深部対流を考慮した系外ガス惑星表層大気運動形態の多様性の研究

• Project Area: New Frontiers of Extrasolar Planets: Exploring Terrestrial Planets
• Project/Area Number: 24103505
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: 竹広 真一 京都大学, 数理解析研究所, 准教授 (30274426)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 同期回転惑星 / ガス惑星 / 大気循環 / 系外惑星 / 非弾性系

Research Abstract

平成 25 年度は, より現実的な系外惑星大気計算を行うために, 平成 24 年度中に構築した 3 次元非弾性系ガス惑星大気モデルに簡略化した放射過程を導入した. 放射過程は入射短波放射と長波放射の 2 バンドからなり, それぞれの光学的厚さを圧力のべき関数で与える方法を採用した.
構築したモデルの正当性をチェックするために, これまでに行われて来ている浅い大気運動を仮定したモデルによる同期回転ガス惑星の表層大気運動の数値計算(Showman et al. Astrophys. J. 699 (2009) 564--584)との比較計算を行った. 大気計算領域の厚さを 0.01hPa から 1hPa の領域に設定し, 同期回転惑星 HD209458B の物理パラメターを与えて定常解を求めた. その結果, 温度の振幅が幾分小さいにもかかわらず, 得られた惑星表層の循環は浅いモデルによる計算と整合的なものであった. この結果に基づいて, 次第に大気計算領域を 100hPa および 10000hPa の深部にまで広げて同様の計算を行ったところ, 引き起こされる循環は主に表層に集中しており, その構造は大気下端境界を変更しても影響を受けなかった. その一方で, 振幅の弱い循環が大気深部に存在していることが見出された. この深部循環がどのような仕組みで引き起こされているのかは今後の検討課題である.

Current Status of Research Progress

Reason

25年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

25年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] A spherical shell numerical dynamo benchmark with pseudo-vacuum magnetic boundary conditions (2014)
  • Author(s): Jackson, A., Sheyko,A., Marti, P., Tilgner, A., Cebron, D., Vantieghem, S., Simitev, R., Busse, F., Zhan, X., Schubert, G., Takehiro, S., Sasaki, Y., Hayashi, Y.-Y., Ribeiro, A., Nore, C., Guermond, J.-L.
  • Journal Title: Geophysical Journal International Volume: 196 Issue: 2 Pages: 712-723
  • DOI: 10.1093/gji/ggt425
  • Peer Reviewed
• [Journal Article] Full sphere hydrodynamic and dynamo benchmarks (2014)
  • Author(s): Marti, P., Schaeffer, N., Hollerbach, R., Cebron, D., Nore, C., Luddens, F., Guermond, J.-L., Aubert, J., Takehiro, S., Sasaki, Y., Hayashi, Y.-Y., Simitev, R., Busse, F., Vantieghem, S., Jackson, A.
  • Journal Title: Geophysical Journal International Volume: 197 Issue: 1 Pages: 119-134
  • DOI: 10.1093/gji/ggt518
  • Peer Reviewed
• [Journal Article] Stability and bifurcation diagram of Boussinesq thermal convection in a moderately rotating spherical shell allowing rotation of the inner sphere (2013)
  • Author(s): Kimura, K., Takehiro, S., Yamada, M.
  • Journal Title: Phys. Fluids Volume: 25 Issue: 8
  • DOI: 10.1063/1.4819140
  • Peer Reviewed
• [Journal Article] Effects of latitudinally heterogeneous buoyancy flux conditions at the inner boundary on MHD dynamo in a rotating spherical shell (2013)
  • Author(s): Sasaki, Y., Takehiro, S., Nishizawa, S., Hayashi, Y.-Y.
  • Journal Title: Phys. Earth Planet. Inter. Volume: 223 Pages: 55-61
  • DOI: 10.1016/j.pepi.2013.07.003
  • Peer Reviewed
• [Journal Article] Weak interaction between zonal jets on a beta plane (2013)
  • Author(s): K.Obuse, S.Takehiro and M.Yamada
  • Journal Title: Japan Industrial and Applied Mathematics Volume: 30 Issue: 1 Pages: 111-127
  • DOI: 10.1007/s13160-012-0086-9
  • Peer Reviewed
• [Journal Article] Gtool development group Gtool5 : a Fortran90 library of input/output interfaces for self-descriptive multi-dimensional (2012)
  • Author(s): Ishiwatari M., Toyoda E., Morikawa Y., Takehiro S., Sasaki Y., Nishizawa S., Odaka M., Otobe N., Takahashi Y. O., Nakajima K., Horinouchi T., Shiotani M., Hayashi Y. -Y
  • Journal Title: numerical data. Geosci. Model Dev Volume: 5 Issue: 2 Pages: 449-455
  • DOI: 10.5194/gmd-5-449-2012
  • Peer Reviewed
• [Journal Article] A note on the stability of inviscid zonal jet flows on a rotating sphere (2012)
  • Author(s): E.Sasaki, S.Takehiro and M.Yamada
  • Journal Title: J.Fluid Mech Volume: 710 Pages: 154-165
  • DOI: 10.1017/jfm.2012.356
  • Peer Reviewed
• [Journal Article] Torques on the inner and outer spheres induced by the Boussinesq thermal convection in a rotating spherical shell. (2012)
  • Author(s): Keiji Kimura
  • Journal Title: Journal Physiical Society of Japan Volume: 81 Issue: 8 Pages: 84401-84401
  • DOI: 10.1143/jpsj.81.084401
  • Peer Reviewed
• [Presentation] 地球流体電脳倶楽部 DCMODELプロジェクトと数値モデルを用いた惑星大気研究について (2013)
  • Author(s): 竹広 真一
  • Organizer: 平成 24 年度宇宙科学情報解析シンポジウム
  • Place of Presentation: JAXA 宇宙科学研究所
  • Year and Date: 2013-02-15
  • Invited
• [Presentation] Differential rotation and angular momentum transport caused by thermal convection in rotating spherical shells (2012)
  • Author(s): Takehiro, Shin-ichi
  • Organizer: Progress in physics of the sun and stars: a new era in helio- and asteroseismology
  • Place of Presentation: Hotel Prince Hakone
  • Year and Date: 2012-11-29
  • Invited
• [Presentation] 薄い回転球殻対流により引き起こされる表層の帯状流 (2012)
  • Author(s): 佐々木 洋平
  • Organizer: 日本惑星科学会 2012 年度秋季講演会
  • Place of Presentation: 神戸大学
  • Year and Date: 2012-10-25
• [Presentation] 階層的地球流体スペクトルモデル集 SPMODEL を用いた惑星磁場ダイナモ計算 (2012)
  • Author(s): 佐々木 洋平
  • Organizer: 第132回 SGEPSS 総会および講演会
  • Place of Presentation: 札幌コンベンションセンター
  • Year and Date: 2012-10-23
• [Presentation] Construction of Hierarchical Models for the Fluid Dynamics in Earth and Planetary Sciences : DCMODEL project (2012)
  • Author(s): Takehiro, Shin-ichi
  • Organizer: Inetrnational Conference on Simulation and Technology (JSST 2012)
  • Place of Presentation: 神戸大学
  • Year and Date: 2012-09-28
• [Presentation] Surface zonal flow induced by turbulent convection in rapidly rotating spherical shells (2012)
  • Author(s): Sasaki, Youhei
  • Organizer: Inetrnational Conference on Simulation and Technology (JSST 2012)
  • Place of Presentation: 神戸大学
  • Year and Date: 2012-09-28
• [Presentation] 薄い回転球殻対流により引き起こされる表層の帯状流 (2012)
  • Author(s): 佐々木 洋平
  • Organizer: 日本流体力学会年会 2012
  • Place of Presentation: 高知大学
  • Year and Date: 2012-09-16
• [Presentation] Effects of latitudinally heterogeneous buoyancy flux conditions at the inner boundary on MHD dynamos in a rotating spherical shell (2012)
  • Author(s): Sasaki, Youhei
  • Organizer: The 13th Symposium of SEDI(Study of the Earth's Deep Interior)
  • Place of Presentation: University of Leeds, UK
  • Year and Date: 2012-07-01
• [Presentation] Development of an anelastic convection model in rotating spherical shells for stars, gas and icy giant planets (2012)
  • Author(s): Sasaki, Youhei
  • Organizer: The 13th Symposium of SEDI(Study of the Earth's Deep Interior)
  • Place of Presentation: University of Leeds, United Kingdom
  • Year and Date: 2012-07-01
• [Presentation] Triaxial rotation of the inner and outer spheres driven by Boussinesq thermal convection in a rotating spherical shell (2012)
  • Author(s): Kimura, Keiji
  • Organizer: The 13th Symposium of SEDI(Study of the Earth's Deep Interior)
  • Place of Presentation: University of Leeds, United Kingdom
  • Year and Date: 2012-07-01
• [Presentation] 恒星・ガス惑星の深部大気対流モデルの構築 (2012)
  • Author(s): 佐々木 洋平
  • Organizer: 日本地球惑星科学連合 2012 年大会
  • Place of Presentation: 幕張メッセ国際会議場
  • Year and Date: 2012-05-22
• [Presentation] 恒星・ガス惑星・氷惑星内部を念頭においた非弾性球殻対流モデル
  • Author(s): 佐々木洋平
  • Organizer: 日本地球惑星科学連合 2013 年大会
  • Place of Presentation: 幕張メッセ国際会議場
• [Presentation] 回転球殻内の非弾性流体熱対流の線型安定性
  • Author(s): 佐々木洋平
  • Organizer: 2013 年日本流体力学会年会
  • Place of Presentation: 東京農工大学
• [Presentation] Diversity of atmospheric circulations of sycronized rotating Jovian type planets
  • Author(s): Shin-ichi Takehiro
  • Organizer: 5th Subaru International Conference: Exoplanets and Disks: Their Formation and Diversity II
  • Place of Presentation: Sheraton Kona Resort & Spa Keauhou Bay
• [Presentation] 木星型惑星の表面パターンと大気循環モデル
  • Author(s): 竹広真一
  • Organizer: 系外惑星大気ワークショップ2014/惑星大気研究会
  • Place of Presentation: 国立天文台三鷹
  • Invited