{
  "abstract": "Binary stars are the progenitors of exotic objects, such as supernovae and gravitational wave sources. However, some systems merge earlier when the primary expands into a giant star at the end of its lifetime on the main sequence and causes its companion to spiral in. TYC 4144-329-2 is a candidate post-merger first ascent giant star with a circumstellar disk seen in the infrared (IR). We detect weak X-ray and far ultraviolet (FUV) emission from TYC 4144-329-2, which we interpret as a signature of weak coronal activity. We also find variability in Ha line profiles and in the optical light curves and we suggest an intermediate geometry where the line-of-sight passes through the upper layers of a flared disk with a time variable column density. While the X-rays must be coronal, the Ha line profiles point to ongoing and variable accretion. We suggest that TYC 4144-329-2's merger was more recent than other stars in this class and that it did not yet have time to develop a deep convection zone. If this scenario holds, TYC 4144-329-2 would be a unique probe of the earliest stages in the evolution of post-merger systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.15652",
  "author_total": 6,
  "authors": [
    {
      "name": "Hans Moritz Günther"
    },
    {
      "name": "C. Melis"
    },
    {
      "name": "K. J. Shen"
    },
    {
      "name": "Eric G. Blackman"
    },
    {
      "name": "K. Hoadley"
    },
    {
      "name": "P. C. Schneider"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/07af8zjy1t6cv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.15652",
  "fulltext_url": null,
  "id": "07af8zjy1t6cv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.15652",
  "language": null,
  "licence": "CC-BY-SA-4.0",
  "licence_label": "CC BY-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.15652",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/07af8zjy1t6cv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2609.15652",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.15652"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Stellar activity in a post-merger Giant star",
  "title_text": "Stellar activity in a post-merger Giant star",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/07af8zjy1t6cv",
  "venue": "arXiv",
  "versions": []
}