Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 410, Issue 4, Pages 2725-2729Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.17649.x
Keywords
accretion, accretion discs; stars: individual: TW Hya; stars: rotation
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Canadian Space Agency
- Austrian Space Agency
- Austrian Science Fund
- Austrian Science Fund (FWF) [P 22691] Funding Source: researchfish
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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 All Sky Automated Survey (ASAS) project over 40 d in 2009 with temporal resolution of 0.2 d 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 d) and systematic period shortening on time-scales of weeks can be interpreted within the model of magnetorotationally controlled accretion processes in the inner accretion disc around the star. Within this model and depending on the assumed visibility of plasma parcels causing the oscillations, the observed shortest oscillation period may indicate the stellar rotation period of 1.3 or 2.6 d, synchronized with the disc at 4.5 or 7.1 R-circle dot, respectively.
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