Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-20
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.
Ashok Nagarhalli M.
Banerjee Dipankar P. K.
Misselt Karl A.
Smith Paul S.
Su Kate Y. L.
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