Browsing Research publications by Author "Gizis, John E."

Now showing items 1-9 of 9

    • BROWN DWARF DISKS AT AGES OF 5-10 Myr 

      Riaz, Basmah; Lodieu, Nicolas; Gizis, John E. (2009-11-10)
      We present Spitzer/IRAC and MIPS 24 mu m observations for 28 brown dwarfs in the Upper Scorpius (UppSco) region. We find a disk fraction of 10.7%-(+ 8.7%)(3.3%) . One object shows a small excess at 24 mu m but none at ...

    • Characterizing the disk around the TW Hydrae Association brown dwarf 2MASSW J1207334-393254 

      Riaz, Basmah; Gizis, John E. (2007-05-20)
      We present detailed modeling of the disk around the TW Hydrae Association (TWA) brown dwarf 2MASSW J1207334 - 393254 (2M1207), using Spitzer observations from 3.6 to 24 mu m. The spectral energy distribution (SED) does not ...

    • Erratum: "Identification of New M Dwarfs in the Solar Neighborhood" (AJ, 132, 866 [2006]) 

      Riaz, Basmah; Gizis, John E.; Harvin, James (2007-03)

    • Hubble Space Telescope search for M subdwarf binaries 

      Riaz, Basmah; Gizis, John E.; Samaddar, Debasmita (2008-01-10)
      We present HSTACS observations of 19 nearby M subdwarfs in a search for binary systems. Other than the wide common proper-motion pair LHS 2140/2139, none of our sdM and esdM targets are found to be binaries. Our survey is ...

    • Identification of new M dwarfs in the solar neighborhood 

      Riaz, Basmah; Gizis, John E.; Harvin, James (2006-08)
      We present the results from a spectroscopic study of 1080 nearby active M dwarfs, selected by correlating the Two Micron All Sky Survey and ROSAT catalogs. We have derived the spectral types and estimated distances for all ...

    • Infrared Observations of a Mid-L Dwarf with Strong Hα Emission 

      Riaz, Basmah; Gizis, John E. (2007-04-10)
      We present Spitzer/IRAC observations of the L5 dwarf, 2MASSI J1315309-264951 (2M 1315). This ultracool dwarf is known to display strong emission in the H alpha line. The spectral energy distribution (SED) for this object ...

    • New brown dwarf disks in the TW Hydrae association 

      Riaz, Basmah; Gizis, John E. (2008-07-10)
      In our analysis of Spitzer IRS archival data on the stellar and substellar members of the TW Hydrae association (TWA), we have discovered two new brown dwarf disks: a flat, optically thick disk around SSSPM J1102 - 3431 ...

    • Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: A Pioneering Process of Community-focused Experimental Design 

      Bianco, Federica B.; Ivezić, Željko; Jones, R. Lynne; Graham, Melissa L.; Marshall, Phil; Saha, Abhijit; Strauss, Michael A.; Yoachim, Peter; Ribeiro, Tiago; Anguita, Timo; Bauer, A. E.; Bauer, Franz E.; Bellm, Eric C.; Blum, Robert D.; Brandt, William N.; Brough, Sarah; Catelan, Márcio; Clarkson, William I.; Connolly, Andrew J.; Gawiser, Eric; Gizis, John E.; Hložek, Renée; Kaviraj, Sugata; Liu, Charles T.; Lochner, Michelle; Mahabal, Ashish A.; Mandelbaum, Rachel; McGehee, Peregrine; Neilsen Jr., Eric H.; Olsen, Knut A. G.; Peiris, Hiranya V.; Rhodes, Jason; Richards, Gordon T.; Ridgway, Stephen; Schwamb, Megan E.; Scolnic, Dan; Shemmer, Ohad; Slater, Colin T.; Slosar, Anže; Smartt, Stephen J.; Strader, Jay; Street, Rachel; Trilling, David E.; Verma, Aprajita; Vivas, A. K.; Wechsler, Risa H.; Willman, Beth (2021-12-22)
      Vera C. Rubin Observatory is a ground-based astronomical facility under construction, a joint project of the National Science Foundation and the U.S. Department of Energy, designed to conduct a multipurpose 10 yr optical ...

    • Spitzer observations of nearby M dwarfs 

      Riaz, Basmah; Mullan, D. J.; Gizis, John E. (2006-10-20)
      We present Spitzer IRAC and MIPS observations for a sample of eight M dwarfs: six dMe, one dM, and one sdMe star. All of our targets are found to have SEDs that are fitted within the error bars by a purely photospheric ...