{
  "abstract": "We use Type II-P supernovae (SNe II-P) observed as part of the Nearby Supernova Factory (SNfactory) experiment as standardizable candles to develop an improved standardization framework. The data consist of accurately flux-calibrated, host-subtracted spectrophotometry of low-redshift SNe II-P in the wavelength range $3200 < λ< 10000$ ${\\unicode{xC5}}$. We develop an improved method to determine the expansion velocities of SNe II-P based on Gaussian Process regression. We extend the conventional standardized candle method (SCM) by an additional correction term containing the H$_α$ absorption-to-emission ratio and a hierarchical Bayesian framework. We find that the additional correction improves the quality of the standardization, particularly around $30$ to $40$ days after the explosion. We are able to reduce the scatter of the Hubble-flow SNe II-P from $0.28$ mag down to $0.18$ mag compared to previous work. As an example application of this methodology we measure $H_0$ using a pre-existing calibrator sample of SNe~II having Cepheid- or TRGB-based distance moduli. We find a value of $H_0 = 70.6^{+4.5}_{-4.3}$ km s$^{-1}$ Mpc$^{-1}$, including only statistical uncertainty, corresponding to a precision of $6.2$%. We find variations of $1.4$ km s$^{-1}$ Mpc$^{-1}$ between hierarchical model variations --- well within our quoted statistical uncertainty. Without the additional correction term, we obtain $H_0 = 73.0^{+6.9}_{-6.1}$ km s$^{-1}$ Mpc$^{-1}$ ($8.9$% precision) highlighting the improved precision of our new methodology. We identify and discuss inconsistencies between the measured parent populations of the calibrator and Hubble-flow standardization characteristics --- present in this and literature samples --- that are not explained by a simple selection on magnitude and which will need to be improved upon as SN II-P samples grow.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.39804",
  "author_total": 44,
  "authors": [
    {
      "name": "A Holas"
    },
    {
      "name": "S Taubenberger"
    },
    {
      "name": "C Vogl"
    },
    {
      "name": "D Rubin"
    },
    {
      "name": "M Vincenzi"
    },
    {
      "name": "W Hillebrandt"
    },
    {
      "name": "G Aldering"
    },
    {
      "name": "P Antilogus"
    },
    {
      "name": "C Aragon"
    },
    {
      "name": "S Bailey"
    },
    {
      "name": "C Baltay"
    },
    {
      "name": "S Benitez-Herrera"
    },
    {
      "name": "S Bongard"
    },
    {
      "name": "K Boone"
    },
    {
      "name": "C Buton"
    },
    {
      "name": "G Csörnyei"
    },
    {
      "name": "Y Copin"
    },
    {
      "name": "S Dixon"
    },
    {
      "name": "M Fink"
    },
    {
      "name": "D Fouchez"
    },
    {
      "name": "E Gangler"
    },
    {
      "name": "R Gupta"
    },
    {
      "name": "B Hayden"
    },
    {
      "name": "E.E.O Ishida"
    },
    {
      "name": "A.G Kim"
    },
    {
      "name": "M Klauser"
    },
    {
      "name": "M Kowalski"
    },
    {
      "name": "M Kromer"
    },
    {
      "name": "D.K Küsters"
    },
    {
      "name": "J Nordin"
    },
    {
      "name": "R Pain"
    },
    {
      "name": "E Pecontal"
    },
    {
      "name": "R Pereira"
    },
    {
      "name": "S Perlmutter"
    },
    {
      "name": "K.A Ponder"
    },
    {
      "name": "D Rabinowitz"
    },
    {
      "name": "M Rigault"
    },
    {
      "name": "K Runge"
    },
    {
      "name": "M Sasdelli"
    },
    {
      "name": "C Saunders"
    },
    {
      "name": "G Smadja"
    },
    {
      "name": "N Suzuki"
    },
    {
      "name": "C Tao"
    },
    {
      "name": "R.C Thomas"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b3z0rfh25zea9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.39804",
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  "id": "b3z0rfh25zea9",
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  "landing_url": "https://hal.science/hal-05786301v1",
  "language": "en",
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  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
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  "native_subjects": [
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  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.39804",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/b3z0rfh25zea9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:50Z",
      "native_id": "hal-05786301",
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      "native_id": "2609.39804",
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
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    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
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  ],
  "title": "An improved standardization framework for Type II-P supernovae using a hierarchical Bayesian approach",
  "title_text": "An improved standardization framework for Type II-P supernovae using a hierarchical Bayesian approach",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:49Z",
  "url": "https://research.draconitic.com/paper/b3z0rfh25zea9",
  "venue": "HAL",
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}