Dust formation in V838 Mon and V4332 Sgr

Details Dust formation in V838 Mon and V4332 Sgr Dust formation in V838 Mon and V4332 Sgr

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50106m&link_type=abstract

Spitzer Proposal ID #50106

Physics

Scientific paper

We propose follow-up observations of the unusual eruptive variables V838 Monocerotis (V838 Mon) and V4332 Sagitarrii (V4332 Sgr) to study the early formation and evolution of dust condensates in their ejecta. Both underwent powerful eruptions (2002 and 1994, respectively) characterized by multiple peaks and cool super-giant like spectra. Shortly after eruption, an optical light echo was discovered around V838 Mon. Spitzer observations carried out by us revealed the presence of an extremely rare infrared light echo and suggest an interstellar origin for the material. While no extended emission has been noted around V4332 Sgr, it spectrum (both in the optical and the Spitzer infrared) is characterized by the presence of rare AlO radicals. More recently, our Spitzer data have shown the presence of alumina and titanium oxides in the ejecta around V4332 Sgr, the older of the two eruptions. Spectra of V838 Mon have also shown strong evidence for the presence of the these early dust condensate species. In addition to their infrared evolution, both objects have been seen to undergo significant evolution in their optical spectra. The ongoing formation and evolution of dust condensates in the ejecta of both objects provides a unique opportunity to study and test theories of dust condensation in oxygen rich environments.

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