Dust stratification in young circumstellar disks

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

doi:10.1086/504703

Dust stratification in young circumstellar disks

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

Steward Observatory

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

27 Scopus citations

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 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 language	English (US)
Pages (from-to)	342-350
Number of pages	9
Journal	Astrophysical Journal
Volume	646
Issue number	I
DOIs	https://doi.org/10.1086/504703
State	Published - Jul 20 2006

Keywords

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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10.1086/504703

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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 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.",

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

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

year = "2006",

month = jul,

day = "20",

doi = "10.1086/504703",

language = "English (US)",

volume = "646",

pages = "342--350",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "I",

}

TY - JOUR

T1 - Dust stratification in young circumstellar disks

AU - Rettig, Terrence

AU - Brittain, Sean

AU - Simon, Theodore

AU - Gibb, Erika

AU - Balsara, Dinshaw S.

AU - Tilley, David A.

AU - Kulesa, Craig

PY - 2006/7/20

Y1 - 2006/7/20

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 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.

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 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.

KW - Circumstellar matter

KW - Planetary systems: protoplanetary disks

KW - Stars: formation

KW - Stars: individual (HL Tau, RNO 91, T Tau S, T Tau N)

KW - Stars: pre-main-sequence

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U2 - 10.1086/504703

DO - 10.1086/504703

M3 - Article

AN - SCOPUS:33747454958

SN - 0004-637X

VL - 646

SP - 342

EP - 350

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - I

ER -

Dust stratification in young circumstellar disks

Abstract

Keywords

ASJC Scopus subject areas

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