Browsing University of Hertfordshire by Author "Deacon, Niall R."

Now showing items 1-3 of 3

    • Deep z-band observations of the coolest y dwarf 

      Kopytova, Taisiya G.; Crossfield, Ian J M; Deacon, Niall R.; Brandner, Wolfgang; Buenzli, Esther; Bayo, Amelia; Schlieder, Joshua E.; Manjavacas, Elena; Biller, Beth A.; Kopon, Derek (2014-11-17)
      WISE J085510.83-071442.5 (hereafter, WISE 0855-07) is the coolest Y dwarf known to date and is located at a distance of 2.31 ± 0.08 pc, giving it the fourth largest parallax of any known star or brown dwarf system. We ...

    • On the binary frequency of the lowest mass members of the pleiades with hubble space telescope wide field camera 3 

      Garcia, E. V.; Dupuy, Trent J.; Allers, Katelyn N.; Liu, Michael C.; Deacon, Niall R. (2015-05-01)
      We present the results of a Hubble Space Telescope Wide Field Camera 3 (WFC3) imaging survey of 11 of the lowest mass brown dwarfs in the Pleiades known (25-40 MJup). These objects represent the predecessors to T dwarfs ...

    • Prospecting in ultracool dwarfs : Measuring the metallicities of mid- and late-m dwarfs 

      Mann, Andrew W.; Deacon, Niall R.; Gaidos, Eric; Ansdell, Megan; Brewer, John M.; Liu, Michael C.; Magnier, Eugene A.; Aller, Kimberly M. (2014-05-14)
      Metallicity is a fundamental parameter that contributes to the physical characteristics of a star. The low temperatures and complex molecules present in M dwarf atmospheres make it difficult to measure their metallicities ...