Grain Growth and Sub-Structure in Protoplanetary Disks

Details Grain Growth and Sub-Structure in Protoplanetary Disks Grain Growth and Sub-Structure in Protoplanetary Disks

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21730404w&link_type=abstract

American Astronomical Society, AAS Meeting #217, #304.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

I will describe the Disks@EVLA program to survey protoplanetary disks around pre-main-sequence stars in the nearest star forming regions (Taurus, Ophiuchus, TW Hya) to investigate the millimeter/centimeter emission from large dust particles, the last observable link in the chain from sub-micron interstellar grains to planets. At these long wavelengths, dust emission is optically thin and probes the entire disk volume, including the innermost regions that become opaque in the submillimeter. Taking advantage of the new capabilities of the EVLA, we are using a staged approach that starts with photometry of approximately 60 disk systems, currently underway, to be followed by higher resolution imaging of smaller subsets of the brighter sources, ultimately reaching scales comparable to the orbital radius of Jupiter. Key goals include (1) determining the prevalence and location of grain growth to centimeter-sized "pebbles" from spectral indices, and any dependencies on stellar properties and environment, and (2) detecting physical sub-structures such as holes and gaps indicative of disk evolution and planet formation.

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