Imaging the small-scale circumstellar gas around T Tauri stars

D. W. Koerner, A. I. Sargent

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

We have detected circumstellar molecular gas around a small sample of T Tauri stars through aperture synthesis imaging of CO(2→1) emission at ∼2″-3″ resolution. RY Tauri, DL Tauri, DO Tauri, and AS 209 show resolved and elongated gaseous emission. For RY Tau, the deconvolved, half-maximum radius along the direction of elongation, P.A.∼48°, is 110 AU. Corresponding radii and orientations for the other sources are: DL Tau - 250 AU at P.A.∼84°; DO Tau - 350 AU at P.A.∼160°; AS 209-290 AU at P.A.∼138°. RY Tau, DL Tau, and AS 209 show velocity gradients parallel to the elongation, suggesting that the circumstellar material is rotating. RY Tau and AS 209 also exhibit double-peaked spectra characteristic of a rotating disk. Line emission from DO Tau is dominated by high-velocity blueshifted gas which complicates the interpretation. Nevertheless, there is in each case sufficient evidence to speculate that the circumstellar emission may arise from a protoplanetary disk similar to that from which our solar system formed.

Original languageEnglish (US)
Pages (from-to)2138-2145
Number of pages8
JournalAstronomical Journal
Volume109
Issue number5
StatePublished - May 1995
Externally publishedYes

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T Tauri stars
gases
gas
elongation
radii
protoplanetary disks
rotating disks
molecular gases
solar system
apertures
gradients
synthesis

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Imaging the small-scale circumstellar gas around T Tauri stars. / Koerner, D. W.; Sargent, A. I.

In: Astronomical Journal, Vol. 109, No. 5, 05.1995, p. 2138-2145.

Research output: Contribution to journalArticle

Koerner, D. W. ; Sargent, A. I. / Imaging the small-scale circumstellar gas around T Tauri stars. In: Astronomical Journal. 1995 ; Vol. 109, No. 5. pp. 2138-2145.
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