{
  "id": "2204.10767",
  "version": "v1",
  "published": "2022-04-22T15:35:08.000Z",
  "updated": "2022-04-22T15:35:08.000Z",
  "title": "Long-term rotational and emission variability of 17 radio pulsars",
  "authors": [
    "B. Shaw",
    "B. W. Stappers",
    "P. Weltevrede",
    "P. R. Brook",
    "A. Karastergiou",
    "C. A. Jordan",
    "M. J. Keith",
    "M. Kramer",
    "A. G. Lyne"
  ],
  "comment": "20 pages, 16 figures, 3 tables",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "With the ever-increasing sensitivity and timing baselines of modern radio telescopes, a growing number of pulsars are being shown to exhibit transitions in their rotational and radio emission properties. In many of these cases, the two are correlated with pulsars assuming a unique spin-down rate ($\\dot{\\nu}$) for each of their specific emission states. In this work we revisit 17 radio pulsars previously shown to exhibit spin-down rate variations. Using a Gaussian process regression (GPR) method to model the timing residuals and the evolution of the profile shape, we confirm the transitions already observed and reveal new transitions in 8 years of extended monitoring with greater time resolution and enhanced observing bandwidth. We confirm that 7 of these sources show emission-correlated $\\dot{\\nu}$ transitions ($\\Delta \\dot{\\nu}$) and we characterise this correlation for one additional pulsar, PSR B1642$-$03. We demonstrate that GPR is able to reveal extremely subtle profile variations given sufficient data quality. We also corroborate the dependence of $\\Delta \\dot{\\nu}$ amplitude on $\\dot{\\nu}$ and pulsar characteristic age. Linking $\\Delta \\dot{\\nu}$ to changes in the global magnetospheric charge density $\\Delta \\rho$, we speculate that $\\dot{\\nu}$ transitions associated with large $\\Delta \\rho$ values may be exhibiting detectable profile changes with improved data quality, in cases where they have not previously been observed.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-04-22T15:35:08.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "radio pulsars",
      "emission variability",
      "long-term rotational",
      "extremely subtle profile variations",
      "transitions"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}