Astrometric effects of solar-like magnetic activity in late-type stars and their relevance for the detection of extrasolar planets

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dc.creatorLanza, A. F.
dc.creatorDe Martino, C.
dc.creatorRodono', M.
dc.date2007-06-20
dc.date.accessioned2026-07-07T10:56:18Z
dc.date.available2026-07-07T10:56:18Z
dc.descriptionUsing a simple model based on the characteristics of sunspots and faculae in solar active regions, the effects of surface brightness inhomogeneities on the position of the photocentre of the disk of a solar-like, magnetically active star, are studied. A general law is introduced, giving the maximum amplitude of the photocentre excursion produced by a distribution of active regions with a given surface filling factor. The consequences for the detection of extrasolar planets by means of the astrometric method are investigated with some applications to forthcoming space missions, such as GAIA and SIM, as well as to ground-based interferometric measurements. Spurious detections of extrasolar planets can indeed be caused by activity-induced photocentre oscillations, requiring a simultaneous monitoring of the optical flux and a determination of the rotation period and of the level of activity of the target stars for an appropriate discrimination.
dc.description17 pages, 6 figures, accepted by New Astronomy
dc.identifierhttps://arxiv.org/abs/0706.2942
dc.identifierhttp://arxiv.org/abs/0706.2942
dc.identifierNewAstron.13:77-84,2008
dc.identifierdoi:10.1016/j.newast.2007.06.009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/186369
dc.subjectAstrophysics
dc.titleAstrometric effects of solar-like magnetic activity in late-type stars and their relevance for the detection of extrasolar planets
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