Silicate dust in the environment of RS Ophiuchi following the 2006 eruption

Abstract

We present further Spitzer Space Telescope observations of the recurrent nova RS Ophiuchi, obtained over the period 208-430 days after the 2006 eruption. The later Spitzer IRS data show that the line emission and free-free continuum emission reported earlier is declining, revealing incontrovertible evidence for the presence of silicate emission features at 9.7 and 18microns. We conclude that the silicate dust survives the hard radiation impulse and shock blast wave from the eruption. The existence of the extant dust may have significant implications for understanding the propagation of shocks through the red giant wind and likely wind geometry.

12 pages, 4 figures, accepted for publication in ApJ (Letters)

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• High Resolution X-ray Spectra of RS Ophiuchi (2006 and 2021): Revealing the cause of SSS variability
• Novalike Cataclysmic Variables in the Infrared
• A WISE view of novae. I. The data
• Gas phase SiO in the circumstellar environment of the recurrent nova T Coronae Borealis
• Infrared spectroscopy of the 2019 eruption of the recurrent nova V3890 Sgr: separation into equatorial and polar winds revealed
• Transient and asymmetric dust structures in the TeV-bright nova RS Oph revealed by spectropolarimetry
• The recurrent nova V3890~Sgr: a near-infrared and optical study of the red giant component and its environment
• Rise and fall of silicate dust in RS Ophiuchi following the 2006 eruption
• Stringent limits on ${}^{28}$SiO maser emission from the recurrent nova T Coronae Borealis