Dust Stratification in Young Circumstellar Disks

Terrence W Rettig; Sean D Brittain; Theodore Simon; Erika Gibb; Dinshaw S Balsara; David A Tilley; Craig Kulesa

doi:10.1086/504703

Dust Stratification in Young Circumstellar Disks

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

University of Missouri-St. Louis

Research output: Contribution to journal › Article › peer-review

Abstract

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 12 CO, 13 CO, and C 18 O, as well as broad emission lines of gas-phase 12 CO. 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 language	American English
Journal	The Astrophysical Journal
Volume	646
DOIs	https://doi.org/10.1086/504703
State	Published - Jul 2006

Disciplines

Physical Sciences and Mathematics

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Cite this

@article{c510d5612bba4eccaa16780e76fd9f2f,

title = "Dust Stratification in Young Circumstellar Disks",

abstract = " 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 12 CO, 13 CO, and C 18 O, as well as broad emission lines of gas-phase 12 CO. 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. ",

author = "Rettig, {Terrence W} and Brittain, {Sean D} and Theodore Simon and Erika Gibb and Balsara, {Dinshaw S} and Tilley, {David A} and Craig Kulesa",

year = "2006",

month = jul,

doi = "10.1086/504703",

language = "American English",

volume = "646",

journal = "The Astrophysical Journal",

}

TY - JOUR

T1 - Dust Stratification in Young Circumstellar Disks

AU - Rettig, Terrence W

AU - Brittain, Sean D

AU - Simon, Theodore

AU - Gibb, Erika

AU - Balsara, Dinshaw S

AU - Tilley, David A

AU - Kulesa, Craig

PY - 2006/7

Y1 - 2006/7

N2 - 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 12 CO, 13 CO, and C 18 O, as well as broad emission lines of gas-phase 12 CO. 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.

AB - 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 12 CO, 13 CO, and C 18 O, as well as broad emission lines of gas-phase 12 CO. 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.

U2 - 10.1086/504703

DO - 10.1086/504703

M3 - Article

VL - 646

JO - The Astrophysical Journal

JF - The Astrophysical Journal

ER -