Seventy-one new L and T dwarfs from the sloan digital sky survey

K. Chiu, X. Fan, S. K. Leggett, D. A. Golimowski, W. Zheng, T. R. Geballe, D. P. Schneider, J. Brinkmann

Research output: Contribution to journalReview article

196 Scopus citations

Abstract

We present near-infrared observations of 71 newly discovered L and T dwarfs, selected from imaging data of the Sloan Digital Sky Survey (SDSS) using the i-dropout technique. Sixty-five of these dwarfs have been classified spectroscopically according to the near-infrared L dwarf classification scheme of Geballe et al. and the unified T dwarf classification scheme of Burgasser et al. The spectral types of these dwarfs range from L3 to T7 and include the latest types yet found in the SDSS. Six of the newly identified dwarfs are classified as early to mid-L dwarfs according to their photometric near-infrared colors, and two others are classified photometrically as M dwarfs. We also present new near-infrared spectra for five previously published SDSS L and T dwarfs, and one L dwarf and one T dwarf discovered by Burgasser et al. from the Two Micron All Sky Survey. The new SDSS sample includes 27 T dwarfs and 30 dwarfs with spectral types spanning the complex L-T transition (L7-T3). We continue to see a large (∼0.5 mag) spread in J - H for L3-T1 types and a similar spread in H - K for all dwarfs later than L3. This color dispersion is probably due to a range of grain sedimentation properties, metallicity, and gravity. We also find L and T dwarfs with unusual colors and spectral properties that may eventually help to disentangle these effects.

Original languageEnglish (US)
Pages (from-to)2722-2736
Number of pages15
JournalAstronomical Journal
Volume131
Issue number5
DOIs
StatePublished - May 1 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Seventy-one new L and T dwarfs from the sloan digital sky survey'. Together they form a unique fingerprint.

  • Cite this

    Chiu, K., Fan, X., Leggett, S. K., Golimowski, D. A., Zheng, W., Geballe, T. R., Schneider, D. P., & Brinkmann, J. (2006). Seventy-one new L and T dwarfs from the sloan digital sky survey. Astronomical Journal, 131(5), 2722-2736. https://doi.org/10.1086/501431