptune (2 ≤ Rp/R⊕ ≤ 6 or 10 ≤ Mp/M⊕ ≤ 50) hosts as a function of the stellar effective temperature. Upper panels show the projected obliquity while lower panels the true obliquity. Left panels show systems where no companion star has been reported and right panels show known multiple-star systems. Neptunes that have planetary companions with periods between 1/5th and 5 times the perio… view at source ↗
Figure 6
Figure 6. Figure 6: Inferred stellar obliquity distributions for the samples of Jupiter and Neptune hosts. This inference was based on sky-projected obliquity measurements, following the methodology of J. Dong & D. Foreman-Mackey (2023), without including information about the stellar inclination. The solid line shows the median distribution, and random samples from the posteriors are shown in the background. a) Distribution … view at source ↗
Figure 7
Figure 7. Figure 7: Inferred stellar obliquity distributions for the different subsamples of Neptune hosts. In all panels the median distribution is shown as the solid line, and random samples from the posteriors are shown in the background. a) Neptunes that are apparently isolated, i.e., that have no known close planetary companions (orange). b) Neptunes with known close companions (blue). c) Neptune hosts that are single st… view at source ↗
read the original abstract

We present the first results from the POSEIDON survey, aimed at constraining the dynamical origins of transiting Neptunes through stellar obliquity measurements. We report Rossiter-McLaughlin observations of two Neptunes, TOI-181 b and TOI-883 b, obtained with high-resolution spectroscopy from Magellan/PFS and WIYN/NEID. TOI-181 b is on a 4.5-day orbit with a sky-projected spin-orbit misalignment $\lambda = 32.0_{-6.5}^{+6.3}\,^{\circ}$ and a low eccentricity ($e<0.12$ with $2\sigma$ confidence). TOI-883 b has a longer orbital period of 10 days with $\lambda = 22_{-14}^{+15}\,^{\circ}$ and eccentricity $e = 0.16 \pm 0.03$. The significant misalignment of TOI-181 b and the significant eccentricity of TOI-883 b are suggestive of high-eccentricity migration for both systems. After adding these and other new measurements to the sample, we analyze the obliquity distribution of the host stars of transiting Neptunes. Earlier studies had suggested that the obliquity distribution is bimodal, with peaks corresponding to aligned orbits and polar orbits; the addition of more measurements has weakened the evidence for bimodality. The current sample appears to be consistent with a population of well-aligned systems and a smaller population with nearly random obliquities. This distribution resembles that observed for more massive planets, suggesting that transiting Jupiters and Neptunes originate from similar dynamical processes.

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

2 major / 2 minor

Summary. The manuscript reports new Rossiter-McLaughlin observations of two transiting Neptunes (TOI-181 b with λ ≈ 32° and e < 0.12; TOI-883 b with λ ≈ 22° and e = 0.16 ± 0.03) obtained with Magellan/PFS and WIYN/NEID. After incorporating these and other recent measurements into the literature sample, the authors analyze the obliquity distribution of transiting Neptunes and conclude that it is consistent with a mixture of well-aligned systems plus a smaller population with nearly random orientations. This distribution is stated to resemble that of transiting Jupiters, implying similar dynamical origins via high-eccentricity migration for some systems. The addition of measurements is noted to have weakened earlier evidence for bimodality.

Significance. If the population inference holds after accounting for observational selection, the result would be significant for unifying the dynamical histories of Neptunes and Jupiters. The new RM measurements add concrete data points that help test prior claims of distinct Neptune obliquity behavior. The manuscript provides explicit measured values with uncertainties and notes the change in evidence for bimodality.

major comments (2)
  1. [obliquity distribution analysis (post-observation section)] The central claim that the combined sample 'appears to be consistent with a population of well-aligned systems and a smaller population with nearly random obliquities' (abstract) and resembles the Jupiter distribution is load-bearing on the assumption of an unbiased draw from the underlying obliquity distribution. The manuscript does not describe forward-modeling of the RM selection function (dependent on host brightness, v sin i, transit depth, and geometry), which correlates with stellar and planetary properties and could alter the inferred aligned/random fractions.
  2. [obliquity distribution analysis (post-observation section)] The comparison to the Jupiter obliquity distribution (abstract) requires that the Neptune sample selection effects are comparable to those in the Jupiter RM samples; without explicit modeling or quantification of differential biases, the similarity conclusion rests on an untested assumption.
minor comments (2)
  1. [abstract and methods] The abstract reports specific λ and e values with uncertainties for the two new systems; the corresponding methods, data tables, and fitting details (e.g., how the RM model and eccentricity constraints were derived) should be cross-referenced explicitly in the main text for reproducibility.
  2. [results section] Notation for sky-projected obliquity (λ) and eccentricity (e) is standard, but ensure consistent use of 1σ vs. 2σ confidence intervals across text and any tables/figures.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive feedback, which highlights important considerations for interpreting the obliquity sample. We agree that selection effects warrant explicit discussion and will revise the manuscript accordingly to qualify our conclusions. Point-by-point responses to the major comments follow.

read point-by-point responses
  1. Referee: The central claim that the combined sample 'appears to be consistent with a population of well-aligned systems and a smaller population with nearly random obliquities' (abstract) and resembles the Jupiter distribution is load-bearing on the assumption of an unbiased draw from the underlying obliquity distribution. The manuscript does not describe forward-modeling of the RM selection function (dependent on host brightness, v sin i, transit depth, and geometry), which correlates with stellar and planetary properties and could alter the inferred aligned/random fractions.

    Authors: We agree that a full forward-modeling of the RM selection function would strengthen the statistical interpretation. Our analysis is descriptive of the observed sample and documents the weakening of bimodality evidence with new measurements. In revision we will add a subsection on potential biases, describing how host brightness, v sin i, and transit geometry influence RM detectability, and will explicitly state that the aligned-plus-random fractions are preliminary pending such modeling. revision: yes

  2. Referee: The comparison to the Jupiter obliquity distribution (abstract) requires that the Neptune sample selection effects are comparable to those in the Jupiter RM samples; without explicit modeling or quantification of differential biases, the similarity conclusion rests on an untested assumption.

    Authors: We acknowledge that the resemblance is currently qualitative. While both samples rely on RM measurements of transiting planets around bright hosts, we will revise the discussion to compare median stellar magnitudes, v sin i values, and planetary radii between the Neptune and Jupiter RM samples. This will allow readers to assess the plausibility of comparable biases; we will also note that a joint forward model of both populations lies beyond the present scope. revision: yes

Circularity Check

0 steps flagged

No circularity: distribution analysis uses new independent RM data plus external literature sample

full rationale

The paper's central claim follows from compiling new Rossiter-McLaughlin measurements (TOI-181 b, TOI-883 b) with previously published obliquity values from the literature and inspecting the resulting empirical distribution for consistency with an aligned-plus-isotropic mixture. No equations, fitted parameters, or self-citations are invoked that would make the reported mixture fractions or resemblance to the Jupiter sample tautological by construction. The derivation chain is observational and externally falsifiable; the reader's assessment of score 2 is consistent with the absence of any load-bearing self-referential step.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Based solely on the abstract, the work relies on established observational techniques without introducing new free parameters, axioms beyond standard domain assumptions, or invented entities.

axioms (1)
  • domain assumption The Rossiter-McLaughlin effect modeling assumptions (including stellar rotation, limb darkening, and orbital geometry) are valid for these systems.
    The reported lambda and eccentricity values depend on these standard modeling choices in high-resolution transit spectroscopy.

pith-pipeline@v0.9.0 · 5928 in / 1406 out tokens · 40048 ms · 2026-05-25T07:21:52.965135+00:00 · methodology

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