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Abstract: We report high spatial resolution 11.2 and 18.1 micron imaging of theeruptive variable V838 Monocerotis, obtained with Gemini Observatory-s Michellein 2007 March. The 2007 flux density of the unresolved stellar core is roughly2 times brighter than that observed in 2004. We interpret these data asevidence that V838 Mon has experienced a new circumstellar dust creation event.We also report a gap of spatially extended thermal emission over radialdistances of 1860-93000 AU from the central source, which suggests that noprior significant circumstellar dust production events have occurred within thepast 900-1500 years.

Autor: John P. Wisniewski 1, Mark Clampin 2, Karen S. Bjorkman 3, Richard K. Barry 2; 1 University of Washington, 2 NASA GSFC, 3 Univers


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