{
  "id": "2005.05345",
  "version": "v1",
  "published": "2020-05-11T18:00:06.000Z",
  "updated": "2020-05-11T18:00:06.000Z",
  "title": "Non-ideal magnetohydrodynamics vs turbulence I: Which is the dominant process in protostellar disc formation?",
  "authors": [
    "James Wurster",
    "Benjamin T. Lewis"
  ],
  "comment": "Accepted for publication in MNRAS. 12 pages, 8 figures",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP",
    "astro-ph.GA"
  ],
  "abstract": "Non-ideal magnetohydrodynamics (MHD) is the dominant process. We investigate the effect of magnetic fields (ideal and non-ideal) and turbulence (sub- and transsonic) on the formation of circumstellar discs that form nearly simultaneously with the formation of the protostar. This is done by modelling the gravitational collapse of a 1~M$_\\odot$ gas cloud that is threaded with a magnetic field and imposed with both rotational and turbulent velocities. We investigate magnetic fields that are parallel/anti-parallel and perpendicular to the rotation axis, two rotation rates and four Mach numbers. Disc formation occurs preferentially in the models that include non-ideal MHD where the magnetic field is anti-parallel or perpendicular to the rotation axis. This is independent of the initial rotation rate and level of turbulence, suggesting that subsonic turbulence plays a minimal role in influencing the formation of discs. Aside from first core outflows which are influenced by the initial level of turbulence, non-ideal MHD processes are more important than turbulent processes during the formation of discs around low-mass stars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-05-11T18:00:06.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "protostellar disc formation",
      "non-ideal magnetohydrodynamics",
      "dominant process",
      "magnetic field",
      "rotation axis"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}