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直接分光観測による褐色矮星および系外惑星の大気構造の統一的研究

Research Project

Project/Area Number 14J07824
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Space and upper atmospheric physics
Research InstitutionNational Astronomical Observatory of Japan (2016)
The University of Tokyo (2014-2015)

Principal Investigator

空華 智子  国立天文台, 天文データセンター, 特任研究員 (40713798)

Project Period (FY) 2014-04-25 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords褐色矮星 / 赤外線天文学 / 大気構造 / 分光観測 / 大気
Outline of Annual Research Achievements

褐色矮星の3次元大気構造の解明を目標に、(1)Subaru/MOIRCSで取得した多波長同時分光モニタリング観測により取得したデータから褐色矮星の3次元大気構造の抽出を目指し、(2)また、褐色矮星の大気構造に大きな影響を与えるダストの大気中での生成消滅過程の詳細を調査し、その過程で大気モデルの改良も行った。また、(3)HSC-SSPにおいてプロジェクトを立ち上げ、褐色矮星の新規発見を目指した。

(1)Subaru/MOIRCSで取得した多波長同時分光モニタリング観測:2016年秋季に行った観測およびデータ解析の結果、今回の観測データからは、観測装置由来の原因(要求値より低い装置のポインティング精度や、装置自身の大きな変動)により、褐色矮星自身のスペクトル変動のみの抽出が困難であることが判明した。そのため、今回得られた結果をもとに観測手法的改善を検討した(2017年春季天文年会にて発表)。
(2)褐色矮星大気中のダストサイズ:褐色矮星の大気中のダストのサイズに着目し、ダストサイズが大気構造やスペクトル形状に与える影響、およびダストサイズと温度などの他物理量との相関関係を明らかにした(論文執筆中)。この過程で、ダストサイズをフリーパラメータとして扱えるよう計算コード・システムを改良した。
(3)Subaru/HSCのプロジェクトにおける褐色矮星候補天体の探査:Subaru/HSCのプロジェクト「HSC Project 221: Hunt for faint and distant brown dwarfs」を立ち上げた。HSC-SSPデータから色-色図を作成し、褐色矮星候補天体を探査した。また、HSC-SSPデータから個数密度を導出し過去の観測やモデルとの比較を行った結果、理論モデルとほぼ一致することを示した(論文執筆中)。

Research Progress Status

28年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

28年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • 2014 Annual Research Report
  • Research Products

    (17 results)

All 2017 2016 2015 2014

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Acknowledgement Compliant: 7 results,  Open Access: 6 results) Presentation (7 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Book (2 results)

  • [Journal Article] A Signature Of Chromospheric Activity In Brown Dwarfs: A Recent Result From NIRLT Mission Program2017

    • Author(s)
      Satoko Sorahana, Takeru K. Suzuki, and Issei Yamamura
    • Journal Title

      Publications of The Korean Astronomical Society

      Volume: 32 Pages: 131-133

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Carbon-to-oxygen Ratios in M Dwarfs and Solar-type Stars2016

    • Author(s)
      Tadashi Nakajima and Satoko Sorahana
    • Journal Title

      Astrophysical Journal

      Volume: 830 Issue: 2 Pages: 159-167

    • DOI

      10.3847/0004-637x/830/2/159

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] New, Near-to-Mid Infrared High-Contrast Imaging of the Young Extrasolar Planets, HR 8799 bcde2015

    • Author(s)
      Currie, Thayne M.; Burrows, Adam Seth; Girard, Julien; Cloutier, Ryan; Fukagawa, Misato; Sorahana, Satoko; Kuchner, Marc J.; Kenyon, Scott; Madhusudhan, Nikku; Itoh, Yoichi; Jayawardhana, Ray; Matsumura, Soko; Pyo, Tae-Soo
    • Journal Title

      American Astronomical Society

      Volume: 47

    • Related Report
      2015 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Deep Thermal Infrared Imaging of HR 8799 bcde: New Atmospheric Constraints and Limits on a Fifth Planet2014

    • Author(s)
      Currie, Thayne; Burrows, Adam; Girard, Julien H.; Cloutier, Ryan; Fukagawa, Misato; Sorahana, Satoko; Kuchner, Marc; Kenyon, Scott J.; Madhusudhan, Nikku; Itoh, Yoichi; Jayawardhana, Ray; Matsumura, Soko; Pyo, Tae-Soo
    • Journal Title

      The Astrophysical Journal

      Volume: 795 Issue: 2 Pages: 133-147

    • DOI

      10.1088/0004-637x/795/2/133

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] AKARI Observations of Brown Dwarfs. IV. Effect of Elemental Abundances on Near-infrared Spectra between 1.0 and 5.0 μm2014

    • Author(s)
      Sorahana, Satoko.; Yamamura, Issei.
    • Journal Title

      The Astrophysical Journal

      Volume: 793 Issue: 1 Pages: 47-64

    • DOI

      10.1088/0004-637x/793/1/47

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] A Data-driven Approach for Retrieving Temperatures and Abundances in Brown Dwarf Atmospheres2014

    • Author(s)
      Line, Michael R.; Fortney, Jonathan J.; Marley, Mark S.; Sorahana, Satoko
    • Journal Title

      The Astrophysical Journal

      Volume: 793 Issue: 1 Pages: 33-43

    • DOI

      10.1088/0004-637x/793/1/33

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] CHARIS science: performance simulations for the Subaru Telescope's third-generation of exoplanet imaging instrumentation2014

    • Author(s)
      Brandt, Timothy D.; Sorahana Satoko (18/24)
    • Journal Title

      Proceedings of the SPIE

      Volume: 9148 Pages: 49-61

    • DOI

      10.1117/12.2057256

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] A signature of chromospheric activity in brown dwarfs revealed by 2.5-5.0 μm AKARI spectra2014

    • Author(s)
      Satoko Sorahana, Takeru K. Suzuki, Issei Yamamura
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 440 Issue: 4 Pages: 3675-3684

    • DOI

      10.1093/mnras/stu479

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] すばる/MOIRCSの多波長同時分光モニタリング観測により求めた褐色矮星の3次元構造2017

    • Author(s)
      空華智子
    • Organizer
      2017年春季天文年会
    • Place of Presentation
      九州大学(福岡県福岡市)
    • Year and Date
      2017-03-15
    • Related Report
      2016 Annual Research Report
  • [Presentation] Substellar Spectroscopy2016

    • Author(s)
      Satoko Sorahana
    • Organizer
      Exoplanets and Disks:Their Formation and Diversity III
    • Place of Presentation
      Ishigaki-shi (Okinawa)
    • Year and Date
      2016-02-21
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ダスト分布を考慮した褐色矮星の赤外線スペクトルの解析2015

    • Author(s)
      空華 智子
    • Organizer
      日本天文学会2015年秋季年会
    • Place of Presentation
      甲南大学 (兵庫)
    • Year and Date
      2015-09-09
    • Related Report
      2015 Annual Research Report
  • [Presentation] Recent Results of Brown Dwarf Atmospheres from AKARI NIR Spectra2015

    • Author(s)
      Satoko Sorahana
    • Organizer
      Workshop on Exoplanets in JFY2014
    • Place of Presentation
      The University of Tokyo (Tokyo)
    • Year and Date
      2015-03-02 – 2015-03-03
    • Related Report
      2014 Annual Research Report
  • [Presentation] A Signature of Chromospheric Activity in Brown Dwarfs Revealed by Near-Infrared Spectra2014

    • Author(s)
      Satoko Sorahana
    • Organizer
      Electrification in dusty atmospheres inside and outside the solar system
    • Place of Presentation
      Pitlochry (United Kingdom)
    • Year and Date
      2014-09-08 – 2014-09-11
    • Related Report
      2014 Annual Research Report
  • [Presentation] Brown Dwarf Atmospheres Revealed with AKARI NIR Spectra2014

    • Author(s)
      Satoko Sorahana
    • Organizer
      Meeting on exoplanets
    • Place of Presentation
      Tokyo Institute of Technology (Tokyo)
    • Year and Date
      2014-07-17
    • Related Report
      2014 Annual Research Report
  • [Presentation] A Signature of Chromospheric Activity in Brown Dwarfs: Recent Result from NIRLT Mission Programme2014

    • Author(s)
      Satoko Sorahana
    • Organizer
      The Universe in the light of AKARI Synergy with future Large Space Telescopes
    • Place of Presentation
      Oxford (United Kingdom)
    • Year and Date
      2014-07-09 – 2014-07-11
    • Related Report
      2014 Annual Research Report
  • [Book] 天文月報 2014年9月号2014

    • Author(s)
      空華 智子
    • Publisher
      公益社団法人 日本天文学会
    • Related Report
      2014 Annual Research Report
  • [Book] 天文月報 2014年6月号2014

    • Author(s)
      空華 智子
    • Publisher
      公益社団法人 日本天文学会
    • Related Report
      2014 Annual Research Report

URL: 

Published: 2015-01-22   Modified: 2024-03-26  

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