Computer Science
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1306l&link_type=abstract
ATNF proposal C1794, Semester: April, 2008
Computer Science
Stellar, Galactic, Atca
Scientific paper
The growth of dust grains by collisional coagulation in disks around young stars is the first step towards building planets. It can only be probed by the shape of the mid-IR silicate features, and the slope of the mm SED. Grain growth up to millimetre sizes has been established for about 30 disks using the latter signature, most recently by Lommen et al., who combined ATCA 3mm fluxes with 1mm band fluxes from the literature. For seven of their sources a correlation was found between the shape of the mid-IR features and the (sub)mm slope, consistent with the presence of large grains at both wavelengths. To extend this suggestive correlation between mid-IR and millimetre growth signatures, and to start to investigate the role of cloud environment and degree of dust processing in grain growth, we would like to increase the sample through ATCA observations. We propose to use the ATCA for 84 hours to observe 12 T Tauri stars in 3 southern star-forming regions. These observations will provide millimetre spectral indices, determine if the emission truly arises from a disk, and allow a cloud-to-cloud comparison of grain growth to search for environmental effects.
Bourke Tyler
Lommen Dave
Maddison Sarah
van Dishoeck Ewine
van Langevelde Huib Jan
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