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 language | English (US) |
|---|---|
| Pages (from-to) | 2138-2145 |
| Number of pages | 8 |
| Journal | Astronomical Journal |
| Volume | 109 |
| Issue number | 5 |
| State | Published - May 1995 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Imaging the small-scale circumstellar gas around T Tauri stars
AU - Koerner, D. W.
AU - Sargent, A. I.
PY - 1995/5
Y1 - 1995/5
N2 - 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.
AB - 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.
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M3 - Article
VL - 109
SP - 2138
EP - 2145
JO - Astronomical Journal
JF - Astronomical Journal
SN - 0004-6256
IS - 5
ER -