Indications for grain growth and mass decrease in cold dust disks around classical T Tauri stars in the MBM 12 young association

Michiel R. Hogerheijde, Doug Johnstone, Isamu M Matsuyama, Ray Jayawardhana, James Muzerolle

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We report the detection of continuum emission at λ = 850 and 450 μm from disks around four classical T Tauri stars in the MBM 12 (L1457) young association. Using a simple model, we infer masses of 0.0014-0.012 M for the disk of LkHα 263 ABC, 0.005-0.021 M for S18 ABab, 0.03-0.18 M for LkHα 264 A, and 0.023-0.23 M for LkHα 262. The disk mass found for LkHα 263 ABC is consistent with the 0.0018 M inferred from the scattered-light image of the edge-on disk around component C. Comparison to earlier 13CO line observations indicates CO depletion by up to a factor of 300 with respect to dark-cloud values. The spectral energy distributions (SEDs) suggest grain growth, possibly to sizes of a few hundred microns, but our spatially unresolved data cannot rule out opacity as an explanation for the SED shape. Our observations show that these T Tauri stars are still surrounded by significant reservoirs of cold material at an age of 1-5 Myr. We conclude that the observed differences in disk mass are likely explained by binary separation affecting the initial value. With available accretion rate estimates we find that our data are consistent with theoretical expectations for viscously evolving disks having decreased their masses by ∼30%.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume593
Issue number2 II
DOIs
StatePublished - Aug 20 2003
Externally publishedYes

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T Tauri stars
indication
dust
spectral energy distribution
energy
accretion
opacity
cold
young
depletion
continuums
estimates
distribution

Keywords

  • Circumstellar matter
  • ISM: clouds
  • ISM: individual (MBM 12)
  • Stars: formation
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Indications for grain growth and mass decrease in cold dust disks around classical T Tauri stars in the MBM 12 young association. / Hogerheijde, Michiel R.; Johnstone, Doug; Matsuyama, Isamu M; Jayawardhana, Ray; Muzerolle, James.

In: Astrophysical Journal, Vol. 593, No. 2 II, 20.08.2003.

Research output: Contribution to journalArticle

Hogerheijde, Michiel R. ; Johnstone, Doug ; Matsuyama, Isamu M ; Jayawardhana, Ray ; Muzerolle, James. / Indications for grain growth and mass decrease in cold dust disks around classical T Tauri stars in the MBM 12 young association. In: Astrophysical Journal. 2003 ; Vol. 593, No. 2 II.
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N2 - We report the detection of continuum emission at λ = 850 and 450 μm from disks around four classical T Tauri stars in the MBM 12 (L1457) young association. Using a simple model, we infer masses of 0.0014-0.012 M ⊙ for the disk of LkHα 263 ABC, 0.005-0.021 M ⊙ for S18 ABab, 0.03-0.18 M⊙ for LkHα 264 A, and 0.023-0.23 M⊙ for LkHα 262. The disk mass found for LkHα 263 ABC is consistent with the 0.0018 M⊙ inferred from the scattered-light image of the edge-on disk around component C. Comparison to earlier 13CO line observations indicates CO depletion by up to a factor of 300 with respect to dark-cloud values. The spectral energy distributions (SEDs) suggest grain growth, possibly to sizes of a few hundred microns, but our spatially unresolved data cannot rule out opacity as an explanation for the SED shape. Our observations show that these T Tauri stars are still surrounded by significant reservoirs of cold material at an age of 1-5 Myr. We conclude that the observed differences in disk mass are likely explained by binary separation affecting the initial value. With available accretion rate estimates we find that our data are consistent with theoretical expectations for viscously evolving disks having decreased their masses by ∼30%.

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