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http://hdl.handle.net/20.500.12386/23111
Titolo: | The GAPS programme with HARPS-N at TNG. VII. Putting exoplanets in the stellar context: magnetic activity and asteroseismology of <ASTROBJ>τ Bootis A</ASTROBJ> | Autori: | BORSA, Francesco SCANDARIATO, GAETANO RAINER, Monica BIGNAMINI, ANDREA MAGGIO, Antonio PORETTI, Ennio LANZA, Antonino Francesco DI MAURO, Maria Giuseppina BENATTI, SERENA BIAZZO, Katia BONOMO, ALDO STEFANO Damasso, Mario Esposito, M. GRATTON, Raffaele AFFER, Laura Barbieri, M. BOCCATO, Caterina CLAUDI, Riccardo Cosentino, R. COVINO, Elvira DESIDERA, Silvano Fiorenzano, A. F. M. Gandolfi, D. Harutyunyan, A. MALDONADO PRADO, Jesus MICELA, Giuseppina MOLARO, Paolo MOLINARI, Emilio Carlo PAGANO, Isabella PILLITTERI, Ignazio Francesco Piotto, G. Shkolnik, E. SILVOTTI, Roberto SMAREGLIA, Riccardo Southworth, J. SOZZETTI, Alessandro Stelzer, B. |
Data pubblicazione: | 2015 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 578 | Da pagina:: | A64 | Abstract: | <BR /> Aims: We observed the <ASTROBJ>τ Boo</ASTROBJ> 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. <BR /> 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. <BR /> 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 τ Boo and further constrains the value of the stellar mass to 1.38 ± 0.05 M<SUB>☉</SUB>. <P />Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundacion Galileo Galilei of the INAF at the Spanish Observatorio Roque de los Muchachos of the IAC in the frame of the program Global Architecture of the Planetary Systems (GAPS).Full Table 1 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/578/A64">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/578/A64</A> | Acknowledgments: | The GAPS project acknowledges support from INAF through the “Progetti Premiali” funding scheme of the Italian Ministry of Education, University, and Research. We thank the referee G. Walker for interesting and useful comments that helped improve the clarity of the paper. | URI: | http://hdl.handle.net/20.500.12386/23111 | URL: | https://www.aanda.org/articles/aa/abs/2015/06/aa25741-15/aa25741-15.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201525741 | Bibcode ADS: | 2015A&A...578A..64B | Fulltext: | open |
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