{
  "id": "1106.6264",
  "version": "v1",
  "published": "2011-06-30T15:19:01.000Z",
  "updated": "2011-06-30T15:19:01.000Z",
  "title": "Spin equilibrium with or without gravitational wave emission: the case of XTE J1814-338 and SAX J1808.4-3658",
  "authors": [
    "Brynmor Haskell",
    "Alessandro Patruno"
  ],
  "comment": "Submitted to ApJ Letters",
  "categories": [
    "astro-ph.SR",
    "gr-qc"
  ],
  "abstract": "In this letter we present a new analysis of the torques acting on the accreting millisecond X-ray pulsars SAX J1808.4-365 and XTE J1814-338, and show how our results can be used to constrain theoretical models of the spin evolution. In particular we find upper limits on any spin-up/down phase of XTE J1814-338 of $|\\dot{\\nu}|\\lesssim\\,1.5\\times\\,10^{-14}$ Hz/s at 95% confidence level. We examine the possibility that a gravitational wave torque may be acting in these systems and suggest that a more likely scenario is that both systems are close to spin equilibrium, as set by the disc/magnetosphere interaction.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-06-30T15:19:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gravitational wave emission",
      "spin equilibrium",
      "millisecond x-ray pulsars sax j1808",
      "accreting millisecond x-ray pulsars sax",
      "gravitational wave torque"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/2041-8205/738/1/L14",
      "journal": "The Astrophysical Journal",
      "year": 2011,
      "month": "Sep",
      "volume": 738,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 916547,
      "adsabs": "2011ApJ...738L..14H"
    }
  }
}