Attorocks illuminated by K Giants

Computer Science

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Scientific paper

The IRS observations of ~ 100 'debris' disks (Chen et al. 2006) showed that many of the objects further than 100 pc distant were extended in LL or LH. This is incompatible with a debris disk and, rather, indicates the IR excess comes from interstellar medium (ISM) dust illuminated by a star (the ``Pleiades effect''). This extended emission is interesting in its own right. The spectra often show clear evidence for the 20 μm silicate emission feature (Figure 1). The temperature indicated is quite high, typically 110 K. Equilibrium calculations indicate that classical silicate grains, of radius 0.1 μm, would not be nearly this hot. If the grains are ultra small (i.e. 0.01 μm radius, 10 attogram mass), the superheat would be enough to explain this phenomenon. At that size, one must also consider single-photon stochastic heating.

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