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Exoplanet Exploration and Characterization in a Cool World

Research Project

Project/Area Number 17K14246
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Astronomy
Research InstitutionThe University of Tokyo

Principal Investigator

Kawahara Hajime  東京大学, 大学院理学系研究科(理学部), 助教 (90649758)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Discontinued (Fiscal Year 2020)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords系外惑星 / 宇宙生物学 / 惑星大気 / 惑星形成 / 長周期惑星 / 高分散コロナグラフ / 惑星マッピング / 重力レンズ / 酸化チタン / 高分散分光 / 太陽系外惑星
Outline of Final Research Achievements

A total of 67 long-period planets with only one to three transits were identified using GPUs in the Kepler data. The results show that most of the planets are Neptune-sized in radius and are located around 1 AU. This indicates that the results of microlensing of late type star orbits are also valid for solar type star orbits, which is difficult to explain by current planet formation theory. A new instrument for detecting planetary atmospheres, the High-Dispersion Coronagraph, has been constructed through Project REACH, which connects Subaru's SCExAO with IRD, and first light has been successfully performed.

Academic Significance and Societal Importance of the Research Achievements

宇宙における人類・生命というテーマからは自然と、我々は宇宙で孤独なのか、という素朴な問いが生じる。人類史上、長らく思弁的に捉えられてきたこの疑問は、1995年の太陽系外惑星の発見以来、科学的に解答可能な具体的問題として宇宙科学の最重要課題の一つとなった。本研究の成果は将来の地球型惑星探査、およびそこでの生命探査に繋がる基礎的研究である。とくに1年以上の長周期惑星の発見法を確立したこと、また緒k末津撮像での高分散分光による大気探査を開始したことが将来の地球型惑星探査にとってインパクトがあると考えられる。

Report

(4 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (22 results)

All 2020 2019 2018 2017 Other

All Journal Article (13 results) (of which Int'l Joint Research: 12 results,  Peer Reviewed: 13 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 4 results,  Invited: 5 results) Book (1 results) Remarks (1 results)

  • [Journal Article] Mutual Orbital Inclinations between Cold Jupiters and Inner Super-Earths2020

    • Author(s)
      Masuda Kento、Winn Joshua N.、Kawahara Hajime
    • Journal Title

      The Astronomical Journal

      Volume: 159 Issue: 2 Pages: 38-38

    • DOI

      10.3847/1538-3881/ab5c1d

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Global Mapping of an Exo-Earth using Sparse Modeling2020

    • Author(s)
      Masataka Aizawa, Hajime Kawahara, Siteng Fan
    • Journal Title

      The Astrophysical Journal

      Volume: 896 Issue: 1 Pages: 1-1

    • DOI

      10.3847/1538-4357/ab8d30

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Global Mapping of the Surface Composition on an Exo-Earth Using Color Variability2020

    • Author(s)
      Kawahara Hajime
    • Journal Title

      The Astrophysical Journal

      Volume: 894 Issue: 1 Pages: 58-58

    • DOI

      10.3847/1538-4357/ab87a1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Transiting Planets Near the Snow Line from Kepler. I. Catalog2019

    • Author(s)
      Kawahara Hajime、Masuda Kento
    • Journal Title

      The Astronomical Journal

      Volume: 157 Issue: 6 Pages: 218-218

    • DOI

      10.3847/1538-3881/ab18ab

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Self-lensing Discovery of a 0.2 M White Dwarf in an Unusually Wide Orbit around a Sun-like Star2019

    • Author(s)
      Masuda Kento、Kawahara Hajime、Latham David W.、Bieryla Allyson、Kunitomo Masanobu、MacLeod Morgan、Aoki Wako
    • Journal Title

      The Astrophysical Journal

      Volume: 881 Issue: 1 Pages: L3-L3

    • DOI

      10.3847/2041-8213/ab321b

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Transiting Planets near the Snow Line from Kepler. I. Catalog2019

    • Author(s)
      Kawahara and Masuda
    • Journal Title

      The Astronomical Journal

      Volume: 印刷中

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Back to “Normal” for the Disintegrating Planet Candidate KIC 12557548 b2018

    • Author(s)
      Schlawin Everett、Hirano Teruyuki、Kawahara Hajima、Teske Johanna、Green Elizabeth M.、Rackham Benjamin V.、Fraine Jonathan、Bushra Rafia
    • Journal Title

      The Astronomical Journal

      Volume: 156 Issue: 6 Pages: 281-281

    • DOI

      10.3847/1538-3881/aaeb32

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A Linear and Quadratic Time-Frequency Analysis of Gravitational Waves from Core-Collapse Supernovae2018

    • Author(s)
      Hajime Kawahara, Takami Kuroda, Tomoya Takiwaki, Kazuhiro Hayama, Kei Kotake
    • Journal Title

      The Astrophysical Journal

      Volume: 867 Issue: 2 Pages: 126-126

    • DOI

      10.3847/1538-4357/aae57b

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] X-ray study of the double radio relic Abell 3376 with Suzaku2018

    • Author(s)
      I. Urdampilleta, H. Akamatsu, F. Mernier, J. S. Kaastra, J. de Plaa, T. Ohashi, Y. Ishisaki, H. Kawahara
    • Journal Title

      Astronomy and Astrophysics

      Volume: 618 Pages: A74-A74

    • DOI

      10.1051/0004-6361/201732496

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Discovery of three self-lensing binaries from Kepler2018

    • Author(s)
      Hajime Kawahara, Kento Masuda, Morgan MacLeod, David W. Latham, Allyson Bieryla, Othman Benomar
    • Journal Title

      the Astronomical Journal

      Volume: 155 Issue: 3 Pages: 144-144

    • DOI

      10.3847/1538-3881/aaaaaf

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Systematic Search for Rings around Kepler Planet Candidates: Constraints on Ring Size and Occurrence Rate2018

    • Author(s)
      Masataka Aizawa, Kento Masuda, Hajime Kawahara, Yasushi Suto
    • Journal Title

      the Astronomical Journal

      Volume: 155 Issue: 5 Pages: 206-206

    • DOI

      10.3847/1538-3881/aab9a1

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] High-resolution Spectroscopic Detection of TiO and a Stratosphere in the Day-side of WASP-33b2017

    • Author(s)
      Nugroho, S. K., Kawahara, H., Masuda, K., Hirano, T., Kotani, T., Tajitsu, A.
    • Journal Title

      The Astronomical Journal

      Volume: 154 Issue: 6 Pages: 221-221

    • DOI

      10.3847/1538-3881/aa9433

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Suzaku and Chandra observations of the galaxy cluster RXC J1053.7+5453 with a radio relic2017

    • Author(s)
      Itahana Madoka、Takizawa Motokazu、Akamatsu Hiroki、van Weeren Reinout J.、Kawahara Hajime、Fukazawa Yasushi、Kaastra Jelle S.、Nakazawa Kazuhiro、Ohashi Takaya、Ota Naomi、Roettgering Huub J. A.、Vink Jacco、Zandanel Fabio
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 69 Issue: 6 Pages: 88-88

    • DOI

      10.1093/pasj/psx095

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Transiting Planets near the Snow Line2019

    • Author(s)
      Hajime Kawahara
    • Organizer
      From protoplanetary disks through planetary system architecture to planetary atmospheres and habitability
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 超小型衛星による長周期トランジット惑星探査(LOTUS)2019

    • Author(s)
      Hajime Kawahara
    • Organizer
      超小型衛星利用シンポジウム
    • Related Report
      2018 Research-status Report
  • [Presentation] High Dispersion Spectroscopy for Exoplanet Characterization2019

    • Author(s)
      Hajime Kawahara
    • Organizer
      Symposium on Planetary Sciences 2019 (SPS2019)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Transiting exoplanet survey by micro satellites2018

    • Author(s)
      Hajime Kawahara
    • Organizer
      Nikko Japan - Latin America Academic Conference 2018 in Nikko
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 小型衛星によって第二の太陽系発見をめざす系外惑星探査計画:LOTUS2018

    • Author(s)
      Hajime Kawahara
    • Organizer
      2018年度宇宙科学技術連合大会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] How to find an Earth analog and a solar-system analog in the world of exoplanets2018

    • Author(s)
      Hajime Kawahara
    • Organizer
      JpGU 2018, B-A001 Astrobiology session
    • Related Report
      2018 Research-status Report
  • [Presentation] Finding long period objects around snowline2017

    • Author(s)
      Hajime Kawahara
    • Organizer
      Planet Formation beyond Snowlines, Tokyo, Japan,
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] 系外惑星探査2018

    • Author(s)
      河原創
    • Total Pages
      288
    • Publisher
      東京大学出版会
    • Related Report
      2017 Research-status Report
  • [Remarks] REACH: information for open use

    • URL

      http://secondearths.sakura.ne.jp/reach/

    • Related Report
      2019 Annual Research Report

URL: 

Published: 2017-04-28   Modified: 2022-01-27  

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