S18B0153

We plan to carry out N-band low-resolution spectroscopy of four recent dusty novae (V5668 Cyg, TCP J17394608-2457555, V1831 Aql and V339 Del) aiming to collect mid-infrared spectral samples of unidentified infrared (UIR) band associated with novae. Our preliminary laboratory experimental studies have revealed that the Nitrogen-included Carbonaceous Compounds (NCC) produced via plasma chemical vapor deposition (CVD) exhibit infrared absorption spectrum that is remarkably similar to the UIR bands observed in novae. Based on the XANES measurement and elemental analyses of the NCC, we concluded that the carriers of the UIR bands seen in dusty novae should probably be the NCC which has amine structures and whose N/C ratio is 4-5 %. By comparing the varieties of UIR bands associated with dusty novae collected in this program with the infrared spectra of NCC synthesized under various experimental conditions, we aim to demonstrate that NCCs are identical to the carries of the UIR bands observed in dusty novae and to attain better understanding of the origin of insoluble Organic Matter (IOM) in primitive meteorites of our solar system.


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