The detection of infrared SiS bands in spectra of S stars

Cami, J., Sloan, G. C., Markwick-Kemper, A. J., Zijlstra, Albert A., Bauschlicher Jr., C. W., Matsuura, M. ORCID: https://orcid.org/0000-0002-5529-5593, Decin, L. and Hony, S. 2008. The detection of infrared SiS bands in spectra of S stars. The Astrophysical Journal 690 (2) , L122–L125. 10.1088/0004-637x/690/2/l122

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Abstract

We present Spitzer spectra of S stars, which are cool evolved stars with a C/O ratio near unity, some of which have enhanced s-process abundances. We present the detection of a strong and unusual band in the mid-infrared, at 13 μm, within the N-band window. Using quantum-chemically calculated line lists, and model spectra, we identify this band as the fundamental rovibrational band of SiS. Detection of the overtone band at 6.7 μm confirms the identification. Fitting the line profile shows that the molecule is located in relatively cool layers, at T ∼ 1500 K. We discuss these results in the context of chemical equilibrium models. The observed strength of these bands in the cool S stars makes them a promising observational diagnostic tool for studying the atmospheres of brown dwarfs and exoplanets.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Astronomical Society
ISSN:	1538-4357
Date of Acceptance:	19 November 2008
Last Modified:	10 May 2024 14:15
URI:	https://orca.cardiff.ac.uk/id/eprint/168071

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