{
  "id": "2202.03006",
  "version": "v1",
  "published": "2022-02-07T08:51:25.000Z",
  "updated": "2022-02-07T08:51:25.000Z",
  "title": "Simultaneous Detection of Optical Flares of the Magnetically Active M Dwarf Wolf 359",
  "authors": [
    "Han-Tang Lin",
    "Wen-Ping Chen",
    "Jinzhong Liu",
    "Xuan Zhang",
    "Yu Zhang",
    "Andrew Wang",
    "Shiang-Yu Wang",
    "Matthew J. Lehner",
    "C. Y. Wen",
    "J. K. Guo",
    "Y. H. Chang",
    "M. H. Chang",
    "Anli Tsai",
    "Chia-Lung Lin",
    "C. Y. Hsu",
    "Wing Ip"
  ],
  "comment": "16 pages, 10 figures, 3 tables",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We present detections of stellar flares of Wolf\\,359, an M6.5 dwarf in the solar neighborhood (2.41~pc) known to be prone to flares due to surface magnetic activity. The observations were carried out from 2020 April 23 to 29 with a 1-m and a 0.5-m telescope separated by nearly 300~km in Xinjiang, China. In 27~hr of photometric monitoring, a total of 13 optical flares were detected, each with a total energy of $\\gtrsim 5 \\times 10^{29}$~erg. The measured event rate of about once every two hours is consistent with those reported previously in radio, X-ray and optical wavelengths for this star. One such flare, detected by both telescopes on 26 April, was an energetic event with a released energy of nearly $10^{33}$~erg. The two-telescope lightcurves of this major event sampled at different cadences and exposure timings enabled us to better estimate the intrinsic flare profile, which reached a peak of up to 1.6 times the stellar quiescent brightness, that otherwise would have been underestimated in the observed flare amplitudes of about $0.4$ and $0.8$, respectively, with single telescopes alone. The compromise between fast sampling so as to resolve a flare profile versus a longer integration time for higher photometric signal-to-noise provides a useful guidance in the experimental design of future flare observations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-02-07T08:51:25.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "optical flares",
      "dwarf wolf",
      "simultaneous detection",
      "magnetically active",
      "surface magnetic activity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}