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Revealing the Oort cloud

Research Project

Project/Area Number 18K13606
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Arimatsu Ko  京都大学, 理学研究科, 研究員 (70770808)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords太陽系外縁部 / タイムドメイン天文学 / 惑星科学 / 冥王星 / 観測天文学 / 高時間分解能天文学
Outline of Final Research Achievements

In this study, observational methods for the detections of Oort cloud objects have been developed. Observation systems for the detections of stellar occultations by Oort cloud objects have been developed. Also, data reduction tools for detections and analyses of occultation event candidates have been developed. Through these developments, a single occultation event candidate by a Kuiper-belt object is found from archival data. In addition, multiple scientific results about known trans-Neptunian objects and movie astronomy have been obtained.

Academic Significance and Societal Importance of the Research Achievements

カントやラプラスの時代に実証科学の対象として昇華せしめられた太陽系の起源に関わる問いは、今なお一定の答えを得るには至っていない。その理由の一つには、外側太陽系への探査が実現した現代に至ってもなお、人類が太陽系の最外縁部であるオールトの雲領域の観測技術を持ち合わせていないことにある。

本研究ではオールト雲天体が恒星の手前を通過する『掩蔽』と呼ばれる天文現象を利用することで、極めて安価で小型ながら、オールト雲天体の観測を実現できる観測システムの開発を実現した。今後本格的な観測を実施することで、史上初めてオールトの雲の領域の天体の検出を実現できる見込みである。

Report

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

    (13 results)

All 2021 2020 2019 Other

All Journal Article (7 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 7 results,  Open Access: 7 results) Presentation (2 results) (of which Invited: 1 results) Remarks (4 results)

  • [Journal Article] Detectability of Optical Transients with Timescales of Subseconds2021

    • Author(s)
      Arimatsu Ko、Tsumura Kohji、Usui Fumihiko、Ootsubo Takafumi、Watanabe Jun-ichi
    • Journal Title

      The Astronomical Journal

      Volume: 161 Issue: 3 Pages: 135-135

    • DOI

      10.3847/1538-3881/abd94d

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evidence for a rapid decrease of Pluto’s atmospheric pressure revealed by a stellar occultation in 20192020

    • Author(s)
      K. Arimatsu, G. L. Hashimoto, M. Kagitani, T. Sakanoi, Y. Kasaba, R. Ohsawa, S. Urakawa
    • Journal Title

      Astronomy & Astrophysics

      Volume: 638 Pages: L5-L5

    • DOI

      10.1051/0004-6361/202037762

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Relationship between radar cross section and optical magnitude based on radar and optical simultaneous observations of faint meteors2020

    • Author(s)
      R. Ohsawa, A. Hirota, K. Morita, S. Abe, D. Kastinen, J. Kero, C. Szasz, Y. Fujiwara, T. Nakamura, K. Nishimura, S. Sako, J. Watanabe, et al.
    • Journal Title

      Planetary and Space Science

      Volume: 194 Pages: 105011-105011

    • DOI

      10.1016/j.pss.2020.105011

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] New Constraint on the Atmosphere of (50000) Quaoar from a Stellar Occultation2019

    • Author(s)
      Ko Arimatsu, Ryou Ohsawa, George L. Hashimoto, Seitaro Urakawa, Jun Takahashi, Miyako Tozuka, Yoichi Itoh, Misato Yamashita, et al.
    • Journal Title

      The Astronomical Journal

      Volume: 158 Issue: 6 Pages: 236-236

    • DOI

      10.3847/1538-3881/ab5058

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An optical search for transients lasting a few seconds2019

    • Author(s)
      Michael W. Richmond, Masaomi Tanaka, Tomoki Morokuma, Shigeyki Sako, Ryou Ohsawa, Noriaki Arima, Nozomu Tominaga, Mamoru Doi, et al.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 72 Issue: 1 Pages: 3-3

    • DOI

      10.1093/pasj/psz120

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A kilometre-sized Kuiper belt object discovered by stellar occultation using amateur telescopes2019

    • Author(s)
      Arimatsu K.、Tsumura K.、Usui F.、Shinnaka Y.、Ichikawa K.、Ootsubo T.、Kotani T.、Wada T.、Nagase K.、Watanabe J.
    • Journal Title

      Nature Astronomy

      Volume: 3 Issue: 4 Pages: 301-306

    • DOI

      10.1038/s41550-018-0685-8

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Luminosity function of faint sporadic meteors measured with a wide-field CMOS mosaic camera Tomo-e PM2019

    • Author(s)
      Ohsawa Ryou, Toshikazu Shigeyama (26/37) et al.
    • Journal Title

      Planetary and Space Science

      Volume: 165 Pages: 281-292

    • DOI

      10.1016/j.pss.2018.09.006

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] A kilometre-sized Kuiper belt object revealed by OASES stellar occultation observations2019

    • Author(s)
      Ko Arimatsu, Kohji Tsumura, Fumihiko Usui, Shinnaka Yoshiharu, Kohei Ichikawa, Takafumi Ootsubo, Takayuki Kotani, Takehiko Wada, Koichi Nagase, Jun-ichi Watanabe
    • Organizer
      Japan Geoscience Union Meeting 2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 動画観測が究明する太陽系外縁部の”影”2019

    • Author(s)
      有松 亘
    • Organizer
      第10回光赤外線天文学大学間連携ワークショップ
    • Related Report
      2019 Research-status Report
    • Invited
  • [Remarks] 冥王星の大気の崩壊が急速に進行している可能性を示唆 -星を隠す瞬間の観測によって初解明-

    • URL

      https://www.kyoto-u.ac.jp/ja/research-news/2020-06-15

    • Related Report
      2020 Annual Research Report
  • [Remarks] 太陽系外縁天体が星を隠す瞬間の高感度観測に成功 -トモエゴゼンが実現する太陽系の果ての究明-

    • URL

      http://www.kyoto-u.ac.jp/ja/research/research_results/2019/191127_1.html

    • Related Report
      2019 Research-status Report
  • [Remarks] 小型望遠鏡で捉えた太陽系最果てにある小天体の影

    • URL

      https://www.nao.ac.jp/news/science/2019/20190129-kbo.html

    • Related Report
      2018 Research-status Report
  • [Remarks] 太陽系の果てに極めて小さな始原天体を初めて発見

    • URL

      http://www.kyoto-u.ac.jp/ja/research/research_results/2018/190129_1.html

    • Related Report
      2018 Research-status Report

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

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