{
  "abstract": "We present the discovery and subsequent 3.2 year monitoring campaign of the repeating fast radio burst FRB 20220529A with CHIME/FRB. We observe a gradual dispersion measure (DM) decline of $-0.881\\pm0.001~\\mathrm{pc}~\\mathrm{cm}^{-3}~\\mathrm{year}^{-1}$ ($-1.235\\pm0.001~\\mathrm{pc}~\\mathrm{cm}^{-3}~\\mathrm{year}^{-1}$ in the rest frame), implying a $\\geq3.5\\pm0.2$% decrease of the total electron column in the source environment, and we see scattering timescale variations over weeks to years. We observe a short-lived excursion in which the DM rises by $\\sim 1~\\mathrm{pc}~\\mathrm{cm}^{-3}$, immediately preceding a transient $\\sim 2000~\\mathrm{rad}~\\mathrm{m}^{-2}$ Faraday rotation measure (RM) increase previously reported for this source, before returning to its gradual DM decline. We identify a local line-of-sight magnetic field around FRB 20220529A during this DM/RM excursion of $3.4 \\pm 0.2~\\mathrm{mG}$, corresponding to one of the most strongly magnetized FRB environments. We measure a decrease in the linear polarization fraction of FRB 20220529A bursts with decreasing frequency that we attribute to depolarization from multi-path propagation in the source environment. We also place a $5σ$ upper limit on the spectral luminosity of an associated persistent radio source of $\\leq 5\\times10^{28}~\\mathrm{erg}~\\mathrm{s}^{-1}~\\mathrm{Hz}^{-1}$ at 1.5 GHz. These observations are consistent with FRB 20220529A originating from a young ($\\sim$ years to centuries old) expanding supernova remnant, with short-lived DM and RM variability arising from interactions with the supernova remnant or with a binary companion.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2602.22309",
  "author_total": 32,
  "authors": [
    {
      "name": "Ayush Pandhi"
    },
    {
      "name": "Kenzie Nimmo"
    },
    {
      "name": "Shion Andrew"
    },
    {
      "name": "Charanjot Brar"
    },
    {
      "name": "Shami Chatterjee"
    },
    {
      "name": "Amanda M Cook"
    },
    {
      "name": "Alice Curtin"
    },
    {
      "name": "B.M Gaensler"
    },
    {
      "name": "Marcin Gawroński"
    },
    {
      "name": "Jason Hessels"
    },
    {
      "name": "Victoria M Kaspi"
    },
    {
      "name": "Afrokk Khan"
    },
    {
      "name": "Franz Kirsten"
    },
    {
      "name": "Mattias Lazda"
    },
    {
      "name": "Calvin Leung"
    },
    {
      "name": "Robert Main"
    },
    {
      "name": "Kiyoshi W Masui"
    },
    {
      "name": "Ryan Mckinven"
    },
    {
      "name": "Daniele Michilli"
    },
    {
      "name": "Mason Ng"
    },
    {
      "name": "Omar Ould-Boukattine"
    },
    {
      "name": "Aaron B Pearlman"
    },
    {
      "name": "Ziggy Pleunis"
    },
    {
      "name": "Alexander W Pollak"
    },
    {
      "name": "Sachin Pradeep E T."
    },
    {
      "name": "Weronika Puchalska"
    },
    {
      "name": "Mawson W Sammons"
    },
    {
      "name": "Paul Scholz"
    },
    {
      "name": "Vishwangi Shah"
    },
    {
      "name": "Kaitlyn Shin"
    },
    {
      "name": "Seth R Siegel"
    },
    {
      "name": "Kendrick Smith"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d97k0hm8h64b9.bib",
  "cited_by": 6,
  "doi": "10.3847/2041-8213/ae52f8",
  "fulltext_url": null,
  "id": "d97k0hm8h64b9",
  "issns": [],
  "landing_url": "https://hal.science/hal-05549638v1",
  "language": "en",
  "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": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.astr"
    ],
    [
      "openalex",
      "3103|Gamma-ray bursts and supernovae"
    ]
  ],
  "openalex": "W7143383619",
  "pdf_url": "https://hal.science/hal-05549638/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-31",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/d97k0hm8h64b9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:21Z",
      "native_id": "hal-05549638",
      "source": "hal",
      "url": "https://hal.science/hal-05549638v1"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Gamma-ray bursts and supernovae",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "A steadily declining dispersion measure for the repeating fast radio burst FRB 20220529A: Evidence for an FRB engine embedded in an expanding supernova remnant",
  "title_text": "A steadily declining dispersion measure for the repeating fast radio burst FRB 20220529A: Evidence for an FRB engine embedded in an expanding supernova remnant",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:21Z",
  "url": "https://research.draconitic.com/paper/d97k0hm8h64b9",
  "venue": "Astrophys.J.Lett.",
  "versions": []
}