Cool Stars 14 - Submitted Abstract # 72 This version created on 05 October 2006 Characterizing the disk around the brown dwarf planetary system 2MASSW J1207334-393254 Basmah Riaz, University of Delaware John E. Gizis, University of Delaware The brown dwarf planetary system 2MASSW J1207334-393254 consists of a 30 MJUP primary and a 5 MJUP extrasolar planet. The primary is known to be undergoing active accretion, and harbors a circumsubstellar disk of gas and dust, detected by excess emission in the IR. Previous measurements of IR excess emission were too few in number to correctly model the disk spectral energy distribution. Existing results suggest a high inclination angle (> 60º) with an inner hole that can be fit by both a large grain size, large inclination angle flared disk and a small grain size flat disk. Using our SPITZER observations from 3.6 to 24 micron, we are trying to fit disk models described in Walker et al. (2003) and determine important disk parameters. We believe our 24 micron data point is valuable in determining the surface geometry of the disk, as it probes more distant regions (~1AU) from the central object. An estimate of the outer disk radius will be important to show if the planetary companion has any effect on disk emission. We have extended our work to another TWA BD, 2MASSW J1139511-315921, that shows evidence of inner disk clearing, as no excess emission was detected shortward of 24 micron. The excess at 24 micron, however, is inadequate to determine the disk geometry, and our model fit suggests that for such a 'transition disk', measurements at longer wavelengths are required to find out if the disk flares up at larger radii from the central object. ----------------------------------