{
  "abstract": "PDS~70, the only system with two directly imaged protoplanets embedded in their natal disk, is a benchmark for giant-planet formation theory. Interpreting the planetary luminosities requires a precise age for the host star, but the widely adopted isochronal age of $5.4\\pm1.0$~Myr is substantially younger than ages inferred for the Upper Centaurus--Lupus (UCL) population with which it is associated. We address this discrepancy by determining a new kinematic age for PDS~70 using radial velocities for 405 candidate members of the Scorpius--Centaurus T subcomponent from the Wide Field Spectrograph (WiFeS) on the ANU 2.3~m telescope, reducing uncertainties by a factor of $\\sim5.5$ compared to \\textit{Gaia}. %We supplement these measurements with H$α$ and lithium equivalent widths as youth diagnostics. We combine these with \\textit{Gaia} DR3 astrometry in the \\texttt{Chronostar} kinematic reconstruction framework to derive a posterior-weighted kinematic age of approximately $10$--$15$~Myr for all the T subcomponent stars, with a kinematic age of $\\approx 12$--$16$~Myr for PDS 70, ruling out ages as young as the published isochronal estimate. At this kinematic age, PDS~70~\\textit{b}'s (and to a lesser extent, PDS~70~\\textit{c}'s) luminosity is incompatible with warm-start cooling tracks under current dynamical mass constraints. The most natural interpretation is that PDS~70~\\textit{b} formed $\\approx10.5$ Myr after its host star, and no less than $\\approx7.7$ Myr after it.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.25987",
  "author_total": 3,
  "authors": [
    {
      "name": "Arunima Arunima"
    },
    {
      "name": "Mike Ireland"
    },
    {
      "name": "Mark Krumholz"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/31ab9qr7hf1p8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.25987",
  "fulltext_url": null,
  "id": "31ab9qr7hf1p8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.25987",
  "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.GA"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7223062043",
  "pdf_url": "https://arxiv.org/pdf/2610.25987",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/31ab9qr7hf1p8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.25987",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.25987"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Kinematic structure and age of a Scorpius--Centaurus subcomponent: implications for PDS 70 planetary system",
  "title_text": "Kinematic structure and age of a Scorpius--Centaurus subcomponent: implications for PDS 70 planetary system",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/31ab9qr7hf1p8",
  "venue": "arXiv",
  "versions": []
}