Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..713...51d&link_type=abstract
THE SEARCH FOR OTHER WORLDS: Fourteenth Astrophysics Conference. AIP Conference Proceedings, Volume 713, pp. 51-54 (2004).
Astronomy and Astrophysics
Astrophysics
Pre-Main Sequence Objects, Young Stellar Objects And Protostars, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Infrared Excess, Debris Disks, Protoplanetary Disks, Exo-Zodiacal Dust
Scientific paper
Results are described from observations of submm CO emission from isolated young stars with an infrared excess. These include both Vega-excess and isolated Herbig AeBe stars, ie those at the transition between the formation stage and the main sequence. Of those detected, more than 60% show double-peaked profiles, interpreted as emission from rotating gas disks. The spectra of three objects are compared with a basic disk model. HD 141569 has evidence of a double-ring gas structure, with radii of 90 and 250 au - similar to that seen in scattered light. MWC480 has an asymmetric line shape, interpreted as a non-axisymmetric disk temperature distribution. Finally the debris disk HD 9672 shows a broad line from a relatively compact disk or ring.
This molecular gas is found in stars of ages up to 10-20 Myr, and its' removal from the disk signifies the end of the accretion and the start of the collision-dominated phase of disk evolution.
Coulson Iain M.
Dent William R. F.
Greaves Jane S.
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