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

Borsa, F.; Scandariato, G.; Rainer, M.; Bignamini, A.; Maggio, A.; Poretti, E.; Lanza, A.F.; Di Mauro, M.P.; Benatti, S.; Biazzo, K.; Bonomo, A.S.; Damasso, M.; Esposito, M.; Gratton, R.; Affer, L.; Barbieri, M.; Boccato, C.; Claudi, R.U.; Cosentino, R.; Covino, E.; Desidera, S.; Fiorenzano, A.F.M.; Gandolfi, D.; Harutyunyan, A.; Maldonado, J.; Micela, G.; Molaro, P.; Molinari, E.; Pagano, I.; Pillitteri, I.; Piotto, G.; Shkolnik, E.; Silvotti, R.; Smareglia, R.; Southworth, J.; Sozzetti, A.; Stelzer, B.

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


Authors

F. Borsa

G. Scandariato

M. Rainer

A. Bignamini

A. Maggio

E. Poretti

A.F. Lanza

M.P. Di Mauro

S. Benatti

K. Biazzo

A.S. Bonomo

M. Damasso

M. Esposito

R. Gratton

L. Affer

M. Barbieri

C. Boccato

R.U. Claudi

R. Cosentino

E. Covino

S. Desidera

A.F.M. Fiorenzano

D. Gandolfi

A. Harutyunyan

J. Maldonado

G. Micela

P. Molaro

E. Molinari

I. Pagano

I. Pillitteri

G. Piotto

E. Shkolnik

R. Silvotti

R. Smareglia

A. Sozzetti

B. Stelzer



Abstract

Aims. We observed the t Boo system with the HARPS-N spectrograph to test a new observational strategy aimed at jointly studying asteroseismology, the planetary orbit, and star-planet magnetic interaction.

Methods. We collected high-cadence observations on 11 nearly consecutive nights and for each night averaged the raw FITS files using a dedicated software. In this way we obtained spectra with a high signal-to-noise ratio, used to study the variation of the Ca?II H&K lines and to have radial velocity values free from stellar oscillations, without losing the oscillations information. We developed a dedicated software to build a new custom mask that we used to refine the radial velocity determination with the HARPS-N pipeline and perform the spectroscopic analysis.

Results. We updated the planetary ephemeris and showed the acceleration caused by the stellar binary companion. Our results on the stellar activity variation suggest the presence of a high-latitude plage during the time span of our observations. The correlation between the chromospheric activity and the planetary orbital phase remains unclear. Solar-like oscillations are detected in the radial velocity time series: we estimated asteroseismic quantities and found that they agree well with theoretical predictions. Our stellar model yields an age of 0.9 ± 0.5 Gyr for t Boo and further constrains the value of the stellar mass to 1.38 ± 0.05 M?.

Acceptance Date Mar 24, 2015
Online Publication Date Jun 5, 2015
Publication Date 2015-06
Journal ASTRONOMY & ASTROPHYSICS
Print ISSN 0004-6361
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 578
Article Number A64
DOI https://doi.org/10.1051/0004-6361/201525741
Keywords stars: individual:tBoo, planetary systems, asteroseismology, techniques: spectroscopic, stars: activity
Publisher URL https://doi.org/10.1051/0004-6361/201525741

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