To appear in The Astrophysical Journal Multi-Epoch Observations of HD69830: High Resolution Spectroscopy and Limits to Variability

The main-sequence solar-type star HD69830 has an unusually large amount of dusty debris orbiting close to three planets found via the radial velocity technique. In order to explore the dynamical interaction between the dust and planets, we have performed multi-epoch photometry and spectroscopy of the system over several orbits of the outer dust. We find no evidence for changes in either the dust amount or its composition, with upper limits of 5-7 % (1 σ per spectral element) on the variability of the dust spectrum over 1 year, 3.3 % (1 σ) on the broad-band disk emission over 4 years, and 33 % (1 σ) on the broad-band disk emission over 24 years. Detailed modeling of the spectrum of the emitting dust ar X i