The second core formation and high-speed jet in the collapsing cloud

• Project/Area Number: 18740104
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: Kyoto University
• Principal Investigator: MACHIDA Masahiro Kyoto University, 大学院・理学研究科, 特定研究員(グローバルCOE) (10402786)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥2,310,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥210,000); Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2007: ¥700,000 (Direct Cost: ¥700,000); Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
• Keywords: 数値シミュレーション / 星形成 / 磁気流体 / 連星 / 数値計算 / 褐色矮星 / 星間磁場 / アウトフロー / 星間物質 / 星周円盤 / ジェット / 分子雲コア / 多層格子法

Research Abstract

数値シミュレーションにより分子雲コア中での星形成過程についての研究を行った。星はガス雲の中で重力収縮することによって誕生する。この研究では3次元磁気散逸多層格子法という手法を用いて、世界で初めて、分子雲から星が誕生するまでの直接計算を行った。研究の結果、星形成過程で現れる2つのコア(ファーストコア、セカンドコア)から異なる性質を持つガス流が現れることがわかった。また、分子雲コアの分裂と連星形成の条件についても解明した。

Research Products

• [Journal Article] Thermal effects of circumplanetary disc formation around proto-gas giant planets (2009)
  • Author(s): 町田正博
  • Journal Title: MNRAS 392 Pages: 514-524
  • Peer Reviewed
• [Journal Article] Thermal effects of circumplanetary disc formation around proto-gas giant planets (2009)
  • Author(s): 町田正博
  • Journal Title: Monthly Notices of the Royal Astronomical Society 392 Pages: 514-524
  • Peer Reviewed
• [Journal Article] Angular Momentum Accretion onto a Gas Giant Planet (2008)
  • Author(s): 町田正博、小久保英一郎、犬塚修一郎、松本倫明
  • Journal Title: The Astrophysical Journal 685 Pages: 1220-1236
  • Peer Reviewed
• [Journal Article] Magnetohydrodynamics of Population III Star Formation (2008)
  • Author(s): 町田正博、松本倫明、犬塚修一郎
  • Journal Title: The Astrophysical Journal 685 Pages: 690-704
  • Peer Reviewed
• [Journal Article] Binary Formation in Star-forming Clouds with Various Metallicities (2008)
  • Author(s): 町田正博
  • Journal Title: The Astrophysical Journal 682 Pages: 1-4
  • Peer Reviewed
• [Journal Article] The Effect of Poloidal Magnetic Field on Type I Planetary Migration (2008)
  • Author(s): 武藤恭之、町田正博、犬塚修一郎
  • Journal Title: The Astrophysical Journal 679 Pages: 813-826
  • Peer Reviewed
• [Journal Article] Conditions for the Formation of First-Star Binaries (2008)
  • Author(s): 町田正博、大向一行、松本倫明、犬塚修一郎
  • Journal Title: The Astrophysical Journal 677 Pages: 813-827
  • Peer Reviewed
• [Journal Article] Formation Scenario for Wide and Close Binary Systems (2008)
  • Author(s): 町田正博、富阪幸治、松本倫明、犬塚修一郎
  • Journal Title: The Astrophysical Journal 677 Pages: 327-347
  • Peer Reviewed
• [Journal Article] High- and Low-VelocityMagnetized Outflows in the Star Formation Process (2008)
  • Author(s): 町田正博、犬塚修一郎、松本倫明
  • Journal Title: The Astrophysical Journal 676 Pages: 1088-1108
  • Peer Reviewed
• [Journal Article] High-and Low-Velocity Magnetized Outflows in the Star Formation Process in a Gravitationally (2008)
  • Author(s): 町田正博
  • Journal Title: THE ASTROPHYSICAL JOURNAL 676 Pages: 1088-1108
  • Peer Reviewed
• [Journal Article] Formation Scenario for Wide and Close Binary Systems (2008)
  • Author(s): 町田正博
  • Journal Title: THE ASTROPHYSICAL JOURNAL 677 Pages: 327-347
  • Peer Reviewed
• [Journal Article] Conditions for the Formation of First-Star Binaries (2008)
  • Author(s): 町田正博
  • Journal Title: The Astrophysical Journal 677 Pages: 813-827
  • Peer Reviewed
• [Journal Article] The Effect of Poloidal Magnetic Field on Type I Planetary Migration : Significance of Magnetic Resonance (2008)
  • Author(s): 武藤恭之
  • Journal Title: The Astrophysical Journal 679 Pages: 813-826
  • Peer Reviewed
• [Journal Article] Magnetohydrodynamics of Population III Star Formation (2008)
  • Author(s): 町田正博
  • Journal Title: The Astrophysical Journal 685 Pages: 690-704
  • Peer Reviewed
• [Journal Article] Angular Momentum Accretion onto a Gas Giant Planet (2008)
  • Author(s): 町田正博
  • Journal Title: The Astrophysical Journal 685 Pages: 1220-1236
  • Peer Reviewed
• [Journal Article] Driving Mechanism of Jets and Outflows in Star Formation Process (2008)
  • Author(s): 町田正博
  • Journal Title: THE ASTROPHYSICAL JOURNAL 677 Pages: 813-827
  • Peer Reviewed
• [Journal Article] Magnetic Fields and Rotations of Protostars (2007)
  • Author(s): 町田正博、犬塚修一郎、松本倫明
  • Journal Title: The Astrophysical Journal 670 Pages: 1198-1213
  • Peer Reviewed
• [Journal Article] Magnetic Fields and Rotations of Protostars (2007)
  • Author(s): 町田正博
  • Journal Title: THE ASTROPHYSICAL JOURNAL 670 Pages: 1198-1213
  • Peer Reviewed
• [Journal Article] Outflows Driven by Giant Protoplanets (2006)
  • Author(s): 町田正博、犬塚修一郎、松本倫明
  • Journal Title: The Astrophysical Journal 649 Pages: 129-132
  • Peer Reviewed
• [Journal Article] Second Core Formation and High-Speed Jets: Resistive MHD Nested Grid Simulations (2006)
  • Author(s): 町田正博、犬塚修一郎、松本倫明
  • Journal Title: The Astrophysical Journal 647 Pages: 151-154
  • Peer Reviewed
• [Journal Article] The First Jets in the Universe : Protostellar Jets from the First Stars (2006)
  • Author(s): 町田正博、大向一行、松本倫明、犬塚修一郎
  • Journal Title: The Astrophysical Journal 647 Pages: 1-4
  • Peer Reviewed
• [Journal Article] Evolution of Rotating Molecular Cloud Core with Oblique Magnetic Field (2006)
  • Author(s): 町田正博、松本倫明、花輪知幸、富阪幸治
  • Journal Title: The Astrophysical Journal 645 Pages: 1227-1245
  • Peer Reviewed
• [Journal Article] Outflows Driven by Giant Protoplanets (2006)
  • Author(s): 町田正博
  • Journal Title: THE ASTROPHYSICAL JOURNAL 649 Pages: 129-132
• [Journal Article] Second Core Formation and High-Speed Jets : Resistive Magnetohydrodynamic Nested Grid Simulations (2006)
  • Author(s): 町田正博
  • Journal Title: THE ASTROPHYSICAL JOURNAL 647 Pages: 151-154
• [Journal Article] The First Jets in the Universe : Protostellar Jets from the First Stars (2006)
  • Author(s): 町田正博
  • Journal Title: THE ASTROPHYSICAL JOURNAL 647 Pages: 1-4
• [Journal Article] Evolution of Rotating Molecular Cloud Core with Oblique Magnetic Field (2006)
  • Author(s): 町田正博
  • Journal Title: THE ASTROPHYSICAL JOURNAL 645 Pages: 1227-1245
• [Presentation] 低質量分子雲コア中での褐色矮星の形成可能性 (2009)
  • Author(s): 町田正博
  • Organizer: 日本天文学会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-26
• [Presentation] 巨大ガス惑星と周惑星円盤の形成過程 (2008)
  • Author(s): 町田正博
  • Organizer: 日本天文学会
  • Place of Presentation: 岡山理科大学
  • Year and Date: 2008-09-11
• [Presentation] 異なる重元素量を持つガス雲中での星形成過程と連星頻度 (2008)
  • Author(s): 町田正博
  • Organizer: 日本天文学会
  • Place of Presentation: 国立オリンピック記念青少年総合センター
  • Year and Date: 2008-03-24
• [Presentation] 近接連星と遠隔連星の形成シナリオ (2007)
  • Author(s): 町田正博
  • Organizer: 日本天文学会
  • Place of Presentation: 岐阜大学
  • Year and Date: 2007-09-26
• [Presentation] 原始惑星系円盤中でのガス惑星の角運動量獲得過程 (2007)
  • Author(s): 町田正博
  • Organizer: 日本天文学会
  • Place of Presentation: 東海大学
  • Year and Date: 2007-03-28
• [Presentation] 星形成過程における分子流と光学ジェットの駆動メカニズム (2006)
  • Author(s): 町田正博
  • Organizer: 日本天文学会
  • Place of Presentation: 九州国際大学
  • Year and Date: 2006-09-21