Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21931402p&link_type=abstract
American Astronomical Society, AAS Meeting #219, #314.02
Astronomy and Astrophysics
Astronomy
Scientific paper
The majority of young low-mass stars are surrounded by optically thick accretion disks. These circumstellar disks provide large reservoirs of material that will eventually be transformed into planetary systems. Theory and observations suggest that the earliest stage toward planet formation in a protoplanetary disk is the growth of particles, from sub-micron size grains to centimeter-sized pebbles. Observationally, grain growth can be inferred by measuring the spectral energy distribution at long wavelengths, which traces the continuum dust emission spectrum and hence the dust opacity.
I will present interferometric high-angular resolution observations from the Combined Array for Research in Millimeter-wave Astronomy (CARMA), the Expanded Very Large Array (EVLA), and the Submillimeter Array (SMA), that span more than an order of magnitude in wavelength (from sub-millimeter to centimeter wavelengths) and attain sub-arcsecond angular resolution. These observations constrain the radial distribution of the circumstellar material and characterize the radial variations on the dust opacity spectral slope, that may originate from particle growth in these circumstellar disks. I will present the most recent results of this observational program and compare with theoretical predictions of grain size evolution in protoplanetary disks.
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