A Disk Census for New Low-Mass Members of TWA

We propose to conduct a protoplanetary and debris disk survey of 14 recentlyidentified members of the benchmark (10 Myr) TW Hya Association (TWA). Our new sample expands the member census by tripling of the lowmass population (>M5; <0.2 M_sun). TWA represents a critical age where the longestlived protoplanetary disks and the youngest debris disks overlap in the same population, so it offers a critical window into the formation and evolution of planetary systems. We specifically propose a PACS 70/160 micron photometric census to identify new disks, and followed by SPIRE 200/250/350 micron photometric observations of all newlyidentified disk systems to characterize their SEDs and determine the nature of their circumstellar disks (protoplanetary or debris). Based on the disk fraction among known latetype members (3/6 50%), we estimate that 67 of our targets are likely to host circumstellar disks; these disks have been incredibly rare until now, so each will be a prime target for future studies of accretion, disk evolution, and planet formation. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]