Statistical properties of superflares on solar-type stars based on 1-min cadence data

• 資料種別: 記事
• タイトル: Statistical properties of superflares on solar-type stars based on 1-min cadence data
• 著者・編者: Hiroyuki Maehara; Takuya Shibayama; Yuta Notsu
• 出版事項: 日本 : Springer science+business media
• 出版年月日等: 2015-04-29
• 出版年（W3CDTF）: 2015-04-29
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 67(59)
• 掲載巻: 67(59)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-015-0217-z; https://doi.org/10.1186/s40623-015-0217-z
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• 受理日（W3CDTF）: 2015-08-17T20:47:01+09:00
• 保存日（W3CDTF）: 2015-06-20
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• 要約等: We searched for superflares on solar-type stars using Kepler data with 1-min sampling in order to detect superflares with a short duration. We found 187 superflares on 23 solar-type stars whose bolometric energy ranges from the order of 10³² to 10³⁶ erg. Some superflares show multiple peaks with the peak separation of the order of 100 to 1, 000 s which is comparable to the periods of quasi-periodic pulsations in solar and stellar flares. Using these new data combined with the results from the data with 30-min sampling, we found that the occurrence frequency (dN/dE) of superflares as a function of flare energy (E) shows the power-law distribution (dN/dE∞E ^-α ) with α∼-1.5 for 10³³<E<10³⁶ erg which is consistent with the previous results. The average occurrence rate of superflares with the energy of 10³³ erg which is equivalent to X100 solar flares is about once in 500 to 600 years. The upper limit of energy released by superflares is basically comparable to a fraction of the magnetic energy stored near starspots which is estimated from the photometry. We also found that the duration of superflares (τ) increases with the flare energy (E) as τ∞E ^{0.39 ± 0.03}. This can be explained if we assume the time scale of flares is determined by the Alfvén time.
• DOI: 10.1186/s40623-015-0217-z; https://doi.org/10.1186/s40623-015-0217-z; 10.48550/arxiv.1504.00074; https://doi.org/10.48550/arxiv.1504.00074
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © 2015 Maehara et al.; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
• 関連情報（URI）: http://hdl.handle.net/2433/212432; http://id.ndl.go.jp/digimeta/9483544; https://dl.ndl.go.jp/pid/9483544; http://link.springer.com/content/pdf/10.1186/s40623-015-0217-z.pdf; http://link.springer.com/article/10.1186/s40623-015-0217-z/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-015-0217-z
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