Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mwac.meet..t03c&link_type=abstract
Midwest Astrochemistry Meeting 2011, held 21-22 October at the University of Illinois at Urbana-Champaign. http://midwest.astroc
Astronomy and Astrophysics
Astronomy
Scientific paper
Over the past decade we have isolated protoplanetary disks that have gaps or holes within the innermost radii. These systems, dubbed "transition disks," may be the evidence for the presence of a young planet or planetary system. We report here on the results of a detailed study of the chemistry of these unique disks. Based on our analysis, we predict that these objects should have an active gas-phase chemistry at the inner edge due to the normal angle of incidence of stellar irradiation at the truncation radius where the midplane is revealed and heated by the central star. The result is an enhanced abundance of gas-phase molecules that should present itself in the form of bright ring-shaped line emission in resolved observations, such as those anticipated from ALMA. This feature should be especially apparent at high-J rotational transitions excited in the dense midplane material. For this presentation I will discuss select model results for a transition disk with a ~45AU inner hole and highlight upcoming parameter studies for a variety of disk geometries.
Bergin Edwin A.
Cleeves Ilsedore L.
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