{
  "abstract": "Gravitational-wave (GW) signals from compact binary coalescences (CBCs) enable independent measurements of the Hubble constant H ₀ via the spectral siren method, which critically depends on an accurate model of the source-frame mass distribution. While the primary-mass function has been extensively studied, the impact of the secondary-mass distribution on cosmological inference has been largely overlooked. Here, we perform a joint inference of population and cosmological parameters using 142 confident CBC detections from GWTC-4.0, adopting a new parametric model that flexibly describes features in both the component-mass spectrum and the pairing function, with particular emphasis on the secondary masses. We find H 0 = 71 . 4 − 13.4 + 13.8 km s − 1 Mpc − 1 (68% CL) from spectral sirens alone, and H 0 = 73 . 5 − 7.2 + 9.2 km s − 1 Mpc − 1 when combined with the bright siren GW170817. Compared to the standard LIGO–Virgo–KAGRA Collaboration Fullpop-4.0 analysis, these constraints represent improvements of ∼29.8% and ∼22.2% in H ₀ uncertainty, respectively. The enhanced precision is driven by previously unmodeled features, including peaks near 18 M ⊙ and 65 M ⊙ as well as mass-dependent pairing transitions at 28 M ⊙ and 52 M ⊙ . Our results demonstrate that the secondary-mass function is also a key ingredient for precision standard-siren cosmology.",
  "abstract_shown": true,
  "affiliations": [
    "Key Laboratory of Dark Matter and Space Astronomy",
    "Zhejiang University of Technology",
    "University of Science and Technology of China"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Yin-Jie Li",
      "orcid": "0000-0001-5087-9613"
    },
    {
      "affs": [
        0
      ],
      "name": "Yi-Ying Wang",
      "orcid": "0000-0003-1215-6443"
    },
    {
      "affs": [
        1
      ],
      "name": "Yuan-Zhu Wang",
      "orcid": "0000-0001-9626-9319"
    },
    {
      "affs": [
        0
      ],
      "name": "Shao-Peng Tang",
      "orcid": "0000-0001-9120-7733"
    },
    {
      "affs": [
        0,
        2
      ],
      "name": "Yi-Zhong Fan",
      "orcid": "0000-0002-8966-6911"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dqzrycd7s6s6m.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea3fc",
  "fulltext_url": null,
  "id": "dqzrycd7s6s6m",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea3fc",
  "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|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7220921183",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea3fc/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/dqzrycd7s6s6m.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea3fc",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea3fc"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Pulsars and Gravitational Waves Research",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Secondary-mass Features Improve Spectral-siren H ₀ Constraints",
  "title_text": "Secondary-mass Features Improve Spectral-siren H ₀ Constraints",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/dqzrycd7s6s6m",
  "venue": "The Astrophysical Journal",
  "versions": []
}