{
  "id": "1408.2988",
  "version": "v1",
  "published": "2014-08-13T12:10:29.000Z",
  "updated": "2014-08-13T12:10:29.000Z",
  "title": "A multiwavelength study of the hierarchical triple HD 181068: A test bed for studying star-planet-interaction?",
  "authors": [
    "S. Czesla",
    "K. F. Huber",
    "P. C. Schneider",
    "J. H. M. M. Schmitt"
  ],
  "comment": "Accepted for publication in A&A",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "HD 181068 is the only compact, triply eclipsing, hierarchical triple system containing a giant star known to date. With its central, highly-active G-type giant orbited by a close pair of main-sequence dwarfs, the system is ideal to study tidal interactions. We carried out a multiwavelength study to characterize the magnetic activity of the HD 181068 system. To this end, we obtained in- and out-of-eclipse X-ray snapshots with XMM-Newton and an optical spectrum, which we analyzed along with the Kepler light-curve. The primary giant shows strong quiescent X-ray emission at a level of 2e31 ergs, an S-index of 0.41 +/- 0.01, and marked white-light flares releasing up to 6e38 erg in the Kepler-band. During the second X-ray observation, we found a three-times elevated -- yet decaying -- level of X-ray emission, which might be due to an X-ray flare. The high level of magnetic activity is compatible with the previously reported absence of solar-like oscillations in the giant, whose atmosphere, however, undergoes tidally-induced oscillations imposed by the changing configuration of the dwarf-binary. We found that the driving force exciting these oscillations is comparable to the disturbances produced by a typical hot Jupiter, making the system a potential test bed to study the effects of tidal interactions also present in planetary systems.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-08-13T12:10:29.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hierarchical triple hd",
      "multiwavelength study",
      "studying star-planet-interaction",
      "strong quiescent x-ray emission"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201423879",
      "journal": "Astronomy and Astrophysics",
      "year": 2014,
      "month": "Oct",
      "volume": 570
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014A&A...570A.115C"
    }
  }
}