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T Cha is a nearby (d = 100 pc) transition disk known to have an opticallythin gap separating optically thick inner and outer disk components. Huelamo etal. (2011) recently reported the presence of a low-mass object candidate withinthe gap of the T Cha disk, giving credence to the suspected planetary origin ofthis gap. Here we present the Herschel photometry (70, 160, 250, 350, and 500micron) of T Cha from the "Dust, Ice, and Gas in Time" (DIGIT) Key Program,which bridges the wavelength range between existing Spitzer and millimeter dataand provide important constraints on the outer disk properties of thisextraordinary system. We model the entire optical to millimeter wavelengthspectral energy distribution (SED) of T Cha (19 data points between 0.36 and3300 micron without any major gaps in wavelength coverage). T Cha shows a steepspectral slope in the far-IR, which we find clearly favors models with outerdisks containing little or no dust beyond 40 AU. The full SED can be modeledequally well with either an outer disk that is very compact (only a few AUwide) or a much larger one that has a very steep surface density profile. Thatis, T Cha's outer disk seems to be either very small or very tenuous. Bothscenarios suggest a highly unusual outer disk and have important but differentimplications for the nature of T Cha. Spatially resolved images are needed todistinguish between the two scenarios.

Herschel Observations of the T Cha Transition Disk: Constraining the Outer Disk Properties