J/A+A/578/A64 Velocity curve of τ Boo A (Borsa+, 2015)
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.
<Astron. Astrophys. 578, A64 (2015)>
=2015A&A...578A..64B 2015A&A...578A..64B
ADC_Keywords: Stars, double and multiple ; Planets ; Spectroscopy ;
Radial velocities
Keywords: stars: individual: tau Boo - planetary systems - asteroseismology -
techniques: spectroscopic - stars: activity
Abstract:
We observed the tau Boo system with the HARPS-N spectrograph in order
to test a new observational strategy aimed to jointly study
asteroseismology, the planetary orbit and star-planet magnetic
interaction.
We collected high-cadence observations on 11 nearly consecutive
nights, and for each night averaged the raw FITS files using dedicated
software in order to obtain high S/N spectra to study the variation of
the CaII H&K lines and radial velocity values free from stellar
oscillations without losing this latter information. Specific software
was written to build a new custom mask used to refine the RV
determination with the HARPS-N pipeline and to perform the
spectroscopic analysis.
We updated the planetary ephemeris and proved the acceleration due to
the stellar binary companion. The study of stellar activity variation
suggests the presence of an 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
estimate asteroseismic quantities finding good agreement with
theoretical predictions. With the stellar model built we find for tau
Boo an age of 0.9±0.5Gyr, and could further constrain the value
of the stellar mass to 1.38±0.05M☉.
Description:
HARPS-N radial velocities of tau Boo.
Objects:
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RA (2000) DE Designation(s)
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13 47 15.74 +17 27 24.8 tau Boo A = GJ 527 A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 34 324 HARPS-N radial velocities of τ Boo
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See also:
J/A+A/554/A28 : Qatar-1 differential light curve (Covino+, 2013)
J/A+A/575/A111 : GAPS V: Global analysis of the XO-2 system (Damasso+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Time of observation (BJD-2450000)
13- 21 F9.2 m/s RV [-17089/-16128] Radial velocity
23- 26 F4.2 m/s e_RV [0.51/2.52] Radial velocity error
28- 34 F7.2 m/s BS [-167/-39] Bisector span
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Acknowledgements:
Francesco Borsa, francesco.borsa(at)brera.inaf.it
References:
Covino et al., Paper I 2013A&A...554A..28C 2013A&A...554A..28C, Cat. J/A+A/554/A28
Desidera et al., Paper II 2013A&A...554A..29D 2013A&A...554A..29D
Esposito et al., Paper III 2014A&A...564L..13E 2014A&A...564L..13E
Desidera et al., Paper IV 2014A&A...567L...6D 2014A&A...567L...6D
Damasso et al., Paper V 2015A&A...575A.111D 2015A&A...575A.111D, Cat. J/A+A/575/A111
Sozzetti et al., Paper VI 2015A&A...575L..15S 2015A&A...575L..15S
(End) Francesco Borsa [INAF-OA Brera, Italy], Patricia Vannier [CDS] 31-Mar-2015