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On the atmospheric chemical processes of Titan revealed by the terahertz spectroscopic big-data produced with ALMA

Research Project

Project/Area Number 19K14782
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17010:Space and planetary sciences-related
Research InstitutionThe University of Tokyo

Principal Investigator

Iino Takahiro  東京大学, 情報基盤センター, 特任准教授 (40750493)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Discontinued (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords電波天文学 / 大気化学 / 大気物理 / リモートセンシング / テラヘルツ / ビッグデータ / 逆問題 / 最適化問題 / アルマ
Outline of Research at the Start

土星最大の衛星タイタンの大気中には,ベンゼンやアセトニトリルなどの分子量の大きい分子ガスが含まれ,その組成は太陽系で最も複雑と言える.

我々はアルマ望遠鏡が生成する高感度・高空間分解能・高時間分解能・広周波数帯域のデータ群を利活用し,タイタンの分光ビッグデータを生成してきた.本データ群から,各微量分子ガスの3次元分布や時間変動,同位体比の導出を行い,タイタンの大気化学の解明を目指す.

Outline of Final Research Achievements

Using the ALMA interferometer, the world's largest terahertz remote sensor, we have developed and verified a technology platform for atmospheric remote sensing comparable to spacecraft, and studied atmospheric chemical processes using this technology. The most important result of this research is the derivation of nitrogen isotopic ratio in the acetonitrile molecule on Saturn's moon Titan. The obtained values are comparable to those of nitrogen molecule, indicating that acetonitrile may be formed directly from nitrogen molecules via galactic cosmic ray induced dissociation.

Academic Significance and Societal Importance of the Research Achievements

近年,地上大型望遠鏡の技術革新により,太陽系外惑星大気の組成までもが観測的に明らかにされつつある.翻って,太陽系内惑星大気の観測的研究は,ボイジャーやカッシーニといった探査機によりブレイクスルーがもたらされてきたが,探査機の利活用の機会は極端に限定されている.本研究では,特に太陽系外天体の観測において用いられてきた地上大型電波望遠鏡を太陽系内惑星大気の観測においても利活用することで,探査機に比肩する大気化学・大気物理観測の基盤技術開発と,これを用いた惑星大気環境の解明という成果を上げてきた.今後は本研究を基盤として,タイタン・海王星の大気環境をさらに詳らかにしていく.

Report

(3 results)
  • 2021 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Research-status Report
  • Research Products

    (15 results)

All 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 1 results) Remarks (3 results)

  • [Int'l Joint Research] NASAゴダード宇宙飛行センター(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] NASAゴダード宇宙飛行センター(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] A Belt-like Distribution of Gaseous Hydrogen Cyanide on Neptune’s Equatorial Stratosphere Detected by ALMA2020

    • Author(s)
      Iino T., Sagawa H., Tsukagoshi T., Nozawa S.
    • Journal Title

      The Astrophysical Journal

      Volume: 903 Issue: 1 Pages: L1-L1

    • DOI

      10.3847/2041-8213/abbb9a

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 14N/15N Isotopic Ratio in CH3CN of Titan’s Atmosphere Measured with ALMA2020

    • Author(s)
      Iino Takahiro、Sagawa Hideo、Tsukagoshi Takashi
    • Journal Title

      The Astrophysical Journal

      Volume: 890 Issue: 2 Pages: 95-95

    • DOI

      10.3847/1538-4357/ab66b0

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ALMAで検出された海王星成層圏HCNの帯状分布構造とその化学・物理2021

    • Author(s)
      飯野孝浩,佐川英夫,塚越崇,野澤悟徳
    • Organizer
      日本天文学会春季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ALMA observations of Titan's atmospheric composition and isotopic ratios2021

    • Author(s)
      飯野孝浩,佐川英夫,塚越崇
    • Organizer
      惑星圏研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] A belt-like distribution of gaseous hydrogen cyanide on Neptune's equatorial stratosphere detected by ALMA2021

    • Author(s)
      飯野孝浩,佐川英夫,塚越崇,野澤悟徳
    • Organizer
      惑星圏研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] アルマを用いたタイタン大気中アセトニトリルにおける14N/15N同位体比が解き明かす,銀河宇宙線の大気化学過程への影響2020

    • Author(s)
      飯野孝浩,佐川英夫,塚越崇
    • Organizer
      地球惑星科学連合大会
    • Related Report
      2020 Annual Research Report 2019 Research-status Report
  • [Presentation] A belt-like distribution of gaseous hydrogen cyanide on Neptune's equatorial stratosphere detected by ALMA2020

    • Author(s)
      飯野孝浩
    • Organizer
      Nobeyama Science Workshop 2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] Determination of 14N/15N of CH3CN in Titan’s atmosphere with ALMA2019

    • Author(s)
      Takahiro Iino, Hideo Sagawa and Takashi Tsukagoshi
    • Organizer
      European Planetary Science Congress 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] ALMAを用いたタイタン大気アセトニトリルにおける窒素同位体比の初計測と,銀河宇宙線由来大気化学過程への制約2019

    • Author(s)
      飯野孝浩,佐川英夫,塚越崇
    • Organizer
      惑星科学会秋季講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] アルマ太陽系天文学ビッグデータ」を用いた,タイタン大気微量分子時空間変動の観測的解明2019

    • Author(s)
      飯野孝浩,佐川英夫,塚越崇
    • Organizer
      地球惑星科学連合大会
    • Related Report
      2019 Research-status Report
  • [Remarks] Iino Takahiro website

    • URL

      https://www.iinotakahiro.com/

    • Related Report
      2020 Annual Research Report
  • [Remarks] 海王星の赤道に横たわる猛毒ガス「シアン化水素」の帯を世界で初めて発見

    • URL

      https://www.u-tokyo.ac.jp/focus/ja/press/z0310_00023.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] 地上大型電波望遠鏡により、土星の衛星タイタンの大気成分の詳細な観測に成功

    • URL

      https://www.u-tokyo.ac.jp/focus/ja/press/z0310_00018.html

    • Related Report
      2020 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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