{
  "annotation_id": "ec1b3c60-8b01-41a0-bda3-7aeafa198d55",
  "date_created": "2026-02-17T05:53:12.329000Z",
  "date_modified": "2026-02-17T05:53:12.329000Z",
  "file_hash": "405416aa33cb537a0f01d69d28f9db67e971e185a30caf911dfc1e0770b6465f",
  "private": false,
  "record": {
    "abstract": "Stellar bow shocks are formed when an outflow interacts with the interstellar medium. In white dwarfs accreting from a binary companion, outflows are associated with either strong winds from the donor star, the accretion disk, or a thermonuclear runaway explosion on the white dwarf surface. To date, only six accreting white dwarfs are known to harbour disk-wind driven bow shocks that are not associated to thermonuclear explosions. Here, we report the discovery of a bow shock associated with a high-proper-motion disk-less accreting white dwarf, 1RXS J052832.5+283824. We show that the white dwarf has a strong magnetic field in the range B~42-45 MG, making RXJ0528+2838 the a bonafide known polar-type cataclysmic variable harbouring a bow shock. The resolved bow shock is shown to be inconsistent with a past thermonuclear explosion, or being inflated by a donor wind, ruling out all accepted scenarios for inflating a bow shock around this system. Modelling of the energetics reveals that the observed bow shock requires a persistent power source with a luminosity significantly exceeding the system accretion energy output. This implies the presence of a powerful, previously unrecognized energy loss mechanism - potentially tied to magnetic activity - that may operate over sufficiently long timescales to influence the course of binary evolution.",
    "arxiv_id": "2601.07922",
    "authors": [
      "Krystian Ikiewicz",
      "Simone Scaringi",
      "Domitilla de Martino",
      "Christian Knigge",
      "Sara E. Motta",
      "Nanda Rea",
      "David Buckley",
      "Noel Castro Segura",
      "Paul J. Groot",
      "Anna F. McLeod",
      "Luke T. Parker",
      "Martina Veresvarska"
    ],
    "categories": [
      "astro-ph.SR",
      "astro-ph.HE"
    ],
    "doi": "10.1038/s41550-025-02748-8",
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "A persistent bow shock in a diskless magnetised accreting white dwarf",
    "url": "https://arxiv.org/abs/2601.07922",
    "version": "v2"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "fc9a39c9-541a-446c-a64d-8abf2c215685",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}