We present our latest results on near- to mid- infrared observation of SN2006jc at 200 days after the discovery using the Infrared Camera ( IRC ) on board AKARI .
The near-infrared ( 2–5 \mu m ) spectrum of SN2006jc is obtained for the first time and is found to be well interpreted in terms of the thermal emission from amorphous carbon of 800 \pm 10 K with the mass of 6.9 \pm 0.5 \times 10 ^ { -5 } M _ { \odot } that was formed in the supernova ejecta .
This dust mass newly formed in the ejecta of SN 2006jc is in a range similar to those obtained for other several dust forming core collapse supernovae based on recent observations ( i.e. , 10 ^ { -3 } – 10 ^ { -5 } M _ { \odot } ) .
Mid-infrared photometric data with AKARI /IRC MIR-S/S7 , S9W , and S11 bands have shown excess emission over the thermal emission by hot amorphous carbon of 800K .
This mid-infrared excess emission is likely to be accounted for by the emission from warm amorphous carbon dust of 320 \pm 10 K with the mass of 2.7 ^ { +0.7 } _ { -0.5 } \times 10 ^ { -3 } M _ { \odot } rather than by the band emission of astronomical silicate and/or silica grains .
This warm amorphous carbon dust is expected to have been formed in the mass loss wind associated with the Wolf-Rayet stellar activity before the SN explosion .
Our result suggests that a significant amount of dust is condensed in the mass loss wind prior to the SN explosion .
A possible contribution of emission bands by precursory SiO molecules in 7.5–9.5 \mu m is also suggested .