SiS line list

We present the detection of a strong and unusual band in the mid-infrared, at 13um, 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 6.7um confirms the identification Fitting the line profile shows that the molecule is located in relatively cool layers, at T~1500K. 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.