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.

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

References in corpus (4)

• Magnetic cycles of the planet-hosting star tauBootis
• Discovery of a 1.6-year Magnetic Activity Cycle in the Exoplanet Host Star iota Horologii
• The magnetic field of the planet-hosting star $\tau$ Bootis
• Parent Stars of Extrasolar Planets. VIII. Chemical Abundances for 18 Elements in 31 Stars

Cited by in corpus (4)

• Indications for an influence of Hot Jupiters on the rotation and activity of their host stars
• The connection between stellar activity cycles and magnetic field topology
• The excitation of planetary orbits by stellar jet variability and polarity reversal
• Far beyond the Sun: III. The magnetic cycle of $\mathbf{\iota }$ Horologii