A magnetic cycle of tau Bootis? The coronal and chromospheric view

Abstract

Tau Bootis is a late F-type main sequence star orbited by a Hot Jupiter. During the last years spectropolarimetric observations led to the hypothesis that this star may host a global magnetic field that switches its polarity once per year, indicating a very short activity cycle of only one year duration. In our ongoing observational campaign, we have collected several X-ray observations with XMM-Newton and optical spectra with TRES/FLWO in Arizona to characterize tau Boo's corona and chromosphere over the course of the supposed one-year cycle. Contrary to the spectropolarimetric reconstructions, our observations do not show indications for a short activity cycle.

arXiv comment4 pages, 2 figures, appeared in Astronomical Notes 333, 1, 26-29 (2012)

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Cited by in corpus (13)

• The stellar wind cycles and planetary radio emission of the Tau Boo system
• Indications for an influence of Hot Jupiters on the rotation and activity of their host stars
• A small survey of the magnetic fields of planet-host stars
• The connection between stellar activity cycles and magnetic field topology
• The dependence of stellar mass and angular momentum losses on latitude and on active region and dipolar magnetic fields
• On the detectability of star-planet interaction
• The relation between stellar magnetic field geometry and chromospheric activity cycles II: The rapid 120 day magnetic cycle of Tau Bootis
• Temporal variability of the wind from the star τ Boötis
• X-ray activity cycle on the active ultra-fast rotator AB Dor A? Implication of correlated coronal and photometric variability
• Magnetic fields of Sun-like stars
• The excitation of planetary orbits by stellar jet variability and polarity reversal
• Planets spinning up their host stars: a twist on the age-activity relationship
• Far beyond the Sun: III. The magnetic cycle of $\mathbf{\iota }$ Horologii