{
  "abstract": "Stellar obliquity ($λ$) and orbital eccentricity ($e$) trace the dynamical histories of close-in giant planets, but the current observational picture is assembled from heterogeneous analyses that have obscured population-level trends. In this work, we homogeneously refit systems with Rossiter-McLaughlin (RM) measurements by performing a joint global fit to spectral energy distributions, transit light curves, mid-transit times, out-of-transit and in-transit radial velocities, yielding self-consistent posterior distributions for the physical and orbital parameters of both stars and planets across 256 systems. Restricting to 146 single-star systems with reliable planet-mass measurements, we uncover pronounced structure in the $e-λ$ plane that depends on planet mass: (i) sub-Saturns ($M_{\\rm p} \\leq \\sim0.3M_{\\rm J}$) can be both eccentric and misaligned; (ii) Jupiters ($\\sim0.3M_{\\rm J}<M_{\\rm p} \\leq \\sim3 M_{\\rm J}$) are misaligned only on circular orbits; and (iii) super Jupiters and brown dwarfs ($M_{\\rm p}>\\sim3M_{\\rm J}$) are aligned across the full eccentricity range. A two-dimensional Kolmogorov-Smirnov test shows that the joint $(e,λ)$ distributions differ significantly among these three mass regimes. These trends demonstrate that $λ$ depends jointly on eccentricity and planet mass, implying that obliquity alone is not a unique tracer of evolutionary history and underscoring the need for a unified framework for the origins of spin-orbit misalignment. The full catalog from this work is publicly available at https://www.stellarobliquity.com .",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2605.28719",
  "author_total": 3,
  "authors": [
    {
      "name": "Xian-Yu Wang"
    },
    {
      "name": "Songhu Wang"
    },
    {
      "name": "Konstantin Batygin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fytzwxpybaym2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.28719",
  "fulltext_url": null,
  "id": "fytzwxpybaym2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.28719",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.28719",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fytzwxpybaym2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:16Z",
      "native_id": "2605.28719",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.28719"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "A Homogeneous Catalog of Rossiter-McLaughlin Systems: Distinct $e$-$λ$ Trends in Three Gas-Giant Mass Regimes",
  "title_text": "A Homogeneous Catalog of Rossiter-McLaughlin Systems: Distinct e-λ Trends in Three Gas-Giant Mass Regimes",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:16Z",
  "url": "https://research.draconitic.com/paper/fytzwxpybaym2",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/2041-8213/ae907d",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}