Free Access
Volume 581, September 2015
Article Number L6
Number of page(s) 6
Section Letters
Published online 16 September 2015

Online material

Table 2

Sample list of all the radial velocities (RV) measured for KELT-6 with the HARPS-N spectrograph in the framework of the GAPS programme.

Table 3

New relative radial velocities of KELT-6 measured with the TRES spectrograph and used for the first time in this work.

thumbnail Fig. 4

Upper panel: time series of the log() chromospheric index as measured from HARPS-N spectra. Middle and lower panels: correlation analysis between the RV residuals, obtained by removing the Keplerian signal due to KELT-6 b from the original HARPS-N dataset, and two indicators of stellar activity derived from the HARPS-N spectra: the log() chromospheric index and the CCF bisector span. Over-plotted are the values of Spearman’s rank correlation coefficients, which show the absence of significant correlations and support the hypothesis that the origin of the observed RV long-term variations is Keplerian.

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© ESO, 2015

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