The Nature of Transition Circumstellar Disks in Perseus, Taurus, and Auriga

Details The Nature of Transition Circumstellar Disks in Perseus, Taurus, and Auriga The Nature of Transition Circumstellar Disks in Perseus, Taurus, and Auriga

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934408c&link_type=abstract

American Astronomical Society, AAS Meeting #219, #344.08

Physics

Optics

Scientific paper

As part of an ongoing program aiming to characterize a large number of Spitzer-selected transition disks (disks with reduced levels of near-IR and/or mid-IR excess emission), we have obtained millimeter wavelength photometry, high-resolution optical spectroscopy, and adaptive optics near-infrared imaging for a sample of 31 transition objects located in the Perseus, Taurus, and Auriga molecular clouds. We use these ground-based data to estimate disk masses, multiplicity, and accretion rates in order to investigate the mechanisms potentially responsible for their inner holes. Following our previous studies in the Ophiuchus, Lupus, Corona Australis and Scorpius regions, we combine disk masses, accretion
rates and multiplicity data with other information, such as SED morphology and fractional disk luminosity to classify the disks as strong candidates for the following categories: grain-growth dominates disks (7 objects), giant planet forming disks (6 objects), photoevaporating disks (7 objects), debris disks (11 objects), and cicumbinary disks (1 object, which was also classified as a photoeavaporating disk). Combining our sample of 31 transition disks with those from our previous studies results in a sample of 74 transition objects that have been selected, characterized, and classified in an homogenous way. We discuss this combined high-quality sample in the context of the current paradigm of the evolution and dissipation of protoplanetary disks and use its properties to constrain different aspects of the key processes driving their evolution.

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