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Aims. We observed the $\tau$ Boo system with the HARPS-N spectrograph to testa new observational strategy aimed at jointly studying asteroseismology, theplanetary orbit, and star-planet magnetic interaction. Methods. We collectedhigh-cadence observations on 11 nearly consecutive nights and for each nightaveraged the raw FITS files using a dedicated software. In this way we obtainedspectra with a high signal-to-noise ratio, used to study the variation of theCaII H&K lines and to have radial velocity values free from stellaroscillations, without losing the oscillations information. We developed adedicated software to build a new custom mask that we used to refine the radialvelocity determination with the HARPS-N pipeline and perform the spectroscopicanalysis. Results. We updated the planetary ephemeris and showed theacceleration caused by the stellar binary companion. Our results on the stellaractivity variation suggest the presence of a high-latitude plage during thetime span of our observations. The correlation between the chromosphericactivity and the planetary orbital phase remains unclear. Solar-likeoscillations are detected in the radial velocity time series: we estimatedasteroseismic quantities and found that they agree well with theoreticalpredictions. Our stellar model yields an age of $0.9\pm0.5$ Gyr for $\tau$ Booand further constrains the value of the stellar mass to $1.38\pm0.05$M$_\odot$.

The GAPS Programme with HARPS-N at TNG. VII. Putting exoplanets in the stellar context: magnetic activity and asteroseismology of $\tau$ Bootis A