The formation and evolution of planetary systems: Grain growth and chemical processing of dust in T tauri systems

J. Bouwman, Th Henning, L. A. Hillenbrand, M. R. Meyer, Ilaria Pascucci, J. Carpenter, D. Hines, J. S. Kim, M. D. Silverstone, D. Hollenbach, S. Wolf

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

This paper is one in a series presenting results obtained within the Formation and Evolution of Planetary Systems (FEPS) Legacy Science Program on the Spitzer Space Telescope. Here we present a study of dust processing and growth in seven protoplanetary disks. Our spectra indicate that the circumstellar silicate dust grains have grown to sizes at least 10 times larger than observed in the interstellar medium and show evidence for a non-negligible (∼5% in mass fractions) contribution from crystalline species. These results are similar to those of other studies of protoplanetary disks. In addition, we find a correlation between the strength of the amorphous silicate feature and the shape of the spectral energy distribution. This latter result is consistent with the growth and subsequent gravitational settling of dust grains toward the disk midplane. Furthermore, we find a change in the relative abundance of the different crystalline species: more enstatite than forsterite is observed in the inner warm dust population at ∼1 AU, while forsterite dominates in the colder outer regions at ∼5-15 AU. This change in the relative abundances argues for a localized crystallization process rather than a radial mixing scenario in which crystalline silicates are being transported outwards from a single formation region in the hot inner parts of the disk. Finally, we report the detection of emission from polycyclic aromatic hydrocarbon (PAH) molecules in five out of seven sources. We find a tentative PAH band at 8.2 μm that was previously undetected in the spectra of disks around low-mass pre-main-sequence stars.

Original languageEnglish (US)
Pages (from-to)479-498
Number of pages20
JournalAstrophysical Journal
Volume683
Issue number1
DOIs
StatePublished - Aug 10 2008

Fingerprint

planetary systems
dust
silicates
forsterite
protoplanetary disks
silicate
polycyclic aromatic hydrocarbons
relative abundance
PAH
enstatite
pre-main sequence stars
Space Infrared Telescope Facility
settling
spectral energy distribution
crystallization
chemical
energy
molecules

Keywords

  • Circumstellar matter
  • Planetary systems
  • Stars: Pre-main-sequence

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The formation and evolution of planetary systems : Grain growth and chemical processing of dust in T tauri systems. / Bouwman, J.; Henning, Th; Hillenbrand, L. A.; Meyer, M. R.; Pascucci, Ilaria; Carpenter, J.; Hines, D.; Kim, J. S.; Silverstone, M. D.; Hollenbach, D.; Wolf, S.

In: Astrophysical Journal, Vol. 683, No. 1, 10.08.2008, p. 479-498.

Research output: Contribution to journalArticle

Bouwman, J, Henning, T, Hillenbrand, LA, Meyer, MR, Pascucci, I, Carpenter, J, Hines, D, Kim, JS, Silverstone, MD, Hollenbach, D & Wolf, S 2008, 'The formation and evolution of planetary systems: Grain growth and chemical processing of dust in T tauri systems', Astrophysical Journal, vol. 683, no. 1, pp. 479-498. https://doi.org/10.1086/587793
Bouwman, J. ; Henning, Th ; Hillenbrand, L. A. ; Meyer, M. R. ; Pascucci, Ilaria ; Carpenter, J. ; Hines, D. ; Kim, J. S. ; Silverstone, M. D. ; Hollenbach, D. ; Wolf, S. / The formation and evolution of planetary systems : Grain growth and chemical processing of dust in T tauri systems. In: Astrophysical Journal. 2008 ; Vol. 683, No. 1. pp. 479-498.
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