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We present high angular resolution observations with the Keck Interferometer,high dispersion spectroscopic observations with Keck/NIRSPEC, and near-IRphotometric observations from PAIRITEL of a sample of 11 solar-type T Tauristars in 9 systems. We use these observations to probe the circumstellarmaterial within 1 AU of these young stars, measuring thecircumstellar-to-stellar flux ratios and angular size scales of the 2.2 micronemission. Our sample spans a range of stellar luminosities and mass accretionrates, allowing investigation of potential correlations between inner diskproperties and stellar or accretion properties. We suggest that the mechanismby which the dusty inner disk is truncated may depend on the accretion rate ofthe source; in objects with low accretion rates, the stellar magnetospheres maytruncate the disks, while sublimation may truncate dusty disks around sourceswith higher accretion rates. We have also included in our sample objects thatare known to be highly variable (based on previous photometric andspectroscopic observations), and for several sources, we obtained multipleepochs of spectroscopic and interferometric data, supplemented by near-IRphotometric monitoring, to search for inner disk variability. Whiletime-variable veilings and accretion rates are observed in some sources, nostrong evidence for inner disk pulsation is found.

Near-Infrared Interferometric, Spectroscopic, and Photometric Monitoring of T Tauri Inner Disks