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Towards the identification of carriers of the unidentified infrared (UIR) bands in novae

Published online by Cambridge University Press:  30 November 2022

Izumi Endo Open the ORCID record for Izumi Endo [Opens in a new window] ,
Itsuki Sakon ,
Takashi Onaka ,
Yuki Kimura ,
Seiji Kimura ,
Setsuko Wada ,
L. Andrew Helton ,
Ryan M. Lau ,
Yoko Kebukawa  and
Yasuji Muramatsu
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Izumi Endo
Affiliation:
University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan
Itsuki Sakon
Affiliation:
University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan
Takashi Onaka
Affiliation:
University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan Meisei University, 2-1-1 Hodokubo, Hino, Tokyo 191-8506, Japan
Yuki Kimura
Affiliation:
Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan
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
L. Andrew Helton
Affiliation:
SOFIA Science Center/NASA Ames Research Center, MS 211-1, P.O. Box 1, Moffett Field, CA 94035-0001, USA
Ryan M. Lau
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, 229-8510, Japan
Yoko Kebukawa
Affiliation:
Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
Yasuji Muramatsu
Affiliation:
University of Hyogo, 2167 Shosha, Himeji-shi, Hyogo, 671-2280, Japan
Nanako O. Ogawa
Affiliation:
Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-Cho, Yokosuka, 237-0061, Japan
Naohiko Ohkouchi
Affiliation:
Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-Cho, Yokosuka, 237-0061, Japan
Masato Nakamura
Affiliation:
Nihon University, Narashinodai, Funabashi 274-8501, Japan
Sun Kwok
Affiliation:
The University of British Columbia, 2329 West Mall Vancouver, V6T 1Z4, Canada
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Abstract

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The unidentified infrared (UIR) bands, whose carriers are thought to be organics, have been widely observed in various astrophysical environments. However, our knowledge of the detailed chemical composition and formation process of the carriers is still limited. We have synthesized laboratory organics named Quenched Nitrogen-included Carbonaceous Composite (QNCC) by quenching plasma produced from nitrogen gas and hydrocarbon solids. Infrared and X-ray analyses of QNCC showed that infrared properties of QNCC well reproduce the UIR bands observed in novae and amine structures contained in QNCC play an important role in the origin of the broad 8 m feature, which characterizes the UIR bands in novae. QNCC is at present the best laboratory analog of organic dust formed around dusty classical novae, which carries the UIR bands in novae via thermal emission process [Endo et al.(2021)].

Keywords

(stars:) novaecataclysmic variablesISM: lines and bandsinfrared: ISM
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 327 - 331
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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