{
  "id": "1803.05095",
  "version": "v1",
  "published": "2018-03-14T01:36:29.000Z",
  "updated": "2018-03-14T01:36:29.000Z",
  "title": "OGLE-2017-BLG-1522: A giant planet around a brown dwarf located in the Galactic bulge",
  "authors": [
    "Y. K. Jung",
    "A. Udalski",
    "A. Gould",
    "Y. -H. Ryu",
    "J. C. Yee",
    "C. Han",
    "M. D. Albrow",
    "C. -U. Lee",
    "S. -L. Kim",
    "K. -H. Hwang",
    "S. -J. Chung",
    "I. -G. Shin",
    "W. Zhu",
    "S. -M. Cha",
    "D. -J. Kim",
    "Y. Lee",
    "B. -G. Park",
    "D. -J. Lee",
    "H. -W. Kim",
    "R. W. Pogge",
    "M. K. Szymański",
    "P. Mróz",
    "R. Poleski",
    "J. Skowron",
    "P. Pietrukowicz",
    "I. Soszyński",
    "S. Kozłowski",
    "K. Ulaczyk",
    "M. Pawlak",
    "K. Rybicki"
  ],
  "comment": "20 pages, 6 figures",
  "categories": [
    "astro-ph.EP",
    "astro-ph.SR"
  ],
  "abstract": "We report the discovery of a giant planet in the OGLE-2017-BLG-1522 microlensing event. The planetary perturbations were clearly identified by high-cadence survey experiments despite the relatively short event timescale of $t_{\\rm E} \\sim 7.5$ days. The Einstein radius is unusually small, $\\theta_{\\rm E} = 0.065\\,$mas, implying that the lens system either has very low mass or lies much closer to the microlensed source than the Sun, or both. A Bayesian analysis yields component masses $(M_{\\rm host}, M_{\\rm planet})=(46_{-25}^{+79}, 0.75_{-0.40}^{+1.26})~M_{\\rm J}$ and source-lens distance $D_{\\rm LS} = 0.99_{-0.54}^{+0.91}~{\\rm kpc}$, implying that this is a brown-dwarf/Jupiter system that probably lies in the Galactic bulge, a location that is also consistent with the relatively low lens-source relative proper motion $\\mu = 3.2 \\pm 0.5~{\\rm mas}~{\\rm yr^{-1}}$. The projected companion-host separation is $0.59_{-0.11}^{+0.12}~{\\rm AU}$, indicating that the planet is placed beyond the snow line of the host, i.e., $a_{sl} \\sim 0.12~{\\rm AU}$. Planet formation scenarios combined with the small companion-host mass ratio $q \\sim 0.016$ and separation suggest that the companion could be the first discovery of a giant planet that formed in a protoplanetary disk around a brown dwarf host.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-03-14T01:36:29.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "giant planet",
      "galactic bulge",
      "brown dwarf",
      "lens-source relative proper motion",
      "low lens-source relative proper"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}