Spitzer observations of V4332 Sagittarii: Detection of Alumina Dust

Details Spitzer observations of V4332 Sagittarii: Detection of Alumina Dust Spitzer observations of V4332 Sagittarii: Detection of Alumina Dust

2007-07-20

arxiv.org/abs/0707.3119v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures in ApJ style; to be published in ApJ Letters

Scientific paper

10.1086/521528

We present broad-band 24, 70 and 160 micron photometry, 5-35 micron and 55-90 micron spectra of the eruptive variable V4332 Sgr from Spitzer observations. The distinguishing feature of the 5-35 micron spectrum is an unusually broad absorption feature near 10 micron at the position generally associated with silicate-rich dust. Through radiative transfer modeling, we show that this broad feature cannot arise from silicates alone but requires the inclusion of alumina (Al2O3) as a dust condensate. The case for including Al2O3 is strengthened further by the presence of the AlO radical, a potentially important molecule in forming Al2O3. The present detection indicates that porous alumina manifests itself through a broadening of the 9.7 micron silicate feature and additionally displays, on the shoulder of the silicate feature, a component at ~11.5 micron. We discuss how further observations of V4332 Sgr may have the potential of verifying some general predictions of the dust condensation process.

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