Observational study on time variation of angular momentum dissipation in star- and planet-formation processes

• Project/Area Number: 26800094
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan (2016); The University of Tokyo (2014-2015)
• Principal Investigator: Yasui Chikako 国立天文台, TMT推進室, 助教 (00583626)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 星・惑星形成 / 赤外線天文学 / 原始惑星系円盤

Outline of Final Research Achievements

Stars are formed from the gravitationally induced collapse of molecular gas. Although any small initial rotation of the star-forming cloud is enormously magnified by conservation of angular momentum during collapse, angular momentum dissipation mechanisms have not well established yet. We derived dominant processes in different evolutionary phases of protoplanetary disks with near-infrared high-resolution spectroscopy. As a result, time variation of dominant processes are suggested for the first time: gas ejection by stellar wind is effective in the early phase, while star-disk interaction and gas ejection by disk wind are then effective.

Research Products

• [Int'l Joint Research] University of Hawaii(米国)
• [Journal Article] A spatially-resolved study of initial mass function in the outer Galaxy (2017)
  • Author(s): Yasui, Chikako; Izumi, Natsuko; Saito, Masao; Kobayashi, Naoto
  • Journal Title: Formation and Evolution of Galaxy Outskirts, Proceedings of the International Astronomical Union, IAU Symposium Volume: 321 Issue: S321 Pages: 34-36
  • DOI: 10.1017/s174392131600942x
• [Journal Article] Star-formation efficiency in the outer Galaxy (2017)
  • Author(s): Izumi, Natsuko; Kobayashi, Naoto; Yasui, Chikako; Tokunaga, Alan T.; Saito, Masao; Hamano, Satoshi
  • Journal Title: ormation and Evolution of Galaxy Outskirts, Proceedings of the International Astronomical Union, IAU Symposium Volume: 321 Issue: S321 Pages: 31-33
  • DOI: 10.1017/s1743921316011285
• [Journal Article] Low-metallicity Young Clusters in the Outer Galaxy. II. Sh 2-208 (2016)
  • Author(s): Yasui, C., Kobayashi, N., Saito, M., & Izumi, N.
  • Journal Title: The Astronomical Journal Volume: 151 Issue: 5 Pages: 115-128
  • DOI: 10.3847/0004-6256/151/5/115
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Near Infrared Diffuse Interstellar Bands Toward the Cygnus OB2 Association (2016)
  • Author(s): Hamano, S., Kobayashi, N., Kondo, S., Sameshima, H., Nakanishi, K., Ikeda, Y., Yasui, C., Mizumoto, M., Matsunaga, N., Fukue, K., Yamamoto, R., Izumi, N., Mito, H., Nakaoka, T., Kawanishi, T., Kitano, A., Otsubo, S., Kinoshita, M., and Kawakita, H.
  • Journal Title: The Astrophysical Journal Volume: 821 Issue: 1 Pages: 42-53
  • DOI: 10.3847/0004-637x/821/1/42
  • Peer Reviewed
• [Journal Article] Cryogenic performance of high-efficiency germanium immersion grating (2016)
  • Author(s): 猿楽祐樹, 池田優二, 加地紗由美, 小林尚人, 助川隆, 新崎貴之, 近藤荘平, 中西賢之, 安井千香子, 河北秀世
  • Journal Title: Proceedings of the SPIE Volume: 9906 Pages: 990637-990637
  • DOI: 10.1117/12.2233626
• [Journal Article] High sensitivity, wide coverage, and high-resolution NIR non-cryogenic spectrograph, WINERED (2016)
  • Author(s): Ikeda et al. (with Kobayashi, Kondo, Matsunaga, Kawakita)
  • Journal Title: Proceedings of the SPIE Volume: 9908 Pages: 99085Z-99085Z
  • DOI: 10.1117/12.2230886
  • Acknowledgement Compliant
• [Journal Article] First high-efficiency and high-resolution (R=80,000) NIR spectroscopy with high-blazed Echelle grating: WINERED HIRES modes (2016)
  • Author(s): Otsubo et al. (with Kobayashi, Kondo, Matsunaga, Kawakita)
  • Journal Title: Proceedings of the SPIE Volume: 9908 Pages: 990879-990879
  • DOI: 10.1117/12.2233845
  • Acknowledgement Compliant
• [Journal Article] Low-metallicity Young Clusters in the Outer Galaxy. I. Sh 2-207 (2016)
  • Author(s): Yasui, C., Kobayashi, N., Tokunaga, A. T., Saito, M., & Izumi, N.
  • Journal Title: The Astronomical Journal Volume: 151 Issue: 3 Pages: 50-59
  • DOI: 10.3847/0004-6256/151/3/50
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Herbig Ae/Be Candidate Stars in the Innermost Galactic Disk: Quartet Cluster (2016)
  • Author(s): Yasui, C., Kobayashi, N., Hamano, S., Kondo, S., Izumi, N., Saito, M., & Tokunaga, A. T.
  • Journal Title: The Astrophysical Journal Volume: 817 Issue: 2 Pages: 181-192
  • DOI: 10.3847/0004-637x/817/2/181
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Impact of the initial disk mass function on the disk fraction (2015)
  • Author(s): Ohsawa, Ryou; Onaka, Takashi; Yasui, Chikako
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 6
  • DOI: 10.1093/pasj/psv094
  • Peer Reviewed / Open Access
• [Journal Article] Line-depth Ratios in H-band Spectra to Determine Effective Temperatures of G- and K-type Giants and Supergiants (2015)
  • Author(s): Fukue, Kei; Matsunaga, Noriyuki; Yamamoto, Ryo; Kondo, Sohei; Kobayashi, Naoto; Ikeda, Yuji; Hamano, Satoshi; Yasui, Chikako; Arasaki, Takayuki; Tsujimoto, Takuji; Bono, Giuseppe; Inno, Laura
  • Journal Title: The Astrophysical Journal Volume: 812 Issue: 1 Pages: 64-64
  • DOI: 10.1088/0004-637x/812/1/64
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Near-infrared Diffuse Interstellar Bands in 0.91-1.32μm (2015)
  • Author(s): Hamano Satoshi, Kobayashi Naoto, Kondo Sohei, Ikeda Yuji, Nakanishi Kenshi, Yasui Chikako, Mizumoto Misaki, Matsunaga Noriyuki, Fukue Kei, Mito Hiroyuki, Yamamoto Ryo, Izumi Natsuko, Nakaoka Tetsuya, Kawanishi Takafumi, Kitano Ayaka, Otsubo Shogo, Kinoshita Masaomi, Kobayashi Hitomi, Kawakita Hideyo
  • Journal Title: The Astrophysical Journal Volume: 800 Issue: 2 Pages: 137-153
  • DOI: 10.1088/0004-637x/800/2/137
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Discovery of Star Formation in the Extreme Outer Galaxy Possibly Induced by a High-velocity Cloud Impact (2014)
  • Author(s): Izumi, N., Kobayashi, N., Yasui, C., Tokunaga, A. T., Saito, M., and Hamano, S.
  • Journal Title: The Astrophysical Journal Volume: 795 Issue: 1 Pages: 66-74
  • DOI: 10.1088/0004-637x/795/1/66
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Rapid evolution of the innermost dust disc of protoplanetary discs surrounding intermediate-mass stars (2014)
  • Author(s): Yasui, Ch., Kobayashi, N., Tokunaga, A. T., and Saito, M.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 442 Issue: 3 Pages: 2543-2559
  • DOI: 10.1093/mnras/stu1013
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] ZnSe immersion grating in the short NIR region (2014)
  • Author(s): Ikeda, Y., Kobayashi, N., Kuzmenko, P., Little, S. L., Mirkarimi, P. B., Alameda, J. B., Kaji, S., Sarugaku, Y., Yasui, C., Kondo, S., Fukue, K., Kawakita, H.
  • Journal Title: Proceedings of the SPIE Volume: 9151 Pages: 915144-915144
  • DOI: 10.1117/12.2055378
• [Journal Article] The precise measurement of the attenuation coefficients of various IR optical materials applicable to immersion grating (2014)
  • Author(s): Sayumi Kaji, Yuki Sarugaku, Yuji Ikeda, Kenshi Nakanishi, Naoto Kobayashi, Sohei Kondo, Chikako Yasui
  • Journal Title: Proc. SPIE Volume: 9147 Pages: 914738-914738
  • DOI: 10.1117/12.2055644
• [Presentation] 低金属量下における初期質量関数の導出 I: Sh 2-127 (2017)
  • Author(s): 安井千香子
  • Organizer: 日本天文学会2017年春季年会
  • Place of Presentation: 九州大学（福岡県福岡市）
  • Year and Date: 2017-03-15
• [Presentation] WINERED HIGH-RESOLUTION NEAR-INFRARED SPECTROSCOPY OF YOUNG INTERMEDIATE-MASS STARS: INSIGHTS INTO EVOLUTION OF STAR-DISK INTERACTIONS (2016)
  • Author(s): 安井千香子
  • Organizer: 「近赤外線高分散分光観測で探る恒星物理」研究会
  • Place of Presentation: 東京大学（東京都文京区）
  • Year and Date: 2016-10-05
  • Int'l Joint Research
• [Presentation] The spatially-resolved study of initial mass function in the outer Galaxy (2016)
  • Author(s): Yasui, C.
  • Organizer: IAU Symposium No. 321: Formation and evolution of galaxy outskirts
  • Place of Presentation: スペイン、トレド
  • Year and Date: 2016-03-14
  • Int'l Joint Research
• [Presentation] Metallicity dependence of protoplanetary disk lifetime (2016)
  • Author(s): Yasui, C.
  • Organizer: Exoplanets and Disks: Their Formation and Diversity III
  • Place of Presentation: ホテル日航八重山（沖縄県石垣市）
  • Year and Date: 2016-02-21
  • Int'l Joint Research
• [Presentation] 銀河系外縁部における低金属量星生成領域 Sh 2-207 の近赤外深撮像 (2015)
  • Author(s): 安井千香子、小林尚人、泉奈都子、斎藤正雄、Alan T. Tokunaga
  • Organizer: 日本天文学会 2015年秋季年会
  • Place of Presentation: 甲南大学（兵庫県神戸市）
  • Year and Date: 2015-09-09
• [Presentation] Rapid evolution of the innermost dust disc of protoplanetary discs surrounding intermediate-mass stars (2015)
  • Author(s): Yasui, C.
  • Organizer: Disc Dynamics & Planet Formation
  • Place of Presentation: キプロス、ラルナカ
  • Year and Date: 2015-06-29
  • Int'l Joint Research
• [Presentation] Metallicity dependence of protoplanetary disk lifetime (2015)
  • Author(s): Yasui, C.
  • Organizer: The Formation of the Solar System II
  • Place of Presentation: ドイツ、ベルリン
  • Year and Date: 2015-06-02
  • Int'l Joint Research
• [Presentation] Rapid evolution of the innermost dust disc of protoplanetary disks surrounding intermediate-mass stars (2015)
  • Author(s): 安井千香子
  • Organizer: 平成２６年度 系外惑星大研究会
  • Place of Presentation: 東京大学（東京都）
  • Year and Date: 2015-03-02 – 2015-03-03
• [Presentation] 銀河スケールでの原始惑星系円盤の進化 (2015)
  • Author(s): 安井千香子
  • Organizer: 新学術領域「系外惑星」B01, B02班研究会「円盤から惑星・衛星へ: 形状と進化」
  • Place of Presentation: 東京工業大学（東京都）
  • Year and Date: 2015-02-16 – 2015-02-17
• [Presentation] 銀河系内縁部の星生成領域 Quartet における HAeBe 星候補:長い円盤寿命の可能性 (2014)
  • Author(s): 安井千香子、小林尚人, 濱野哲史, Alan T. Tokunaga, 齋藤 正雄
  • Organizer: 日本天文学会 2014 年秋季年会
  • Place of Presentation: 山形大学（山形県）
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] Rapid Evolution of the Innermost Dust Disk of Protoplanetary Disks Surrounding Intermediate-mass Stars (2014)
  • Author(s): Yasui, C., Kobayashi, N., Tokunaga, A. T., Saito. M.
  • Organizer: ESO Workshop “Herbig Ae/Be stars: The missing link in star formation”
  • Place of Presentation: ESO Vitacura Office（チリ、サンチアゴ）
  • Year and Date: 2014-04-07 – 2014-04-11