{
  "annotation_id": "eb2a439b-4b07-4cbd-99d4-14d5b3eed368",
  "date_created": "2026-02-17T05:53:16.126000Z",
  "date_modified": "2026-02-17T05:53:16.126000Z",
  "file_hash": "f4df3c13b1c16199ee9ca7254d77dc0850d620d3e05034438bd257a33bdb0edb",
  "private": false,
  "record": {
    "abstract": "PSR J1455$-$3330 is a $\\sim$7.98 ms pulsar in a $\\sim$76.17 day nearly circular orbit with a white dwarf companion. In this work, we combine the available Lovell, Nan\\c{c}ay decimetric Radio Telescope, Green Bank, and MeerKAT pulsar timing data spanning $\\sim$ 30 years to measure the kinematic and relativistic effects of PSR J1455$-$3330 to constrain its 3D orbital geometry and component masses. We detect a relativistic Shapiro delay signal. We measure a significant orthometric amplitude $h_3 = 0.307^{+0.022}_{-0.026}$ $\\mu$s and an orthometric ratio $\\varsigma = 0.551^{+0.057}_{-0.054}$. We measure the change in projected semi-major axis $\\dot{x} = -202.1^{+2.5}_{-2.7} \\times10^{-16} \\, \\rm s\\,s^{-1}$ with high significance, parallax, $\\varpi$ = 1.11(6) mas, parallax derived distance 0.90(5) kpc, and a precise total proper motion magnitude of 12.432(2) mas yr$^{-1}$. A self-consistent analysis of all kinematic and relativistic effects, assuming general relativity, yields two solutions: (1) a pulsar mass $M_{\\rm p} = 1.39^{+0.38}_{-0.18}\\, \\rm M_{\\odot}$, a companion mass $M_{\\rm c} = 0.293^{+0.056}_{-0.026}$ $\\rm M_{\\odot}$, an orbital inclination, $i = 63(2)^{\\circ}$, and longitude of the ascending node, $\\Omega = 212(12)^{\\circ}$ or (2) a pulsar mass $M_{\\rm p} = 1.53^{+1.10}_{-0.22} \\, \\rm M_{\\odot}$, a companion mass $M_{\\rm c} = 0.309^{+0.163}_{-0.026}\\, \\rm M_{\\odot}$, an orbital inclination, $i = 123(4)^{\\circ}$, and longitude of the ascending node, $\\Omega = 334(12)^{\\circ}$. All uncertainties represent the 68.27$\\%$ credibility region. These results strongly favour a helium-dominated white dwarf companion.",
    "arxiv_id": "2601.08541",
    "authors": [
      "D. S. Pillay",
      "V. Venkatraman Krishnan",
      "David J. Champion",
      "P. C. C. Freire",
      "M. Kramer",
      "L. Guillemot",
      "M. Bailes",
      "A. Corongiu",
      "M. Geyer",
      "J. Singha",
      "R. M. Shannon",
      "G. Theureau",
      "I. Cognard",
      "M. J. Keith",
      "B. W. Stappers",
      "J. Antoniadis",
      "K. Liu",
      "G. M. Shaifullah"
    ],
    "categories": [
      "astro-ph.HE"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "Radio timing constraints on the orbital orientation and component masses of PSR J1455$-$3330",
    "url": "https://arxiv.org/abs/2601.08541",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2e03e7ea-e505-48df-b2cf-6c585db89ecf",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}