{
  "abstract": "Context. The DART impact might have substantially modified the surface and near-surface structure of Dimorphos, affecting the morphology and gravity field that is to be measured by ESA's Hera mission. Aims. We investigate the post-impact redistribution of ejecta and its dependence on the assumed internal structure of Dimorphos. Methods. We performed high-resolution SPH simulations of the DART impact into two low-cohesion rubble-pile models, with and without a large central boulder. We followed the processes of ejecta re-accumulation and gravity evolution for six hours. Results. The impact ejects about 13% of Dimorphos's mass, most of which is re-accreted, producing near-global resurfacing. The ejecta blanket exceeds 8 m around the impact depression but is only a few tens of centimetres thick near the antipode, with similar large-scale deposition in both interior models. Local gravity changes reach about 10% of the pre-impact value. The central boulder affects the surface gravity only within the impact depression, where the removal of overlying material enhances its gravitational contribution. Conclusions. Hera will observe a surface and gravity field substantially modified by DART, which must be considered when interpreting measurements in terms of the internal structure of Dimorphos.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.35718",
  "author_total": 3,
  "authors": [
    {
      "name": "S. D. Raducan"
    },
    {
      "name": "Ö. Karatekin"
    },
    {
      "name": "M. Popescu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/89acmenq4ksza.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.35718",
  "fulltext_url": null,
  "id": "89acmenq4ksza",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.35718",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.35718",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/89acmenq4ksza.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.35718",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.35718"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "Post-DART impact ejecta re-accumulation on Dimorphos and implications for Hera gravity measurements",
  "title_text": "Post-DART impact ejecta re-accumulation on Dimorphos and implications for Hera gravity measurements",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/89acmenq4ksza",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1051/0004-6361/202662657",
      "pid": "dhm54fqqpekr1",
      "relation": "published-as",
      "title": "Post-DART impact ejecta re-accumulation on Dimorphos and implications for Hera gravity measurements",
      "venue": "Astronomy & Astrophysics"
    }
  ]
}