{
  "abstract": "Blue large-amplitude pulsators (BLAPs) are rare, hot, short-period pulsating stars whose rapid oscillations provide a unique probe of stellar interiors and atmospheres. In this paper, we study two short-period BLAPs in the Galactic bulge, OGLE-BLAP-142 ($P \\approx 6.6$ min) and OGLE-BLAP-148 ($P \\approx 7.5$ min), by combining light curves from the OGLE, KMTNet, and DREAMS surveys, spanning 17 years with cadences ranging from minutes to hours to days. We perform Generalized Lomb-Scargle periodogram analyses of their light curves and identify, for each BLAP, three closely spaced pulsation modes separated by $\\sim 1\\%$. The dominant mode can switch within timescales of order a year, accompanied by a likely blueward color shift ($\\sim 0.1$--$0.2$ mag). The yearly period excursions of the resolved mode families imply apparent $|\\dot{P}/P|$ values of order $10^{-6}$--$10^{-4}\\,\\mathrm{yr^{-1}}$, large enough to mimic or exceed smooth evolutionary period changes. One mode family in OGLE-BLAP-148 shows a coherent decade-long drift at the $\\sim10^{-5}\\,\\mathrm{yr^{-1}}$ level, but its failure to extrapolate to the earliest and latest epochs suggests a transient mode-family drift rather than secular evolution. Such close-spaced multiple pulsations and mode switching may be common among BLAPs with periods shorter than 10 min, and their physical origin remains unclear.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.18300",
  "author_total": 23,
  "authors": [
    {
      "name": "Hao Ma"
    },
    {
      "name": "Shude Mao"
    },
    {
      "name": "Seung-Lee Kim"
    },
    {
      "name": "Hongjing Yang"
    },
    {
      "name": "Weicheng Zang"
    },
    {
      "name": "Tianjun Gan"
    },
    {
      "name": "Steve Heathcote"
    },
    {
      "name": "Chung-Uk Lee"
    },
    {
      "name": "Tao Wu"
    },
    {
      "name": "Dong-Jin Kim"
    },
    {
      "name": "Zhenhao Wang"
    },
    {
      "name": "Yaosong Yu"
    },
    {
      "name": "Qiyue Qian"
    },
    {
      "name": "Yuchen Tang"
    },
    {
      "name": "Yuxin Shang"
    },
    {
      "name": "Zhixing Li"
    },
    {
      "name": "Tomas Ahumada"
    },
    {
      "name": "Timothy Abbott"
    },
    {
      "name": "Guillermo Damke"
    },
    {
      "name": "Konstantina Boutsia"
    },
    {
      "name": "Alfredo Zenteno"
    },
    {
      "name": "Przemek Mróz"
    },
    {
      "name": "Andong Xu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bgx35gmtxyg6d.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.18300",
  "fulltext_url": null,
  "id": "bgx35gmtxyg6d",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.18300",
  "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"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7213507173",
  "pdf_url": "https://arxiv.org/pdf/2609.18300",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bgx35gmtxyg6d.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:01Z",
      "native_id": "2609.18300",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.18300"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Mode Switching in Two Blue Large Amplitude Pulsators observed by OGLE, KMTNet and DREAMS",
  "title_text": "Mode Switching in Two Blue Large Amplitude Pulsators observed by OGLE, KMTNet and DREAMS",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:17Z",
  "url": "https://research.draconitic.com/paper/bgx35gmtxyg6d",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/1538-4357/aea902",
      "pid": "7p4h9zares3ad",
      "relation": "published-as",
      "title": "Mode Switching in Two Blue Large-amplitude Pulsators Observed by OGLE, KMTNet, and DREAMS",
      "venue": "The Astrophysical Journal"
    }
  ]
}