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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
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
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