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A Comprehensive Study of Brown Dwarf and Exoplanet Atmospheres
https://jaxa.repo.nii.ac.jp/records/3057
https://jaxa.repo.nii.ac.jp/records/3057682d1b07-0daa-48af-94fb-fad8b9507370
名前 / ファイル | ライセンス | アクション |
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AA1730027080.pdf (872.1 kB)
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Item type | 会議発表論文 / Conference Paper(1) | |||||
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公開日 | 2018-05-07 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | A Comprehensive Study of Brown Dwarf and Exoplanet Atmospheres | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_5794 | |||||
資源タイプ | conference paper | |||||
著者 |
空華, 智子
× 空華, 智子× Sorahana, Satoko |
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著者所属 | ||||||
名古屋大学 | ||||||
著者所属(英) | ||||||
en | ||||||
Nagoya University | ||||||
出版者 | ||||||
出版者 | 宇宙航空研究開発機構(JAXA) | |||||
出版者(英) | ||||||
出版者 | Japan Aerospace Exploration Agency (JAXA) | |||||
書誌情報 |
宇宙航空研究開発機構特別資料 en : JAXA Special Publication: Proceedings of the SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe 巻 JAXA-SP-17-010E, p. 369-371, 発行日 2018-03-09 |
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会議概要(会議名, 開催地, 会期, 主催者等)(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe (June 18-21, 2013. Ito Hall, the University of Tokyo), Bunkyou-ku, Tokyo, Japan | |||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | We present an analysis of brown dwarf spectra taken by AKARI, a Japanese infrared astronomical satellite. We observed 27 brown dwarfs, and for the first time obtained good continuous spectra between 2.5 and 5.0 μm for 16 sources. We investigate the appearance of the CH4 (3.3 μm), CO2 (4.2 μm) and CO (4.6 μm) molecular absorption bands in this new wavelength range along their spectral types, and attempt to interpret these results with the Unified Cloudy Model (UCM), a theoretical brown dwarf atmosphere model. We find that the physical and chemical structures in the brown dwarf atmospheres deviate from theoretical predictions for local thermodynamic equilibrium (LTE) with solar metallicity. As our first trial for improving UCM, we focus on “elemental abundances". We find that the CO2 band is better reproduced by a model with revised C & O abundances than the solar elemental abundance model, except for very late-T dwarfs. There are two types of brown dwarfs: isolated objects, the targets of our current study, and objects orbiting around a primary star (extra gas planets). We are also interested in the atmospheres of such extra gas planets, especially, those having relatively longer orbital radii and masses and temperatures similar to those of brown dwarfs. To understand their atmospheres, we should compare these two types of objects through the analysis of infrared spectra. This study may also inform us about the origin of gas planet formation. We will observe such extra gas planets with SPICA/SCI, and gain a comprehensive understanding of atmospheres from brown dwarfs to gas planets. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 形態: カラー図版あり | |||||
内容記述(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Physical characteristics: Original contains color illustrations | |||||
ISSNONLINE | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 2433-2232 | |||||
資料番号 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 資料番号: AA1730027080 | |||||
レポート番号 | ||||||
内容記述タイプ | Other | |||||
内容記述 | レポート番号: JAXA-SP-17-010E |