{
  "abstract": "Acoustic mode frequencies in the Sun and Sun-like stars change due to magnetic activity, on time-scales much larger than the star's rotation and much smaller than its evolution. Given the poor S/N of the observed stellar p-modes, it is challenging to measure the changes of individual mode frequencies. Typically, power spectra of different time series segments are cross-correlated to estimate a mean p-mode frequency change, which ends up averaging over the individual mode contributions. We seek to enhance the cross-correlation method, by introducing a novel and computationally cheap method, thus enabling us to disentangle p-mode frequency changes for different spherical harmonic degree $\\ell$. Assuming that the inclination angle and rotation rate are already measured, filters are designed, which enable the isolation of $δω_\\ell$, frequency changes of modes with a given $\\ell$, while preventing bias creeping in from neighbouring modes. Monte-Carlo simulations are performed to quantify uncertainty in the estimation of $δω_\\ell$. We validate our method against well-studied solar data (SOHO/VIRGO and BiSON) and demonstrate its applicability to the solar-like Kepler star KIC 8006161.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: A&A, 713, L12 (2026)",
  "arxiv": "2608.15364",
  "author_total": 4,
  "authors": [
    {
      "name": "Samarth G. Kashyap"
    },
    {
      "name": "Laurent Gizon"
    },
    {
      "name": "Jesper Schou"
    },
    {
      "name": "Rachel Howe"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8etq2rg3agr04.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.15364",
  "fulltext_url": null,
  "id": "8etq2rg3agr04",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.15364",
  "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.SR"
    ],
    [
      "arxiv",
      "physics.data-an"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.15364",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8etq2rg3agr04.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:07Z",
      "native_id": "2608.15364",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.15364"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.data-an",
      "subfield": "computational"
    }
  ],
  "title": "Determining low-$\\ell$ p-mode frequency shifts in Sun-like stars: Enhancing the cross-correlation technique with filters",
  "title_text": "Determining low-ℓ p-mode frequency shifts in Sun-like stars: Enhancing the cross-correlation technique with filters",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:07Z",
  "url": "https://research.draconitic.com/paper/8etq2rg3agr04",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1051/0004-6361/202661137",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}