{
  "id": "2303.16051",
  "version": "v1",
  "published": "2023-03-28T15:33:30.000Z",
  "updated": "2023-03-28T15:33:30.000Z",
  "title": "The connection between starspots and superflares: a case study of two stars",
  "authors": [
    "Alexandre Araújo",
    "Adriana Valio"
  ],
  "comment": "5 pages,4 Figures",
  "doi": "10.1093/mnrasl/slad034",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP"
  ],
  "abstract": "How do the characteristics of starspots influence the triggering of stellar flares? Here we investigate the activity of two K-type stars, similar in every way from mass to rotation periods and planetary systems. Both stars exhibit about a hundred spots, however, Kepler-411 produced 65 superflares, while Kepler-210 presented none. The spots of both stars were characterized using the planetary transit mapping technique, which yields the intensity, temperature, and radius of starspots. The average radius was $(17\\pm7) \\times 10^3$ km and $(58 \\pm 23) \\times 10^3$ km, while the intensity ratio with respect to the photosphere was $(0.35\\pm0.24)$ $I_{c}$ and $(0.64\\pm0.15)$ $I_{c}$, and the temperature was $(3800 \\pm 700)$ K and $(4180 \\pm 240)$ K for spots of Kepler-411 and Kepler-210, respectively. Therefore, spots on the star with no superflares, Kepler-210, are mostly larger, less dark, and warmer than those on the flaring star, Kepler-411. This may indicate magnetic fields with smaller magnitude and complexity of the spots on Kepler-210 when compared to those on Kepler-411. Thus, starspot area appears not to be the main culprit of superflares triggering. Perhaps the magnetic complexity of active regions is more important.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-03-28T15:33:30.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "case study",
      "superflares",
      "connection",
      "starspot area appears",
      "planetary transit mapping technique"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}