{
  "abstract": "Using corrected long-baseline Kepler and TESS photometry, we investigated the pulsation modulation of the δ Scuti star KIC 4737720. The observed frequency ratio F ₀ / F ₁ ≃ 0.77 is compatible with interpreting F ₀ and F ₁ as candidate radial fundamental and first-overtone modes, although the rapid rotation of the star prevents a secure mode identification. Hilbert-envelope analysis reveals a quasi-triplet centered on F T that satisfies F ₀ ≃ F T − f m1 + f m2 . Because the component at the F ₀ sidelobe position becomes dominant during part of the Kepler observations, this structure is difficult to explain solely by simple weak modulation and may also involve nonlinear modulation, combination frequencies, or mode coupling. Fixed-frequency time-dependent analysis of the Kepler data shows that the dominant component changes from F ₀ = 19.204794 day ⁻¹ to F ₁ = 24.89813 day ⁻¹ , whereas both the 600 s and 200 s TESS data independently identify F T = 20.37206 day ⁻¹ as the highest-amplitude component at the later epoch. The principal frequency positions remain nearly stable, indicating that the observed variability is dominated by changes in the relative amplitudes of the frequency components rather than by secular frequency drift. The agreement between f rot sin i = 1.19 ± 0.06 day − 1 and f m1 ≃ 1.23 day ⁻¹ suggests that stellar rotation may set the characteristic timescale of the modulation. Target-pixel-file diagnostics further show that the V-shaped frequency drifts in the range 15–18 day ⁻¹ recur on a timescale close to the Kepler annual roll period, indicating that they are most likely instrumental in origin.",
  "abstract_shown": true,
  "affiliations": [
    "Chinese Academy of Sciences",
    "University of Chinese Academy of Sciences",
    "Chinese Academy of Sciences South America Center for Astronomy",
    "Instituto de Astrofísica de Andalucía - CSIC",
    "School of Physical Science and Technology Xinjiang University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 7,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Jianwei Yao",
      "orcid": "0009-0000-2772-2677"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Ali Esamdin",
      "orcid": "0000-0003-1845-4900"
    },
    {
      "affs": [
        2
      ],
      "name": "Haozhi Wang",
      "orcid": "0000-0002-2463-4943"
    },
    {
      "affs": [
        0,
        3
      ],
      "name": "Chenglong Lv",
      "orcid": "0000-0001-6354-1646"
    },
    {
      "affs": [
        0
      ],
      "name": "Shuguo Ma",
      "orcid": "0000-0001-5066-5682"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Ayzada Jumahali",
      "orcid": "0000-0001-9600-963X"
    },
    {
      "affs": [
        4
      ],
      "name": "Kedieryemu Kamili",
      "orcid": "0009-0008-7094-1304"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8gamt17m98hwh.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea20a",
  "fulltext_url": null,
  "id": "8gamt17m98hwh",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea20a",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7222313169",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea20a/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/8gamt17m98hwh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea20a",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea20a"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Study of Special Pulsation Modulation Phenomena: A Case Study of the δ Scuti Star KIC 4737720",
  "title_text": "Study of Special Pulsation Modulation Phenomena: A Case Study of the δ Scuti Star KIC 4737720",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/8gamt17m98hwh",
  "venue": "The Astrophysical Journal",
  "versions": []
}