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We present infrared multi-epoch observations of the dust forming nova V1280Sco over $\sim$2000 days from the outburst. The temporal evolution of theinfrared spectral energy distributions at 1272, 1616 and 1947 days can beexplained by the emissions produced by amorphous carbon dust of mass(6.6--8.7)$\times$10$^{-8}$M$_{\odot}$ with a representative grain size of0.01$~\mu$m and astronomical silicate dust of mass(3.4--4.3)$\times$10$^{-7}$M$_{\odot}$ with a representative grain size of0.3--0.5$~\mu$m. Both of these dust species travel farther away from the whitedwarf without an apparent mass evolution throughout those later epochs. Thedust formation scenario around V1280 Sco suggested from our analyses is thatthe amorphous carbon dust is formed in the nova ejecta followed by theformation of silicate dust in the expanding nova ejecta or as a result of theinteraction between the nova wind and the circumstellar medium.

Concurrent Formation of Carbon and Silicate Dust in Nova V1280 Sco