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29 March 2024
 
  » arxiv » 1108.4678

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The Discovery of Y Dwarfs Using Data from the Wide-field Infrared Survey Explorer (WISE)
Michael C. Cushing ; J. Davy Kirkpatrick ; Christopher R. Gelino ; Roger L. Griffith ; Michael F. Skrutskie ; Amanda K. Mainzer ; Kenneth A. Marsh ; Charles A. Beichman ; Adam J. Burgasser ; Lisa A. Prato ; Robert A. Simcoe ; Mark S. Marley ; D. Saumon ; Richard S. Freedman ; Peter R. Eisenhardt ; Edward L. Wright ;
Date 23 Aug 2011
AbstractWe present the discovery of seven ultracool brown dwarfs identified with the Wide-field Infrared Survey Explorer (WISE). Near-infrared spectroscopy reveals deep absorption bands of H_2O and CH_4 that indicate all seven of the brown dwarfs have spectral types later than UGPS J072227.51-054031.2, the latest type T dwarf currently known. The spectrum of WISEP J182831.08+265037.8 is distinct in that the heights of the J- and H-band peaks are approximately equal in units of f_lambda, so we identify it as the archetypal member of the Y spectral class. The spectra of at least two of the other brown dwarfs exhibit absorption on the blue wing of the H-band peak that we tentatively ascribe to NH_3. These spectral morphological changes provide a clear transition between the T dwarfs and the Y dwarfs. In order to produce a smooth near-infrared spectral sequence across the T/Y dwarf transition, we have reclassified UGPS J0722-0540 as the T9 spectral standard and tentatively assign WISEP J173835.52+273258.9 as the Y0 spectral standard. In total, six of the seven new brown dwarfs are classified as Y dwarfs: four are classified as Y0, one is classified as Y0 (pec?), and WISEP J1828+2650 is classified as >Y0. We have also compared the spectra to the model atmospheres of Marley and Saumon and infer that the brown dwarfs have effective temperatures ranging from 300 K to 500 K, making them the coldest spectroscopically confirmed brown dwarfs known to date.
Source arXiv, 1108.4678
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