Solving the Mechanism of Magnetic Activity of Supeflare Stars based on the Analysis of White Light Solar Flares
Project/Area Number |
16H03955
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Astronomy
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Research Institution | Kyoto University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
野上 大作 京都大学, 理学研究科, 准教授 (20332728)
本田 敏志 兵庫県立大学, 自然・環境科学研究所, 准教授 (20425408)
前原 裕之 国立天文台, ハワイ観測所, 助教 (40456851)
浅井 歩 京都大学, 理学研究科, 准教授 (50390620)
一本 潔 京都大学, 理学研究科, 教授 (70193456)
磯部 洋明 京都市立芸術大学, 美術学部/美術研究科, 准教授 (90511254)
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Project Period (FY) |
2016-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2018: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2016: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
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Keywords | 太陽物理学 / 恒星物理学 / 光学赤外線天文学 / 超高層物理学 / 宇宙天気 / 宇宙科学 / 宇宙物理学 / 光赤外線天文学 / 超高層大気物理学 / 宇宙物理 |
Outline of Final Research Achievements |
Using the solar white light flare data taken with Hida Observatory SMART telescope and SDO satellite, it was found that the relationship (scaling law) between flare energy and duration for solar flares holds also for superflares on solar type stars. It was also found that magnetic field strength of solar type stars can be estimated from the scaling law between the Sun and solar type stars. We analyzed the time evolution of the large starspots of solar type superflare stars, by tracing the local minima of the light curves of the stars observed by Kepler space telescope. As a result, it was found that emergence and decay rates of star spots are mostly consistent with those expected from sunspots. We have performed spectroscopic observations of superflares of an M-type star, EV Lac, using the 2m Nayuta telescope at the Nishi-Harima Astronomical Observatory, and found the blue asymmetry of the H alpha line during superflares.
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Academic Significance and Societal Importance of the Research Achievements |
本研究によって、太陽型星のスーパーフレアはどのような黒点で発生するのか、太陽フレアとの違いはあるのか、について、基本的な知見が得られた。すなわち、太陽型星のスーパーフレアの発生メカニズムは太陽フレアのそれと共通であり、黒点のサイズの違いが主な違いであることが判明した。その結果、スーパーフレアが太陽で発生する可能性が、これまでより確からしくなったと言える。もし太陽でスーパーフレアが起きれば、地球環境や文明社会にとって壊滅的な大災害となることは間違いない。その意味で本研究の社会的意義は大きい。さらに本研究は、恒星の周辺の惑星の生命生存環境を解明するという観点からも、意義は大きい。
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Report
(4 results)
Research Products
(132 results)
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[Journal Article] Lifetimes and Emergence/Decay Rates of Star Spots on Solar-type Stars Estimated by Kepler Data in Comparison with Those of Sunspots2019
Author(s)
Namekata, Kosuke; Maehara, Hiroyuki; Notsu, Yuta; Toriumi, Shin; Hayakawa, Hisashi; Ikuta, Kai; Notsu, Shota; Honda, Satoshi; Nogami, Daisaku; Shibata, Kazunari
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Journal Title
The Astrophysical Journal
Volume: 871
Issue: 2
Pages: 187-187
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] The extreme space weather event in September 19092018
Author(s)
Hayakawa Hisashi、Ebihara Yusuke、Cliver Edward W、Hattori Kentaro、Toriumi Shin、Love Jeffrey J、Umemura Norio、Namekata Kosuke、Sakaue Takahito、Takahashi Takuya、Shibata Kazunari
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Journal Title
Monthly Notices of the Royal Astronomical Society
Volume: 484
Issue: 3
Pages: 4083-4099
DOI
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Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] A great space weather event in February 17302018
Author(s)
Hayakawa Hisashi、Ebihara Yusuke、Vaquero Jos? M.、Hattori Kentaro、Carrasco V?ctor M. S.、de la Cruz Gallego Mar?a、Hayakawa Satoshi、Watanabe Yoshikazu、Iwahashi Kiyomi、Tamazawa Harufumi、Kawamura Akito D.、Isobe Hiroaki
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Journal Title
Astronomy & Astrophysics
Volume: 616
Pages: A177-A177
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Satoshi Honda, Yuta Notsu, Kosuke Namekata, Shota Notsu, Time resolved spectroscopic observations of an M-dwarf flare star EV Lac during a flare2018
Author(s)
Satoshi Honda, Yuta Notsu, Kosuke Namekata, Shota Notsu, Hiroyuki Maehara, Kai Ikuta, Daisaku Nogami, Kazunari Shibata
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Journal Title
Publications of the Astronomical Society of Japan
Volume: -
Related Report
Peer Reviewed
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[Journal Article] Starspot activity and superflares on solar-type stars2017
Author(s)
Maehara, H., Notsu, Y., Notsu, S., Namekata, K., Honda, S., Ishii, T., T., Nogami, D., and Shibata, K.
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 印刷中
Issue: 3
Pages: 41-41
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Journal Article] Statistical Studies of Solar White-light Flares and Comparisons with Superflares on Solar-type Stars2017
Author(s)
Namekata, K., Sakaue, T., Watanabe, K., Asai, A., Maehara, H., Notsu, Y., Notsu, S., Honda, S., Ishii, T. T., Ikuta, K., Nogami, D., Shibata, K.
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Journal Title
The Astrophysical Journal
Volume: 851
Issue: 2
Pages: 91-91
DOI
Related Report
Peer Reviewed
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[Journal Article] The earliest drawings of datable auroras and a two-tail comet from the Syriac Chronicle of Zuqnin2017
Author(s)
Hayakawa, H., Y. Mitsuma, Y. Fujiwara, A. D. Kawamura, R. Kataoka, Y. Ebihara, S. Kosaka, K. Iwahashi, H. Tamazawa, and H. Isobe
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 69
Issue: 2
Pages: 1-13
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] “Dandelion” Filament Eruption and Coronal Waves Associated with a Solar Flare on 2011 February 162017
Author(s)
Cabezas, Denis P.; Martinez, Lurdes M.; Buleje, Yovanny J.; Ishitsuka, Mutsumi; Ishitsuka, Jose K.; Morita, Satoshi; Asai, Ayumi; UeNo, Satoru; Ishii, Takako T.; Kitai, Reizaburo; Takasao, Shinsuke; Yoshinaga, Yusuke; Otsuji, Kenichi; Shibata, Kazunari
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Journal Title
The Astrophysical Journal
Volume: 836
Issue: 1
Pages: 33-45
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Spectroscopic observations of active solar-analog stars with high X-ray luminosity, as a proxy of superflare stars2017
Author(s)
Notsu, Y., Honda, S., Maehara, H., Notsu, S., Namekata, K., Nogami, D., and Shibata, K.
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 69
Issue: 1
Pages: 12-12
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Journal Article] Temporal evolution and spatial distribution of white-light are kernels in a solar flare2016
Author(s)
Kawate, Tomoko, Ishii, Takako T., Nakatani, Yoshikazu, Ichimoto, Kiyoshi, Asai, Ayumi, Morita, Satoshi, Masuda, Satoshi
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Journal Title
The Astrophysical Journal
Volume: 833
Issue: 1
Pages: 50-57
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Presentation] 惑星トランジットを用いた、空間分解された恒星黒点の面積の時間変化の推定2019
Author(s)
行方宏介, James Davenport, Brett Morris, Suzanne Hawley, 前原裕之, 野津湧太, 野津翔太, 幾田佳, 野上作, 柴田一成, 本田敏志
Organizer
日本天文学会2019年春季年会
Related Report
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[Presentation] Increasing Small-scale Motions of the Filaments as the Precursors of their Eruptions2018
Author(s)
Seki, D., Otsuji, K., Isobe, H., Ishii, T. T., Ichimoto, K., Shibata, K.,
Organizer
JpGU2018
Related Report
Int'l Joint Research
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[Presentation] 恒星フレア影響の評価に向けた、太陽系外惑星データベースExoKyoto の整備2017
Author(s)
山敷庸亮, 黒木龍介, 佐藤啓明, 村嶋慶哉, 野津湧太, 前原裕之, 野津翔太, 佐々木貴教, 野上大作, 柴田一成, 他ExoKyoto開発チーム
Organizer
日本天文学会2017年秋季年会
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[Presentation] Time Resolved Spectroscopic Observations of an M-Dwarf Flare Star EV Lac During a Flare2016
Author(s)
Honda, Satoshi; Notsu, Yuta; Notsu, Shota; Maehara, Hiroyuki; Namekata, Kosuke; Nogami, Daisaku; Shibata, Kazunari
Organizer
The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Place of Presentation
Uppsala, Sweden
Year and Date
2016-06-06
Related Report
Int'l Joint Research
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[Presentation] Lithium Abundance Of The Solar-Type Superflare Stars2016
Author(s)
Honda, Satoshi; Notsu, Yuta; Maehara, Hiroyuki; Notsu, Shota; Shibayama, Takuya; Nogami, Daisaku; Shibata, Kazunari
Organizer
The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Place of Presentation
Uppsala, Sweden
Year and Date
2016-06-06
Related Report
Int'l Joint Research
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