Aperture synthesis imaging of the circumstellar dust disk around DO tauri

David W Koerner, C. J. Chandler, A. I. Sargent

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We have detected the T Tauri star, DO Tauri, in a 0″.6 resolution VLA map of 43.3 GHz (λ = 7 mm) continuum emission. The 43 GHz flux density lies on the same power-law slope defined by 89-232 GHz measurements, Fv ∝ vα with index α = 2.39 ± 0.23, confirming that the 43.3 GHz emission is thermal radiation from circumstellar dust. Upper limits to the flux densities at 8.4 and 22.5 GHz constrain the contribution of free-free emission from a compact ionized wind to be less than 49%. The dust emissivity index, β, is 0.39 ± 0.23 if the emission is optically thin. Fitting a model of a thin circumstellar disk to the observed spectral energy distribution gives β = 0.6 ± 0.3, consistent with the power-law derivation. Both values are substantially lower than is generally accepted for the interstellar medium, suggesting grain growth. Given the youth of DO Tau and the early evolutionary state of its circumstellar disk, this result implies that millimeter-size grains have already formed by the early T Tauri phase.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume452
Issue number1 PART 2
StatePublished - Oct 10 1995
Externally publishedYes

Fingerprint

dust
apertures
synthesis
power law
flux density
T Tauri stars
thermal radiation
spectral energy distribution
emissivity
derivation
grain size
slopes
continuums
energy
index

Keywords

  • Circumstellar matter
  • Planetary systems
  • Stars: formation
  • Stars: individual (DO Tauri)

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Aperture synthesis imaging of the circumstellar dust disk around DO tauri. / Koerner, David W; Chandler, C. J.; Sargent, A. I.

In: Astrophysical Journal, Vol. 452, No. 1 PART 2, 10.10.1995.

Research output: Contribution to journalArticle

Koerner, David W ; Chandler, C. J. ; Sargent, A. I. / Aperture synthesis imaging of the circumstellar dust disk around DO tauri. In: Astrophysical Journal. 1995 ; Vol. 452, No. 1 PART 2.
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