Spectral index plot showing the Taurus Class II and Class III members with mid-IR and far-IR excess. The spectral indices; α_{3.6−8.0 μm} and α_{24−70 μm} are used to identify candidate targets with transition disks (TDs; points bounded by the horizontal and vertical dashed lines) and debris disks (points bounded by the horizontal dashed and vertical dotted lines). Targets identified in the literature with TDs, and the candidate TD/debris disks reported here, are enclosed by blue and green squares respectively. J04295422+1754041 (red cross) was unobserved with IRAC and MIPS, and the spectral indices are calculated from the WISE 3.4 μm and 12 μm flux densities, and the WISE 22 μm and PACS 70 μm flux densities. XEST 08-033 (red cross with downward arrow) was only detected with PACS at 160 μm, and the 24–70 spectral index shown is calculated from the 70 μm upper limit.