{
  "id": "1601.01132",
  "version": "v1",
  "published": "2016-01-06T10:36:43.000Z",
  "updated": "2016-01-06T10:36:43.000Z",
  "title": "Statistical properties of superflares on solar-type stars based on the Kepler 1-min cadence data",
  "authors": [
    "Hiroyuki Maehara",
    "Takuya Shibayama",
    "Yuta Notsu",
    "Shota Notsu",
    "Satoshi Honda",
    "Daisaku Nogami",
    "Kazunari Shibata"
  ],
  "comment": "6 pages, 4 figures, submitted to the proceedings of the IAU Symposium 320 \"Solar and Stellar Flares and Their Effects on Planets\" (eds. A. G. Kosovichev, S. L. Hawley, P. Heinzel)",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We searched for superflares on solar-type stars using the Kepler short-cadence (1-min sampling) data in order to detect superflares with short duration. We found 187 superflares on 23 solar-type stars whose bolometric energy ranges from the order of $10^{32}$ erg to $10^{36}$ erg. Using these new data combined with the results from the data with 30-min sampling, we found the occurrence frequency ($dN/dE$) of superflares as a function of flare energy ($E$) shows the power-law distribution ($dN/dE \\propto E ^{-\\alpha}$) with $\\alpha=1.5$ for $10^{33}<E<10^{36}$ erg. 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 amplitude of brightness variations. We also found that the duration of superflares ($\\tau$) increases with the flare energy ($E$) as $\\tau \\propto E^{0.39\\pm 0.03}$. This can be explained if we assume the time-scale of flares is determined by the Alfv$\\acute{\\rm e}$n time.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-01-06T10:36:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "solar-type stars",
      "cadence data",
      "statistical properties",
      "flare energy",
      "bolometric energy ranges"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2016arXiv160101132M"
    }
  }
}