Mid-infrared spectra of Class I protostars in Taurus

Dan M. Watson; F. Kemper; Nuria Calvet; Luke D. Keller; Elise Furlan; Lee Hartmann; W. J. Forrest; C. H. Chen; Keven I. Uchida; Joel D. Green; B. Sargent; G. C. Sloan; Terry L. Herter; Bernhard R. Brandl; J. R. Houck; J. Najita; Paola D'Alessio; P. C. Myers; D. J. Barry; P. Hall; P. W. Morris

doi:10.1086/422918

Mid-infrared spectra of Class I protostars in Taurus

Dan M. Watson, F. Kemper, Nuria Calvet, Luke D. Keller, Elise Furlan, Lee Hartmann, W. J. Forrest, C. H. Chen, Keven I. Uchida, Joel D. Green, B. Sargent, G. C. Sloan, Terry L. Herter, Bernhard R. Brandl, J. R. Houck, J. Najita, Paola D'Alessio, P. C. Myers, D. J. Barry, P. HallP. W. Morris

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

Abstract

We present Spitzer Space Telescope Infrared Spectrograph observations in the 5.3-20 μm range of five young stellar objects in Taurus that have Class I continuum spectral energy distributions (λF λαλn, n ≥ 0), often taken to represent the youngest stellar objects in this star formation region. The spectra include a rich collection of broad absorption features that we identify with amorphous silicates and various ices, notably those of carbon dioxide and water. We show that the absorption features are produced mainly in the envelopes of these systems. The apparent depths of silicate and 15.2 μm CO2 ice features vary among the objects in a manner that is consistent with a variation of inclination with respect to the line of sight, contribution to the silicate features from material throughout the envelopes, and an origin for the CO2 ice feature in the outer parts of the envelope. Thus, these features provide new and useful constraints on models of the physical structure of Class I protostars.

Original language	English
Pages (from-to)	391-395
Number of pages	4
Journal	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume	154
Issue number	1
DOIs	https://doi.org/10.1086/422918
Publication status	Published - Sept 2004

Keywords

Accretion, accretion disks
Circumstellar matter
Infrared: Stars
Stars: Formation
Stars: Pre-main-sequence

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10.1086/422918

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Watson, D. M., Kemper, F., Calvet, N., Keller, L. D., Furlan, E., Hartmann, L., Forrest, W. J., Chen, C. H., Uchida, K. I., Green, J. D., Sargent, B., Sloan, G. C., Herter, T. L., Brandl, B. R., Houck, J. R., Najita, J., D'Alessio, P., Myers, P. C., Barry, D. J., ... Morris, P. W. (2004). Mid-infrared spectra of Class I protostars in Taurus. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 154(1), 391-395. https://doi.org/10.1086/422918

@article{392354040ff4418c850e3e5e3d7e0762,

title = "Mid-infrared spectra of Class I protostars in Taurus",

abstract = "We present Spitzer Space Telescope Infrared Spectrograph observations in the 5.3-20 μm range of five young stellar objects in Taurus that have Class I continuum spectral energy distributions (λF λαλn, n ≥ 0), often taken to represent the youngest stellar objects in this star formation region. The spectra include a rich collection of broad absorption features that we identify with amorphous silicates and various ices, notably those of carbon dioxide and water. We show that the absorption features are produced mainly in the envelopes of these systems. The apparent depths of silicate and 15.2 μm CO2 ice features vary among the objects in a manner that is consistent with a variation of inclination with respect to the line of sight, contribution to the silicate features from material throughout the envelopes, and an origin for the CO2 ice feature in the outer parts of the envelope. Thus, these features provide new and useful constraints on models of the physical structure of Class I protostars.",

keywords = "Accretion, accretion disks, Circumstellar matter, Infrared: Stars, Stars: Formation, Stars: Pre-main-sequence",

author = "Watson, {Dan M.} and F. Kemper and Nuria Calvet and Keller, {Luke D.} and Elise Furlan and Lee Hartmann and Forrest, {W. J.} and Chen, {C. H.} and Uchida, {Keven I.} and Green, {Joel D.} and B. Sargent and Sloan, {G. C.} and Herter, {Terry L.} and Brandl, {Bernhard R.} and Houck, {J. R.} and J. Najita and Paola D'Alessio and Myers, {P. C.} and Barry, {D. J.} and P. Hall and Morris, {P. W.}",

year = "2004",

month = sep,

doi = "10.1086/422918",

language = "English",

volume = "154",

pages = "391--395",

journal = "ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES",

issn = "0067-0049",

publisher = "IOP Publishing Ltd",

number = "1",

}

Watson, DM, Kemper, F, Calvet, N, Keller, LD, Furlan, E, Hartmann, L, Forrest, WJ, Chen, CH, Uchida, KI, Green, JD, Sargent, B, Sloan, GC, Herter, TL, Brandl, BR, Houck, JR, Najita, J, D'Alessio, P, Myers, PC, Barry, DJ, Hall, P & Morris, PW 2004, 'Mid-infrared spectra of Class I protostars in Taurus', ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, vol. 154, no. 1, pp. 391-395. https://doi.org/10.1086/422918

TY - JOUR

T1 - Mid-infrared spectra of Class I protostars in Taurus

AU - Watson, Dan M.

AU - Kemper, F.

AU - Calvet, Nuria

AU - Keller, Luke D.

AU - Furlan, Elise

AU - Hartmann, Lee

AU - Forrest, W. J.

AU - Chen, C. H.

AU - Uchida, Keven I.

AU - Green, Joel D.

AU - Sargent, B.

AU - Sloan, G. C.

AU - Herter, Terry L.

AU - Brandl, Bernhard R.

AU - Houck, J. R.

AU - Najita, J.

AU - D'Alessio, Paola

AU - Myers, P. C.

AU - Barry, D. J.

AU - Hall, P.

AU - Morris, P. W.

PY - 2004/9

Y1 - 2004/9

N2 - We present Spitzer Space Telescope Infrared Spectrograph observations in the 5.3-20 μm range of five young stellar objects in Taurus that have Class I continuum spectral energy distributions (λF λαλn, n ≥ 0), often taken to represent the youngest stellar objects in this star formation region. The spectra include a rich collection of broad absorption features that we identify with amorphous silicates and various ices, notably those of carbon dioxide and water. We show that the absorption features are produced mainly in the envelopes of these systems. The apparent depths of silicate and 15.2 μm CO2 ice features vary among the objects in a manner that is consistent with a variation of inclination with respect to the line of sight, contribution to the silicate features from material throughout the envelopes, and an origin for the CO2 ice feature in the outer parts of the envelope. Thus, these features provide new and useful constraints on models of the physical structure of Class I protostars.

AB - We present Spitzer Space Telescope Infrared Spectrograph observations in the 5.3-20 μm range of five young stellar objects in Taurus that have Class I continuum spectral energy distributions (λF λαλn, n ≥ 0), often taken to represent the youngest stellar objects in this star formation region. The spectra include a rich collection of broad absorption features that we identify with amorphous silicates and various ices, notably those of carbon dioxide and water. We show that the absorption features are produced mainly in the envelopes of these systems. The apparent depths of silicate and 15.2 μm CO2 ice features vary among the objects in a manner that is consistent with a variation of inclination with respect to the line of sight, contribution to the silicate features from material throughout the envelopes, and an origin for the CO2 ice feature in the outer parts of the envelope. Thus, these features provide new and useful constraints on models of the physical structure of Class I protostars.

KW - Accretion, accretion disks

KW - Circumstellar matter

KW - Infrared: Stars

KW - Stars: Formation

KW - Stars: Pre-main-sequence

U2 - 10.1086/422918

DO - 10.1086/422918

M3 - Article

SN - 0067-0049

VL - 154

SP - 391

EP - 395

JO - ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES

JF - ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES

IS - 1

ER -

Mid-infrared spectra of Class I protostars in Taurus

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Keywords

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