{
  "abstract": "An explorative study of Type Ia Supernovae (SNe Ia) light curves is presented. $Δm_{t}(X)$ decline-rate metrics are used to evaluate alternative characterisations of light curve diversity and the Luminosity-Width Relation (LWR). Using a sample of 362 SNe Ia from the Carnegie Supernova Project (CSP-I and CSP-II), Gaussian Process regression is used to fit $B$- and $g$-band light curves and measure decline-rates across multiple post-maximum timescales. The LWR is calibrated using a clean subsample of SNe Ia with host-independent distance moduli and Fitzpatrick (1999) reddening corrections. Decline-rates $Δm_{10}(B)$ and $Δm_{10}(g)$ are found to capture the LWR effectively, while mitigating the severe degeneracy that affects longer timescales for fast-declining ($Δm_{15}(B) \\geq 1.6$ mag) events. Continuous, piecewise linear models are presented that seamlessly anchor the transition between normal and fast-declining regimes. The decline-rate $Δm_{10}(X)$ closely approximates the results of the more complex colour-stretch parameters, requiring less post-maximum temporal coverage than $Δm_{15}(B)$ or $s_{BV}$, and offers an even greater sensitivity for slow decliners. $Δm_{10}(B)$ provides a precise and practical tool for large-scale photometric surveys and real-time observer classification.photometric surveys and real-time observer classification.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.10815",
  "author_total": 11,
  "authors": [
    {
      "name": "Joel M. Velasco"
    },
    {
      "name": "Paolo A. Mazzali"
    },
    {
      "name": "Christopher Ashall"
    },
    {
      "name": "Christopher R. Burns"
    },
    {
      "name": "Mark M. Phillips"
    },
    {
      "name": "Lluis Galbany"
    },
    {
      "name": "Nidia Morrell"
    },
    {
      "name": "Maximilian D. Stritzinger"
    },
    {
      "name": "Peter Hoeflich"
    },
    {
      "name": "Eric Y. Hsiao"
    },
    {
      "name": "Syed A. Uddin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3bgvf6wn4yd9g.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.10815",
  "fulltext_url": null,
  "id": "3bgvf6wn4yd9g",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.10815",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.10815",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3bgvf6wn4yd9g.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2610.10815",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.10815"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Shortening the Baseline: Characterising Type Ia Supernovae Using $Δm_{10}(X)$",
  "title_text": "Shortening the Baseline: Characterising Type Ia Supernovae Using Δm_10(X)",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/3bgvf6wn4yd9g",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1093/mnras/stag1907",
      "pid": "35ryjvwxscmwq",
      "relation": "published-as",
      "title": "Shortening the baseline: characterising Type Ia supernovae using Δ m 10( X )",
      "venue": "Monthly Notices of the Royal Astronomical Society"
    }
  ]
}