Abstract |
A classical nova is an important phenomenon, which provides us valuable opportunity to trace temporal development of dust condensation events and chemical/physical evolution processes of circumstellar dust on a practical timescale for human beings. We have collected multi-epoch N- \& Q-band imaging and N-band low-resolution spectroscopic datasets of dust Forming nova V1280Sco in 2007--2011; Day 150 with Subaru/COMICS and Days 1272, 1616, and 1947 with Gemini-South/TReCS. Mid-Infrared spectral energy distributions (SEDs) of V1280Sco collected at 1272, 1616 and 1947 have shown the presence of both carbonaceous and silicate dust in emission. As a result of our detailed analyses of the temporal evolution of the SEDs of V1280Sco, the dust formation history of V1280Sco that the amorphous carbons were the newly formed dust in the nova wind while the silicate dust were the pre-existing circumstellar dust was demonstrated. |