{
  "id": "1904.10002",
  "version": "v1",
  "published": "2019-04-22T18:00:09.000Z",
  "updated": "2019-04-22T18:00:09.000Z",
  "title": "Constraints on the Neutron Star Equation of State from GW170817",
  "authors": [
    "Carolyn A. Raithel"
  ],
  "comment": "Invited contribution to the EPJA topical issue \"The first neutron star merger observation - Implications for nuclear physics\"",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The first detection of gravitational waves from a neutron star-neutron star merger, GW170817, has opened up a new avenue for constraining the ultradense-matter equation of state (EOS). The deviation of the observed waveform from a point-particle waveform is a sensitive probe of the EOS controlling the merging neutron stars' structure. In this topical review, I discuss the various constraints that have been made on the EOS in the year following the discovery of GW170817. In particular, I review the surprising relationship that has emerged between the effective tidal deformability of the binary system and the neutron star radius. I also report new results that make use of this relationship, finding that the radius inferred from GW170817 lies between 9.8 and 13.2 km at 90% confidence, with distinct likelihood peaks at 10.8 and 12.3 km. I compare these radii, as well as those inferred in the literature, to X-ray measurements of the neutron star radius. I also summarize the various maximum mass constraints, which point towards a maximum mass < 2.3 M_sun, depending on the fate of the remnant, and which can be used to additionally constrain the high-density EOS. I review the constraints on the EOS that have been performed directly, through Bayesian inference schemes. Finally, I comment on the importance of disentangling thermal effects in future EOS constraints from neutron star mergers.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-04-22T18:00:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "neutron star equation",
      "neutron star radius",
      "neutron star-neutron star merger",
      "distinct likelihood peaks",
      "bayesian inference schemes"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}