  We present Spitzer Space Telescope observations of two TW Hydrae Association
brown dwarfs, 2MASSW J1207334-393254 and 2MASSW J1139511-315921, in the IRAC
and MIPS 24 micron bands. Based on their IRAC colors, we have classified them
as Classical and Weak-line T Tauri stars, respectively. For 2MASSW
J1207334-393254, we have found that a flat disk model fits the data very well.
This brown dwarf shows the presence of warm (T > 100 K) circumstellar dust
close (R < 0.2 AU) to it, and does not display any signs of cleansing of dust
within several AU of the star. In comparison with other TWA members that show
excess in IR, we suggest that there exists a different disk evolution/dust
processing mechanism for stellar and sub-stellar objects. 2MASSW
J1139511-315921 does not show any significant excess in any of the IRAC bands,
but a small one at 24 micron, which is not significant enough to suggest the
presence of warm dust around this star. It shows signs of dust cleansing in the
inner several AU, similar to most of the other TWA members.
