{
  "abstract": "Super-Earths are commonly found with cold Jupiters, yet it is unclear whether these Super-Earth-Cold-Jupiter (SE-CJ) systems differ architecturally from other Kepler-like systems (Non-SE-CJ). One might expect the CJs to excite eccentricities and mutual inclinations among the SEs. We use two metrics: the normalized transit duration $T/T_0$, set by the host-star density, and the pairwise duration ratio $ξ$ between neighboring transiting planets. We find no population-level difference in $T/T_0$ between the samples. Forward modeling of $ξ$, which is more directly sensitive to mutual inclinations because it isolates the impact-parameter contrast, finds no evidence that SE-CJ systems are more mutually inclined than Non-SE-CJ systems, and hints they could be even flatter. We infer a Rayleigh dispersion in mutual inclination of $δ\\approx 1.0^\\circ$, or a characteristic eccentricity of $e \\approx 0.035$ (assuming equipartition), compared with $δ\\approx 1.5^\\circ$ and $e \\approx 0.05$ for Non-SE-CJ systems. Many SE-CJ systems therefore retain nearly coplanar, low-eccentricity architectures despite hosting distant giants. We further show that secular coupling among the inner Super-Earths usually dominates over forcing from the cold Jupiter, leaving the inner planets resistant to excitation. Our analysis is limited to SE-CJ systems with multiple transiting SEs: systems in which the CJ has strongly excited the inner architecture are expected to present as single-transiting, and cannot be studied with the $ξ$ metric. Another caveat of our result is that undetected cold Jupiters in the comparison sample could dilute the measured $ξ$ distribution.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.05963",
  "author_total": 6,
  "authors": [
    {
      "name": "Tom Lassmann"
    },
    {
      "name": "Joseph Hand"
    },
    {
      "name": "Fei Dai"
    },
    {
      "name": "Jiaxin Tang"
    },
    {
      "name": "Sharon Wang"
    },
    {
      "name": "Di-Chang Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9nt9q1q0fseyd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.05963",
  "fulltext_url": null,
  "id": "9nt9q1q0fseyd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.05963",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.05963",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9nt9q1q0fseyd.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T15:20:56Z",
      "native_id": "2611.05963",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.05963"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "Orbital Architecture of Super-Earth-Cold-Jupiter Systems from Transit Duration Ratios",
  "title_text": "Orbital Architecture of Super-Earth-Cold-Jupiter Systems from Transit Duration Ratios",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:10Z",
  "url": "https://research.draconitic.com/paper/9nt9q1q0fseyd",
  "venue": "arXiv",
  "versions": []
}