Observational study of protoplanetary disk dispersal mechanism using metallicity dependence

• Project/Area Number: 22840046
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: YASUI Chikako 国立天文台, ALMA推進室, 研究員 (00583626)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,081,000 (Direct Cost: ¥2,370,000、Indirect Cost: ¥711,000); Fiscal Year 2011: ¥1,469,000 (Direct Cost: ¥1,130,000、Indirect Cost: ¥339,000); Fiscal Year 2010: ¥1,612,000 (Direct Cost: ¥1,240,000、Indirect Cost: ¥372,000)
• Keywords: 星・惑星形成 / 赤外線天文学 / 電波天文学 / 星惑星形成

Research Abstract

It is essential to clarify the mechanism of protoplanetary disk dispersal for understanding planet formation processes. We observed star-forming regions in higher and lower metallicity environments with Subaru 8.2m telescope and found the metallicity dependence of disk lifetime : the longer lifetime in higher metallicity environments. Our results suggest that photoevaporation by FUV and/or X-ray is one of the most dominant mechanism in disk dispersal process. We also quantitatively estimated disk lifetime of intermediate-mass stars for the first time and found that the lifetime is about half of that for low-mass stars and that the innermost disk disappears in very short timescale while entire disk disappears almost simultaneously for low-mass stars.

Research Products

• [Journal Article] Deep CO Observations and the CO-to-H2 Conversion Factor in DDO 154 a Low Metallicity Dwarf Irregular Galaxy (2011)
  • Author(s): 小麦真也、安井千香子, 他
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63巻、1号
  • Peer Reviewed
• [Journal Article] Deep CO Observations and the CO-to-H2 Conversion Factor in DDO 154, a Low Metallicity Dwarf Irregular Galaxy (2011)
  • Author(s): Komugi, Shinya ; Yasui, Chikako, 他
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63
  • Peer Reviewed
• [Journal Article] Short Lifetime of Protoplanetary Disks in Low-metallicity Environments (2010)
  • Author(s): 安井千香子、小林尚人、Alan T. Tokunaga、齋藤正雄、東谷千比呂
  • Journal Title: The Astrophysical Journal Letters Volume: 723巻、1号 Issue: 1 Pages: L113-L116
  • DOI: 10.1088/2041-8205/723/1/l113
  • URL: http://adsabs.harvard.edu/abs/2011PASJ.63L.1K
  • Peer Reviewed
• [Journal Article] Fabricationand current optical performance of a largediamond-machined ZnSe immersion grating (2010)
  • Author(s): Yuji Ikeda, Naoto Kobayashi, Paul J. Kuzmenko, Steve L. Little, Chikako Yasui, Sohei Kondo, Hiroyuki Mito, Kenshi Nakanishi, and Yuki Sarugaku
  • Journal Title: Proc. SPIE Volume: 7739 Pages: 77394G-77394G
  • DOI: 10.1117/12.856631
• [Journal Article] Short Lifetime of Protoplanetary Disks in Low-metallicity Environments (2010)
  • Author(s): Yasui, C., Kobayashi, N., 他
  • Journal Title: The Astrophysical Journal Volume: 723
  • Peer Reviewed
• [Journal Article] Fabrication and current optical performance of a large diamond-machined ZnSe immersion grating (2010)
  • Author(s): Ikeda, Y., Kobayashi, N., Kuzmenko, P.J., Little, S.L., Yasui, C., 他
  • Journal Title: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series Volume: 7739
• [Presentation] 中質量星における原始惑星系円盤の寿命 (2012)
  • Author(s): 安井千香子
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 龍谷大学(京都府)
  • Year and Date: 2012-03-12
• [Presentation] The Lifetime of Protoplanetary Disks Surrounding Intermediate-mass stars (2012)
  • Author(s): 安井千香子
  • Place of Presentation: Austin Convention Center(アメリカ合衆国、テキサス州オースティン)
  • Year and Date: 2012-01-12
• [Presentation] AOで探る、系外銀河における星生成 (2011)
  • Author(s): 安井千香子
  • Organizer: すばる望遠鏡次世代AOワークショップ
  • Place of Presentation: 大阪大学(大阪府)
  • Year and Date: 2011-09-09
• [Presentation] 低金属下における原始惑星系円盤の寿命 (2011)
  • Author(s): 安井千香子
  • Organizer: 日本地球惑星科学連合2011年度連合大会
  • Place of Presentation: 幕張メッセ国際会議場(千葉県)
  • Year and Date: 2011-05-24
• [Presentation] Fabrication and current optical performance of a large diamond-machined ZnSe immersion grating (2010)
  • Author(s): Ikeda, Y., Kobayashi, N., Kuzmenko, P.J., Little, S.L., Yasui, C., 他
  • Organizer: Society of Photo-Optical Instrumentation Engineers (SPIE)
  • Place of Presentation: San Diego, CA, United States
  • Year and Date: 2010-07-02
• [Remarks] 「NATIONAL GEOGRAPHIC」誌(December 2010)"Heart of the Milky Way"
  • URL: http://ngm.nationalgeographic.com/2010/12/milky-way/croswell-text/3
• [Remarks] 「ナショナルオグラフィック日本版」(2010年12月号,日経ナショナルオグラフィック社)"天の川の新事実"
  • URL: http://nng.nikkeibp.co.jp/nng/magazine/1012/feature02/
• [Remarks] 研究成果について、一般科学誌で紹介された。
• [Remarks] -「NATIONAL GEOGRAPHIC」誌(December 2010)"Heart of the Milky Way" (p.92-99)
  • URL: http://ngm.nationalgeographic.com/2010/12/milky-way/croswell-text/3
• [Remarks] -「ナショナルジオグラフィック日本版」(12月号,日経ナショナルジオグラフィック社)"天の川の真実"62頁
  • URL: http://nng.nikkeibp.co.jp/nng/magazine/1012/feature02/