{
  "id": "1409.5899",
  "version": "v1",
  "published": "2014-09-20T15:29:45.000Z",
  "updated": "2014-09-20T15:29:45.000Z",
  "title": "A New Parallax Measurement for the Coldest Known Brown Dwarf",
  "authors": [
    "K. L. Luhman",
    "T. L. Esplin"
  ],
  "comment": "Astrophysical Journal, in press",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "WISE J085510.83-071442.5 was recently discovered as the coldest known brown dwarf based on four epochs of images from the Wide-field Infrared Survey Explorer and the Spitzer Space Telescope. We have improved the accuracy of its parallax measurement by obtaining two additional epochs of Spitzer astrometry. We derive a parallactic distance of 2.31+/-0.08 pc, which continues to support its rank as the fourth closest known system to the Sun when compared to WISE J104915.57-531906.1 AB (2.02+/-0.02 pc) and Wolf 359 (2.386+/-0.012 pc). The new constraint on the absolute magnitude at 4.5um indicates an effective temperature of 235-260 K based on four sets of theoretical models. We also show the updated positions of WISE J085510.83-071442.5 in two color-magnitude diagrams. Whereas Faherty and coworkers cited its location in MW2 versus J-W2 as evidence of water clouds, we find that those data can be explained instead by cloudless models that employ non-equilibrium chemistry.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-09-20T15:29:45.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "brown dwarf",
      "parallax measurement",
      "employ non-equilibrium chemistry",
      "spitzer space telescope",
      "wide-field infrared survey explorer"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/796/1/6",
      "journal": "The Astrophysical Journal",
      "year": 2014,
      "month": "Nov",
      "volume": 796,
      "number": 1,
      "pages": 6
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014ApJ...796....6L"
    }
  }
}