{
  "id": "1009.1173",
  "version": "v1",
  "published": "2010-09-06T22:51:57.000Z",
  "updated": "2010-09-06T22:51:57.000Z",
  "title": "Analysis of variability of TW Hya as observed by MOST and ASAS in 2009",
  "authors": [
    "Michal Siwak",
    "Slavek M. Rucinski",
    "Jaymie M. Matthews",
    "Grzegorz Pojmanski",
    "Rainer Kuschnig",
    "David B. Guenther",
    "Anthony F. J. Moffat",
    "Dimitar Sasselov",
    "Werner W. Weiss"
  ],
  "comment": "Accepted to MNRAS",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "As a continuation of our previous studies in 2007 and 2008, new photometric observations of the T Tauri star TW Hya obtained by the MOST satellite and the ASAS project over 40 days in 2009 with temporal resolution of 0.2 days are presented. A wavelet analysis of the combined MOST-ASAS data provides a rich picture of coherent, intermittent, variable-period oscillations, similarly as discovered in the 2008 data. The periods (1.3 - 10 days) and systematic period shortening on time scales of weeks can be interpreted within the model of magneto-rotationally controlled accretion processes in the inner accretion disk around the star. Within this model and depending on the assumed visibility of plasma parcels causing the oscillations, the observed shortest-period oscillation period may indicate the stellar rotation period of 1.3 or 2.6 d, synchronized with the disk at 4.5 or 7.1 solar radii, respectively.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-09-06T22:51:57.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "variability",
      "tauri star tw hya",
      "shortest-period oscillation period",
      "inner accretion disk",
      "stellar rotation period"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2010.17649.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2011,
      "month": "Feb",
      "volume": 410,
      "number": 4,
      "pages": 2725
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 868164,
      "adsabs": "2011MNRAS.410.2725S"
    }
  }
}