日震学に基づく太陽モデルの構築と太陽ニュートリノ絶対強度の決定

• Project/Area Number: 12047208
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: 柴橋 博資 東京大学, 大学院・理学系研究科, 教授 (30126081)
• Co-Investigator(Kenkyū-buntansha): 斎尾 英行 東北大学, 大学院・理学系研究科, 教授 (10162174) ; 高田 将郎 東京大学, 大学院・理学系研究科, 助手 (20334245) ; 野本 憲一 東京大学, 大学院・理学系研究科, 教授 (90110676) ; 関井 隆 国立天文台, 太陽物理学研究系, 助教授 (20332158) ; 尾崎 洋二 長崎大学, 教養学部, 教授 (30011547) ; 鈴木 知治 東京大学, 大学院・理学系研究科, 助手 (20280935) ; 岩本 弘一 日本大学, 理工学部, 助手 (30318357)
• Project Period (FY): 2000 – 2003
• Project Status: Completed (Fiscal Year 2003)
• Budget Amount: ¥27,700,000 (Direct Cost: ¥27,700,000); Fiscal Year 2003: ¥4,400,000 (Direct Cost: ¥4,400,000); Fiscal Year 2002: ¥4,400,000 (Direct Cost: ¥4,400,000); Fiscal Year 2001: ¥6,900,000 (Direct Cost: ¥6,900,000); Fiscal Year 2000: ¥12,000,000 (Direct Cost: ¥12,000,000)
• Keywords: 日震学 / ニュートリノ / 太陽内部構造 / 太陽内部 / 太陽ニュートリノ / アクシオン / 核反応断面積

Research Abstract

1)日震学により明らかになった太陽内部の音速分布の標準的太陽モデルの音速分布との相対的差を比べると、自転角速度に著しい遷移が見られるタコクラインと呼ばれる中心からおよそ0.65太陽半径付近で顕著な鋭いピークを持つ。日震学に基づく音速分布と密度分布と対流層底の位置を制限条件として、観測データに忠実な太陽内部モデルを作成することにより、タコクラインでの水素分布を定量的に求め、タコクラインで水素分布は、拡散の結果水素が輻射層上部で内側に向けて減少する標準的太陽モデルよりも、内側に向けて弱くしか減少していないことを明らかにした。この傾向は、輻射吸収係数や、状態方程式といった物理素過程の不確定性によっても変わることはない。日震学太陽モデルの作成に当たり、密度分布が観測と矛盾しない重元素の分布を色々試したが、タコクラインでの水素分布の結果は大きく変わることはないことも示された。音速分布の観測誤差は極めて小さいため、この観測誤差による影響も極めて小さい。この結果、タコクラインでの音速の標準的太陽モデルと実際の太陽の差は、物質の混合過程の有無の差から生じたものであり、実際の太陽では、タコクラインにおいて、何らかの物質混合過程が起きていると結論が得られた。
2)最新のデータに基づいて決定した太陽内部音速分布と密度分布を高速条件として、日震学太陽モデルを構築した。そのモデルから予想されるニュートリノ・フラックスを諸量の不定性に基づく不定性も含めて計算し、実測値を比較した。サドバリューにおける実測値とスーパーカミオカンデの実測値を組合わせて、ニュートニノ振動を仮定して推測されるニュートリノ・フラックスは、この予想値と矛盾しない。また、アクシオンの存在を仮定して、同様のモデルを作り、ニュートリノ振動を仮定したニュートリノ・フラックスと矛盾しない条件から、アクシオンのパラメータに制限を加えた。

Research Products

• [Publications] Jeffey, C.S., Saio, H.: "Progeny of binary white dwarf merges"in White dwarfs, eds.D.de Martino et al., NATO Sci Ser II. 105. 53-56 (2003)
• [Publications] Kawabata, K.S., Deng, J., Wang, L., Mazzali, P.A., Nomoto, K: "On The Spectrum and Spectropolarimetry of Type Ic Hypernova SN 2003dh/GRB 030329"Astrophys.J.. 593. L19-L22 (2003)
• [Publications] Nomoto, K., Maeda, K., Umeda, H., Tominaga.N., Ohkubo, T., Deng, J., Mazzali, P.A.: "Population III Supernovae and their Nucleosynthesis"Mem.S.A.It.. 75. 312 (2004)
• [Publications] Saio, H., Gautschy, A: "The effect of a strong dipole magnetic field on axisymmetric p-mode oscillations"In Magnetic field in O, B and A stars : Origin and Connection to Pulsation, Rotation and Mass Loss, eds L.Balona et al., ASP conf Ser.. 305. 140-145 (2003)
• [Publications] Saio, H., Gautschy, A.: "Axisymmetric p-mode pulsations of stars with dipole magnetic fields"Monthly Not.Roy.Astron.Soc.. in press. (2004)
• [Publications] Sekii, T.: "Seismology of solar rotation"in New Developments in Astrophysical Field Dynamics, eds.M.J.Thompsons and J.Christensen-Dalsgaard(Cambrige University Press, Cambrige). 263 (2003)
• [Publications] Sekii, T.: "Seismology of solar internal rotation"in Highlight of Astronomy, Vol.13,ed.O.Engvold(the Astronomical Society of the Pacific, San Francisco). in press. (2004)
• [Publications] Sekii, T.: "SOT Local-Helioseismology Programme"in The Fifth Solar-B Science Meeting : The Solar-B Mission and the Forefront of Solar Physics, eds.T Sakursi & T.Sekii(Astron.Soc.Pacific, San Francisco). in press. (2004)
• [Publications] Sekii, T.Shibahashi, H: "On averaged time-distance autocorrelation diagrams"in SOHO12/GONE+2002:Local and Global Helioseismology : The present and Future, ed.H.Sawaya-Lacoste(ESP publication Division, Noordwijk). 389-392 (2003)
• [Publications] Sekii, T., Shibahashi, H., Kosovichev, A.G: "Autocorrelathion analysis of MDI high-frequency data"in SOHO12/GONE+2002:Local and Global Helioseismology : The present and Future, ed.H.Sawaya-Lacoste(ESP publication Division, Noordwijk). 385-388 (2003)
• [Publications] Shibahashi, H.: "Overview of the roAp phenomenin"In International Conference on magnetic fields in O, B and A stars, ed L.A.Balona, H.F.henrichs,& T.Medupe, ASP Conf.Ser. 305. 55-64 (2003)
• [Publications] Shibahashi, H., Kurtz, D., Kambe, E., Gough, D: "Line Profile Variations in γ Equ : A Puzzle"In Variable Stars in the Local Group, IAU Colloq.193,ed.D.W.Kurtz & K.Pollard(Astron.Soc.Pacific, San Fransisco). in press. (2004)
• [Publications] Shibahashi, H., Watanabe, S: "Constraint on particle physics from helioseismology"in SOHO12/GONE+2002:Local and Global Helioseismology : The present and Future, ed.H.Sawaya-Lacoste(ESA Publicathion Division, Noordwijk). 29-34 (2003)
• [Publications] Takata, M., Loffler, W.: "Application of the Riccati Method to the Adiabatic Oscillations of Stars"in Proc.IAU Celloq.193,Variable Stars in the Local Group, eds.D.W.Kurtz & K.Pollard(ASP Conf.Ser.,San Francisco). in press. (2004)
• [Publications] Takata, M., Shibahashi, H: "Hydrogen Abundance in the Tachocline Layer of the Sun"Publ.Astron.Soc.Japan. 55. 1015-1023 (2003)
• [Publications] Unno, W., Yuasa, Shibahashi, H: "Precipitayion diffusion model of solar-wind particles for sky brightness variation"in The Fifth Solar-B Science Meeting : The Solar-B Mission and the Forefront of Solar Physics, eds.T.Sakurai & T.sekii(Astron.Soc.Pacific, San Francisco). in press. (2004)
• [Publications] Appourchaux, T., Andersen, B., Sekii, T.: "What have we learnt with the lumi nosity oscillations imager over the past 6 years?"in SOHO 11 Workshop: From Solar Mm to Max: Half a Solar Cycle with SOHO, ed.A.Wilson (ESA Publication Division, Noordwijk). 47-50 (2002)
• [Publications] Gough, D.O., Sekii, T.: "On the effect of error correlation on linear inversion"Monthly Notices Roy.Astron.Soc.. 335. 170-176 (2002)
• [Publications] Jeffery, C.S., Sajo, H.: "Helium White Dwarf Mergers as Progeny for Extreme Helium Stars"ASP Conf.Ser.. 263. 239-251 (2002)
• [Publications] Paparo, M., Shibahashi, H., Sterken, C.: "Resonance effect of binary orbital motion upon δ Scuti type stars"ASP Conf.Ser.. 259. 94-95 (2002)
• [Publications] Saio, H.: "The effects of rapid rotation on pulsation"ASP Conf.Ser.. 259. 177-185 (2002)
• [Publications] Saio H., Gautschy, A.: "The effect of a strong dipole magnetic field on axisymmetric p-mode oscillations"ASP Conf.Ser.. 216(in press). (2003)
• [Publications] Saio, H., Jeffery, C.S.: "Herged binary white dwarf evolution: rapidly accreting carbon-oxygen white dwarfs and the progeny of extreme helium stars"Monthly Notices Roy.Astron.Soc.. 333. 121-132 (2002)
• [Publications] Sekii, T.: "Seismology of solar rotation"in New Developments in Astrophysical Fluid Dynamics, eds.M.J.Thompson and J.Christensen-Dalsgaard (Cambridge University Press, Cambridge). (in press). (2003)
• [Publications] Sekii, T., Shibahashi, H.: "On averaged time-distance autocorrelation diagrams"in SOHO12/GONG+ 2002 : Local and Global Helioseismology : The Present and Future, ed.H.Sawaya-Lacoste (ESA Publication Division, Noordwijk). (in press). (2003)
• [Publications] Sekii, T., Shibahashi, H.Kosovichev, A.G.: "Autocorrelation analysis of MDI high-frequency data"in SOHO12/GONG+ 2002: Local and Global Helioseismology : The Present and Future ed.H.Sawaya-Lacoste (ESA Publication Division, Noordwijk). (in press). (2003)
• [Publications] Shibahashi, H.: "Effect of close binary upon stellar pulsation"ASP Conf.Ser.. 259. 82-83 (2002)
• [Publications] 柴橋博資: "ニュートリノ・日震学・太陽モデル"プラズマ・核融合学会誌. 78. 497-507 (2002)
• [Publications] Shibahashi, H: "Solar structure and the neutrino problem"in New Developments in Astrophysical Fluid Dynamics, eds.M.J.Thompson & J.Cliristensen-Dalsgaard (Cambridge University Press, Cambridge). (in press). (2003)
• [Publications] Shibahashi, H., Koshikawa, T.: "Asteroseisinology of Beta Cephei : Influence of updated microphysics"ASP Conf.Ser.. 259. 208-209 (2002)
• [Publications] Shibahashi, H. Watanabe, S.: "Seismic constraint on the plausible explanations about the metal rich feature of planetary system stars"ASP Conf.Ser. 259. 486-489 (2002)
• [Publications] Shibahashi, H., Watanabe, S.: "Constraint on particle physics from helioseismology"in SOHO12/GONG+ 2002: Local and Global Helioseismology : The Present and Future, ed.H.Sawaya-Lacoste (ESA Publication Division, Noordwijk). (in press). (2003)
• [Publications] Takata, M., Gough, D.O.: "The seismic radius of the Sun, and the structure inversions"in SOHO12/GONG+ 2002: Local and Global Helioseismology : The Present and Future, ed.H.Sawaya-Lacoste (ESA Publication Division, Noordwijk). (in press). (2003)
• [Publications] Takata, M., Montgomery, M.H.: "Seismic inversions for white dwarf stars"ASP Conf.Ser.. 259. 606-607 (2002)
• [Publications] Unno, W., Shibahashi, H.: "The solar-cycle global warming as inferred from the sky brightness variation"in New Developments in Astrophystcal Fluid Dynamics, eds.M.J.Thompson & J.Christensen-Dalsgaard (Cambridge University Press, Cambridge). (in press). (2003)
• [Publications] Watanabe, S., Shibahashi, H.: "The most stringent limit on solar axions"in New Trends in Theoretical and Observational Cosmology. (in press). (2003)
• [Publications] Gough, D.O., Sekii, T.: "On the effect of error correlation on linear inversions"MNRAS. (in press). (2002)
• [Publications] Gough, D.O., Sekii, T., Toomre, J.: "Comparison of phase inversion and time-distance analysis of one-dimensional artificial seismic data"in SOHO10/GONG 2000 Workshop : Helio-and Asteroseismology at the Dawn of the Millennium, eds. P.Palle and A.Wilson (ESA Publication Division, Noordwijk). 207-208 (2001)
• [Publications] Paparo, M., Shibahashi, H., Sterken, C.: "Resonance effect of binary orbital motion upon δ Scuti type stars"in Radial and Nonradial Pulsations as Probes of Stellar Physics, IAU Colloq. 185, eds. C.Aerts, T.Bedding, & J.Christensen-Dalsgaard (Astron. Soc. Pacific, San Fransisco). (in press). (2002)
• [Publications] Sekii, T., Shibahashi, H., Kosovichev, A.G., Duvall, T.L., Jr., Bush, R., Sherrer, P.H.: "Local-area Helioseismology by SOT On-board Solar-B"in Proc. of SOHO 10/ GONG 2000 Workshop : Heilo-and Asteroseismology at the Dawn of the Millennium eds. P.Palle and A.Wilson (ESA Publication Division, Noordwijk). 327-330 (2001)
• [Publications] Shibahashi, H.: "Asteroseismology of Magnetic Stars"in Proc. of SOHO 10/ GONG 2000 Workshop : Heilo-and Asteroseismology at the Dawn of the Millennium eds. P.Palle and A.Wilson (ESA Publication Division, Noordwijk). 457-460 (2001)
• [Publications] Shibahashi, H.: "Effect of close binary upon stellar pulsation"in Radial and Nonradial Pulsations as Probes of Stellar Physics, IAU Colloq. 185, eds. C.Aerts, T.Bedding, & J.Christensen-Dalsgaard (Astron. Soc. Pacific, San Fransisco). (in press). (2002)
• [Publications] Appourchaux,T. et al.: "On measuring low-degree p-mode frequency splitting with full-disc integrated data"Monthly Notices Roy.Astron.Soc.. 319. 365-376 (2000)
• [Publications] Appourchaux,T. et al.: "Observational upper limits for low-degree solar g modes"Astrophys.J.. 538. 401-414 (2000)
• [Publications] Gough,D.O. et al.: "Phase Inversion of One-Dimensional Artificial Seismic Data"Solar Phys.. 195. 1-12 (2000)
• [Publications] Gough,D.O. et al.: "Comparison of phase inversion and time-distance analysis of one-dimensional artificial seismic data"in Proc.of SOHO 10/GONG 2000 Workshop : Helio- and Astero-seismology at the Dawn of the Millennium, eds.A.Wilson (ESA Publication Division, Noordwijk). (in press). (2001)
• [Publications] Sekii,T. et al.: "Local-area Helioseismology by SoT On-board Solar-B"in Proc.of SOHO 10/GONG 2000 Workshop : Helio- and Astero-seismology at the Dawn of the Millennium, eds.A.Wilson (ESA Publication Division, Noordwijk). (in press). (2001)
• [Publications] Shibahashi,H.: "Asteroseismology of Magnetic Stars"in Proc.of SOHO 10/GONG 2000 Workshop : Helio- and Astero-seismology at the Dawn of the Millennium, eds.A.Wilson (ESA Publication Division, Noordwijk). (in press). (2001)
• [Publications] Shibahashi,H. et al.: "Helioseismic Approach to the Solar Neutrino Problem and Neutrino Oscillations"in Neutrino Oscillations and their Origin, eds.Y.Suzuki,M.Nakahata,M.Shiozawa,& K.Kaneyuki (Universal Academy Press, Tokyo). 215-226 (2000)
• [Publications] Takata,M.,& Shibahashi,H.: "Solar Metal Abundance Inferred from Helioseismology"in Recent Insights into the Physics of the Sun and Heliosphere,-High-lights from SOHO and Other Space Missions-IAU Symp.No.203, eds.P.Brekke,B.Fleck,& J.B.Gurman (Astron.Soc.Pacific, San Fransisco). (in press). (2001)
• [Publications] Watanabe,S.,& Shibahashi,H.: "Low-Z Core Solar Models with Helioseismic Constraints and the Solar Neutrino Problem"in Proc.of SOHO 10/GONG 2000 Workshop : Helio- and Astero-seismology at the Dawn of the Millennium, eds.A.Wilson (ESA Publication Division, Noordwijk). (in press). (2001)