{
  "abstract": "We compared 450 and 850 $μ$m POL-2 observations from the James Clerk Maxwell Telescope at $12.6''$ resolution. The median absolute difference in polarization angle between bands is $6.7^\\circ$ across 21 regions. For total intensity $I\\proptoν^α$ and polarized intensity $PI\\proptoν^γ$, 24-27 of 35 regions have $γ<α$, allowing for $3σ$ limits on weak polarized intensities. The median $γ-α$ is $-0.51$, ranging from $-0.57$ to $-0.45$ under these limits. The ratio of polarization fractions is $P_{450}/P_{850}=0.69\\pm0.02_{\\rm sys}\\pm0.03_{\\rm stat}$, with no detected dependence on the angle difference. We suggest that the dependence of alignment on grain size offers the simplest explanation of these findings. For optically thin components sharing a polarization angle and opacity law, temperature mixing reproduces the median $-0.51$ only if the warm dust is polarized less efficiently than the cold dust. If the cold dust is at 10 K or warmer and the warm dust at 40 K or cooler, the median requires a ratio of warm to cold effective polarization efficiencies $r\\lesssim0.18$. We tested mixtures with opacity index $β=2$ in four fields against Herschel dust temperatures and Green Bank Ammonia Survey kinetic temperatures. We assumed equal gas and dust temperatures, ammonia tracing cold gas, and model ranges of 3-20 K for cold dust and 25-40 K for warm dust carrying at most half the mass. Mixtures matching both temperatures cannot reproduce $γ-α$ within $1σ$ in three fields, including OMC 2 tentatively, even for $r=0$. Allowing warm dust at 10-100 K and up to 95% of the mass permits solutions only for $r\\leq0.041$. To explain these three fields by temperature mixing, we need wider model ranges and a very strong contrast in polarization efficiency. The origin of this contrast remains undetermined.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.29285",
  "author_total": 68,
  "authors": [
    {
      "name": "Ray S. Furuya"
    },
    {
      "name": "David Berry"
    },
    {
      "name": "Pierre Bastien"
    },
    {
      "name": "Tetsuo Hasegawa"
    },
    {
      "name": "Masafumi Matsumura"
    },
    {
      "name": "Thiem Hoang"
    },
    {
      "name": "Lapo Fanciullo"
    },
    {
      "name": "Kazunari Iwasaki"
    },
    {
      "name": "Simon Coudé"
    },
    {
      "name": "Takashi Onaka"
    },
    {
      "name": "Pham Ngoc Diep"
    },
    {
      "name": "Sarah Sadavoy"
    },
    {
      "name": "Hua-bai Li"
    },
    {
      "name": "Koji Kawabata"
    },
    {
      "name": "Doris Arzoumanian"
    },
    {
      "name": "Yasuo Doi"
    },
    {
      "name": "Jia-Wei Wang"
    },
    {
      "name": "Tao-Chung Ching"
    },
    {
      "name": "Janik Karoly"
    },
    {
      "name": "Jihye Hwang"
    },
    {
      "name": "Glenn J. White"
    },
    {
      "name": "A-Ran Lyo"
    },
    {
      "name": "Kohji Tomisaka"
    },
    {
      "name": "Le Ngoc Tram"
    },
    {
      "name": "Frédérick Poidevin"
    },
    {
      "name": "Valentin J. M. Le Gouellec"
    },
    {
      "name": "Hiroko Shinnaga"
    },
    {
      "name": "Masato I. N. Kobayashi"
    },
    {
      "name": "Junhao Liu"
    },
    {
      "name": "Mehrnoosh Tahani"
    },
    {
      "name": "Nguyen Bich Ngoc"
    },
    {
      "name": "Jennifer Hatchell"
    },
    {
      "name": "Archana Soam"
    },
    {
      "name": "Hsi-Wei Yen"
    },
    {
      "name": "Chakali Eswaraiah"
    },
    {
      "name": "Vera Könyves"
    },
    {
      "name": "Jintai Wu"
    },
    {
      "name": "Jeong-Eun Lee"
    },
    {
      "name": "Yusuke Tsukamoto"
    },
    {
      "name": "Ekta Sharma"
    },
    {
      "name": "Tie Liu"
    },
    {
      "name": "Qilao Gu"
    },
    {
      "name": "Hiroyuki Nakanishi"
    },
    {
      "name": "Tsuyoshi Inoue"
    },
    {
      "name": "Fumitaka Nakamura"
    },
    {
      "name": "Rachel Friesen"
    },
    {
      "name": "Jean-François Robitaille"
    },
    {
      "name": "Yoshiaki Misugi"
    },
    {
      "name": "Raiga Kashiwagi"
    },
    {
      "name": "Per Friberg"
    },
    {
      "name": "Sarah Graves"
    },
    {
      "name": "Mark Rawlings"
    },
    {
      "name": "Harriet Parsons"
    },
    {
      "name": "David Eden"
    },
    {
      "name": "Huei-Ru Vivien Chen"
    },
    {
      "name": "Najimudeen Bijas"
    },
    {
      "name": "Motohide Tamura"
    },
    {
      "name": "Tyler L. Bourke"
    },
    {
      "name": "Nagayoshi Ohashi"
    },
    {
      "name": "Woojin Kwon"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7jfw9wpxjb2cb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.29285",
  "fulltext_url": null,
  "id": "7jfw9wpxjb2cb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.29285",
  "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.GA"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ],
    [
      "openalex",
      "3103|Astrophysics and Star Formation Studies"
    ]
  ],
  "openalex": "W7223227885",
  "pdf_url": "https://arxiv.org/pdf/2610.29285",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7jfw9wpxjb2cb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:19Z",
      "native_id": "2610.29285",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.29285"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    }
  ],
  "title": "B-fields In STar-forming Region Observations (BISTRO): Dual-Wavelength Constraints on Size-Dependent Grain Alignment in Star-Forming Regions",
  "title_text": "B-fields In STar-forming Region Observations (BISTRO): Dual-Wavelength Constraints on Size-Dependent Grain Alignment in Star-Forming Regions",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:19Z",
  "url": "https://research.draconitic.com/paper/7jfw9wpxjb2cb",
  "venue": "arXiv",
  "versions": []
}