{
  "id": "2006.13233",
  "version": "v1",
  "published": "2020-06-23T18:00:06.000Z",
  "updated": "2020-06-23T18:00:06.000Z",
  "title": "The Effect of Misalignment between Rotation Axis and Magnetic Field on Circumstellar Disk",
  "authors": [
    "Shingo Hirano",
    "Yusuke Tsukamoto",
    "Shantanu Basu",
    "Masahiro N. Machida"
  ],
  "comment": "27 pages, 21 figures, 2 tables, Accepted for publication in ApJ",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "The formation of circumstellar disks is investigated using three-dimensional resistive magnetohydrodynamic simulations, in which the initial prestellar cloud has a misaligned rotation axis with respect to the magnetic field. We examine the effects of (i) the initial angle difference between the global magnetic field and the cloud rotation axis ($\\theta_0$) and (ii) the ratio of the thermal to gravitational energy ($\\alpha_0$). We study $16$ models in total and calculate the cloud evolution until $\\sim \\! 5000$ yr after protostar formation. Our simulation results indicate that an initial non-zero $\\theta_0$ ($> 0$) promotes the disk formation but tends to suppress the outflow driving, for models that are moderately gravitationally unstable, $\\alpha_0 \\lesssim 1$. In these models, a large-sized rotationally-supported disk forms and a weak outflow appears, in contrast to a smaller disk and strong outflow in the aligned case ($\\theta_0 = 0$). Furthermore, we find that when the initial cloud is highly unstable with small $\\alpha_0$, the initial angle difference $\\theta_0$ does not significantly affect the disk formation and outflow driving.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-06-23T18:00:06.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "circumstellar disk",
      "initial angle difference",
      "misalignment",
      "disk formation",
      "cloud rotation axis"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 27,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}