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Dust particles in orbit around a star drift toward the central star by thePoynting-Robertson effect and pile up by sublimation. We analytically derivethe pile-up magnitude, adopting a simple model for optical cross sections. As aresult, we find that the sublimation temperature of drifting dust particlesplays the most important role in the pile-up rather than their optical propertydoes. Dust particles with high sublimation temperature form a significant dustring, which could be found in the vicinity of the sun through in-situspacecraft measurements. While the existence of such a ring in a debris diskcould not be identified in the spectral energy distribution (SED), the size ofa dust-free zone shapes the SED. Since we analytically obtain the location andtemperature of sublimation, these analytical formulae are useful to find suchsublimation evidences.

Sublimation Temperature of Circumstellar Dust Particles and Its Importance for Dust Ring Formation