The evolutionary state of the pre-main sequence population in ophiuchus

A large infrared spectrograph survey

M. K. McClure, E. Furlan, P. Manoj, Kevin Luhman, D. M. Watson, W. J. Forrest, C. Espaillat, N. Calvet, P. D'Alessio, B. Sargent, J. J. Tobin, Hsin Fang Chiang

Research output: Contribution to journalArticle

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Abstract

Variations in molecular cloud environments have the potential to affect the composition and structure of the circumstellar disks therein. To this end, comparative analyses of nearby star-forming regions are essential to informing theoretical work. In particular, the Ophiuchus molecular clouds are ideal for comparison as they are more compact with much higher extinction than Taurus, the low-mass exemplar, and experience a moderate amount of external radiation. We have carried out a study of a collection of 136 young stellar objects in the <1 Myr old Ophiuchus star-forming region, featuring Spitzer Infrared Spectrograph spectra from 5 to 36 μm, supplemented with photometry from 0.3 μm to 1.3 mm. By classifying these objects using the McClure new molecular cloud extinction law to establish an extinction-independent index, we arrive at a ∼ 10% embedded objects fraction, producing an embedded lifetime of 0.2 Myr, similar to that in Taurus. We analyze the degree of dust sedimentation and dust grain processing in the disks, finding that the disks are highly settled with signs of significant dust processing even at ∼ 0.3 Myr. Finally, we discuss the wealth of evidence for radial gap structures which could be evidence for disk-planet interactions and explore the effects of stellar multiplicity on the degree of settling and radial structure.

Original languageEnglish (US)
Pages (from-to)75-122
Number of pages48
JournalAstrophysical Journal, Supplement Series
Volume188
Issue number1
DOIs
StatePublished - Jun 2 2010

Fingerprint

spectrographs
extinction
molecular clouds
dust
stars
settling
planet
classifying
sedimentation
photometry
planets
life (durability)
radiation
interactions
comparison
index
effect
young

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

McClure, M. K. ; Furlan, E. ; Manoj, P. ; Luhman, Kevin ; Watson, D. M. ; Forrest, W. J. ; Espaillat, C. ; Calvet, N. ; D'Alessio, P. ; Sargent, B. ; Tobin, J. J. ; Chiang, Hsin Fang. / The evolutionary state of the pre-main sequence population in ophiuchus : A large infrared spectrograph survey. In: Astrophysical Journal, Supplement Series. 2010 ; Vol. 188, No. 1. pp. 75-122.
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McClure, MK, Furlan, E, Manoj, P, Luhman, K, Watson, DM, Forrest, WJ, Espaillat, C, Calvet, N, D'Alessio, P, Sargent, B, Tobin, JJ & Chiang, HF 2010, 'The evolutionary state of the pre-main sequence population in ophiuchus: A large infrared spectrograph survey', Astrophysical Journal, Supplement Series, vol. 188, no. 1, pp. 75-122. https://doi.org/10.1088/0067-0049/188/1/75

The evolutionary state of the pre-main sequence population in ophiuchus : A large infrared spectrograph survey. / McClure, M. K.; Furlan, E.; Manoj, P.; Luhman, Kevin; Watson, D. M.; Forrest, W. J.; Espaillat, C.; Calvet, N.; D'Alessio, P.; Sargent, B.; Tobin, J. J.; Chiang, Hsin Fang.

In: Astrophysical Journal, Supplement Series, Vol. 188, No. 1, 02.06.2010, p. 75-122.

Research output: Contribution to journalArticle

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AU - Luhman, Kevin

AU - Watson, D. M.

AU - Forrest, W. J.

AU - Espaillat, C.

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AU - D'Alessio, P.

AU - Sargent, B.

AU - Tobin, J. J.

AU - Chiang, Hsin Fang

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