{
  "id": "2207.14802",
  "version": "v1",
  "published": "2022-07-29T17:31:15.000Z",
  "updated": "2022-07-29T17:31:15.000Z",
  "title": "Early results from GLASS-JWST. XIII. A faint, distant, and cold brown dwarf",
  "authors": [
    "M. Nonino",
    "K. Glazebrook",
    "A. J. Burgasser",
    "G. Polenta",
    "T. Morishita",
    "M. Lepinzan",
    "M. Castellano",
    "A. Fontana",
    "E. Merlin",
    "A. Bonchi",
    "D. Paris",
    "T. Treu",
    "B. Vulcani",
    "X. Wang",
    "P. Santini",
    "E. Vanzella",
    "T. Nanayakkara",
    "A. Mercurio",
    "P. Rosati",
    "C. Grillo",
    "M. Bradac"
  ],
  "comment": "Submitted to ApJL",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4~$\\mu$m wavelengths and the panchromatic 0.9--4.5~$\\mu$m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95$\\pm$0.15 and F444W = 25.84$\\pm$0.01 (AB), and its F115W$-$F444W and F356W$-$F444W colors match those expected for other, known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of $T_{eff}$ $\\approx$ 600~K and surface gravity $\\log{g}$ $\\approx$ 5, implying a mass of 0.03~M$_{\\odot}$ and age of 5~Gyr. We estimate the distance of this candidate to be 570--720~pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-07-29T17:31:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cold brown dwarf",
      "early results",
      "late t-type brown dwarf candidate",
      "thick disk",
      "glass-jwst"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}