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JCMT Newsletter No. 20 (MBM12)

JCMT/SCUBA detections of cold dust disks in the MBM12 young association

Michiel Hogerheijde
Steward Observatory, University of Arizona
Doug Johnstone
Herzberg Institute of Astrophysics, National Research Council of Canada
Isamu Matsuyama
University of Toronto
Ray Jayawardhana
UC Berkeley
& Muzerolle
Steward Observatory, University of Arizona

100µm image of MBM12 We report the detection of continuum emission at lambda = 850µm and 450µm from disks around four classical T Tauri systems in the MBM 12 young association (d ~ 275 pc). Assuming an average dust temperature of 25 K and typical dust properties, derived disk masses are 0.002 Solar masses for LkHa 263 A+B+C, 0.006 Solar masses¯ for S 18 A+B, 0.027 for LkHa 262, and 0.041 Solar masses for LkHa 264A. Our result for LkHa 263 is consistent with the reported value of 0.0018 Solar masses for the edge-on disk around LkHa C, but our data do not resolve this system. The detection of significant reservoirs of cold dust around classical T Tauri stars in MBM 12 with K- and L-band excess shows that these objects have not (yet) dispersed their disk material. These findings are consistent, although not uniquely, with an inside-out dispersal scenario for disks in this region. Our limited sample supports the finding that close binary systems (LkHa 263 and S 18) have less massive disks than single stars or wide binaries (LkHa 262 and 264). A paper is in preparation.




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Doug Johnstone - HIA/NRC

 


Contact: Antonio Chrysostomou. Updated: Tue Aug 17 17:32:10 HST 2004

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