A stable quasi-periodic 4.18-d oscillation and mysterious occultations in the 2011 MOST light-curve of TW Hya

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dc.creator Siwak, Michal
dc.creator Rucinski, Slavek M.
dc.creator Matthews, Jaymie M.
dc.creator Guenther, David B.
dc.creator Kuschnig, Rainer
dc.creator Moffat, Anthony F. J.
dc.creator Rowe, Jason F.
dc.creator Sasselov, Dimitar
dc.creator Weiss, Werner W.
dc.date.accessioned 2018-04-10T18:46:35Z
dc.date.available 2018-04-10T18:46:35Z
dc.date.issued 2014-10-11
dc.identifier.issn 0035-8711
dc.identifier.uri http://library2.smu.ca/handle/01/27407
dc.description Publisher's Version/PDF
dc.description.abstract We present an analysis of the 2011 photometric observations of TW Hya by the MOST satellite; this is the fourth continuous series of this type. The large-scale light variations are dominated by a strong, quasi-periodic 4.18-d oscillation with superimposed, apparently chaotic flaring activity. The former is probably produced by stellar rotation with one large hotspot created by a stable accretion funnel, while the latter may be produced by small hotspots, created at moderate latitudes by unstable accretion tongues. A new, previously unnoticed feature is a series of semiperiodic, well-defined brightness dips of unknown nature, of which 19 were observed during 43 d of our nearly continuous observations. Re-analysis of the 2009 MOST light-curve revealed the presence of three similar dips. On the basis of recent theoretical results, we tentatively conclude that the dips may represent occultations of the small hotspots created by unstable accretion tongues by hypothetical optically thick clumps of dust. en_CA
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dc.description.provenance Made available in DSpace on 2018-04-10T18:46:35Z (GMT). No. of bitstreams: 1 Guenther_David_B_article_2014_c.pdf: 1032851 bytes, checksum: 799521f68b6190601c4452a34e508748 (MD5) Previous issue date: 2014-06-28 en
dc.language.iso en en_CA
dc.publisher Oxford University Press
dc.relation.uri https://dx.doi.org/10.1093/mnras/stu1304
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.subject.lcsh Accretion (Astrophysics)
dc.subject.lcsh Variable stars
dc.subject.lcsh T Tauri stars
dc.subject.lcsh Astronomical photometry
dc.title A stable quasi-periodic 4.18-d oscillation and mysterious occultations in the 2011 MOST light-curve of TW Hya en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Monthly Notices of the Royal Astronomical Society 444(1), 327-335. (2014) en_CA
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
 
Published Version: https://dx.doi.org/10.1093/mnras/stu1304
 
 

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