title: 1.1mm AzTEC on ASTE Survey of Disk Sources in the Lupus and Chamaeleon Low-Mass Star Forming Regions

authors: T. Tsukagoshi, M. Saito, M. Momose, Y. Kitamura, Y. Shimajiri, M. Hiramatsu, N. Ikeda, K. Kamegai, G. Wilson, M. Yun, D.Hughes, K. Kohno, H. Ezawa, and R. Kawabe

abstract:   We present a 1.1mm wavelength imaging survey covering 16 deg2 (~200pc2) toward the southern nearby star forming regions, Chamaeleon I, II, & III and Lupus I, II, III, & IV (d=150-200pc). The survey was performed as one of AzTEC on ASTE key projects for the systematic search of  protoplanetary disks and investigate disk evolution in the course of star/planet formation. These data were obtained in the years of 2007 and 2008 with AzTEC continuum camera on ASTE 10m sub-millimeter telescope in Chile, and the sensitivity was 10 mJy beam-1 in average (3 sigma mass for the disk sources is about a Jupiter mass). The main purposes of the observations are (1) to detect of the (new) T Tauri stars in southern hemisphere with millimeter wavelength and (2) statistical study of the evolution of a protoplanetary disk.
 We succeed to detect a millimeter continuum emission around 37 disk sources (a half of these sources is new detection), which corresponds to about 10% of young stellar objects in the observed area. Although most of the targets are found to belong to the CTTS or Class II, which are in relatively younger phase, the rest are found to belong to evolved stage, WTTS or Class III. In this presentation, I'll summarize the observational results and report the results of the detailed analysis for the peculiar source detected in the survey.