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Nitrogen-included Carbonaceous Compounds (NCC): Laboratory-synthesized organics as the probable candidate for the carrier of the UIR bands observed in dusty classical novae

Published online by Cambridge University Press:  13 January 2020

Izumi Endo
Affiliation:
University of Tokyo7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033, Japan
Itsuki Sakon
Affiliation:
University of Tokyo7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033, Japan
Takashi Onaka
Affiliation:
University of Tokyo7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033, Japan
Andrew L. Helton
Affiliation:
SOFIA Science Center, USRA, NASA Ames Research Center MS N232-12, Moffett Field, CA 94035, USA
Ryan M. Lau
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Seiji Kimura
Affiliation:
The University of Electro-Communications 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan
Setsuko Wada
Affiliation:
The University of Electro-Communications 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan
Nanako Ogawa
Affiliation:
Japan Agency for Marine-Earth Science and Technology 2-15, Natsushima-cho, Yokosuka-city Kanagawa 237-0061Japan
Naohiko Ohkouchi
Affiliation:
Japan Agency for Marine-Earth Science and Technology 2-15, Natsushima-cho, Yokosuka-city Kanagawa 237-0061Japan
Yoko Kebukawa
Affiliation:
Yokohama National University795 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 2408501, Japan
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Abstract

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The unidentified infrared (UIR) bands have been ubiquitously observed in various astrophysical environments and consist of a series of emission features arising from aromatic and/or aliphatic C-C and C-H bonds [1]. Therefore, their carriers are thought to be related to interstellar organics. However, our knowledge on the true carriers of the UIR bands is still limited. Recently [4] has proposed Mixed Aromatic Aliphatic Organic Nanoparticles, which contains hetero atoms in addition to conventional hydrocarbon models, as a more realistic interpretation of the band carriers. The challenges toward identifying the carriers of the UIR bands are still ongoing. Past studies have shown that the UIR bands observed around classical novae, which characterized by the presence of broad feature around 8μm[2], are somewhat different from those observed in other astrophysical environment. Here we report the success of experimentally synthesizing the organics called Nitrogen-included Carbonaceous Compounds (NCC; [7]) whose infrared properties can reproduce the UIR bands observed in classical novae.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020 

References

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