Computer Science
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2057l&link_type=abstract
ATNF proposal C1794, Semester: April, 2009
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 mm sizes has been established for about 30 disks using the latter signature, most recently by Lommen et al. (2007) using 3 mm ATCA fluxes and existing 1mm data. For seven sources, a correlation was found between the shape of the MIR spectra and the mm SED slope, consistent with large grains at both wavelengths and throughout the disk. To extend this suggestive correlation, and to investigate the role of environment and dust processing in grain growth, we are conducting a mm survey with ATCA over a total of 5 star-forming regions and now have a decent sample of 3mm data. Here we propose to use the ATCA to observe 19 T Tauri stars in 3 star-forming regions at 7mm. These observations will provide more accurate mm spectral indices, help determine if the emission truly arises from a disk, and allow a cloud-to-cloud comparison of environmental effects of grain growth.
Bourke Tyler
Lommen Dave
Maddison Sarah
van Dishoeck Ewine
van Langevelde Huib Jan
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