Dust stratification in young circumstellar disks

Terrence Rettig, Sean Brittain, Theodore Simon, Erika Gibb, Dinshaw S. Balsara, David A. Tilley, Craig Kulesa

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


We present high-resolution infrared spectra of four YSOs (T Tau N, T Tau S, RNO 91, and HL Tau). The spectra exhibit narrow absorption lines of 12CO, 13CO, and C18O, as well as broad emission lines of gas-phase 12CO. The narrow absorption lines of CO are shown to originate from the colder circumstellar gas. We find that the line-of-sight gas column densities resulting from the CO absorption lines are much higher than expected for the measured extinction for each source and suggest the gas/dust ratio is measuring the dust settling and/or grain coagulation in these extended disks. We provide a model of turbulence, dust settling, and grain growth to explain the results.

Original languageEnglish (US)
Pages (from-to)342-350
Number of pages9
JournalAstrophysical Journal
Issue numberI
StatePublished - Jul 20 2006


  • Circumstellar matter
  • Planetary systems: protoplanetary disks
  • Stars: formation
  • Stars: individual (HL Tau, RNO 91, T Tau S, T Tau N)
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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