J/A+A/495/959 Radial velocity curve of HD 189733 (Boisse+, 2009)
Stellar activity of planetary host star HD 189733.
Boisse I., Moutou C., Vidal-Madjar A., Bouchy F., Pont F., Hebrard G.,
Bonfils X., Croll B., Delfosse X., Desort M., Forveille T., Lagrange A.-M.,
Loeillet B., Lovis C., Matthews J.M., Mayor M., Pepe F., Perrier C.,
Queloz D., Rowe J.F., Santos N.C., Segransan D., Udry S.
<Astron. Astrophys. 495, 959 (2009)>
=2009A&A...495..959B 2009A&A...495..959B
ADC_Keywords: Stars, late-type; Planets ; Radial velocities
Keywords: techniques: radial velocities - stars: planetary system -
stars: individual: HD 189733 - stars: activity
Abstract:
Extra-solar planet search programs require high-precision velocity
measurements. They need to study how to disentangle radial-velocity
variations due to Doppler motion from the noise induced by stellar
activity. We monitored the active K2V star HD 189733 and its
transiting planetary companion that has a 2.2-day orbital period. We
used the high-resolution spectrograph SOPHIE mounted on the 1.93-m
telescope at the Observatoire de Haute-Provence to obtain 55 spectra
of HD 189733 over nearly two months. We refined the HD 189733b orbit
parameters and put limits on the eccentricity and on a long-term
velocity gradient. After subtracting the orbital motion of the
planet, we compared the variability of spectroscopic activity indices
to the evolution of the radial-velocity residuals and the shape of
spectral lines. The radial velocity, the spectral-line profile and the
activity indices measured in HeI (5875.62Å), Halpha (6562.81Å)
and the CaII H&K lines (3968.47Å and 393 3.66Å) show a
periodicity around the stellar rotation period and the correlations
between them are consistent with a spotted stellar surface in
rotation. We used such correlations to correct for the radial-velocity
jitter due to stellar activity. This results in achieving high
precision on the orbit parameters, with a semi-amplitude
K=200.56±0.88m/s and a derived planet mass of
MP=1.13±0.03M{Jup}.
Description:
Radial velocity measurements of HD 189733. Measurements with too low
signal to noise ratio, made during the transit of the planetary HD
189733b and those polluted by the Moon are removed. The error on
radial velocity is a quadratical sum of the photon-noise error, the
uncertainty on the wavelength calibration and an estimation of the
SOPHIE current systematics.
Objects:
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RA (2000) DE Designation(s)
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20 00 43.7 +22 42 39 HD 189733 = V* V452 Vul
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 29 33 Radial velocity measurements of HD 189733
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See also:
J/A+A/476/1347 : HST/ACS flux time series for HD 189733 (Pont+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d BJD Barycentric Julian Date
15- 21 F7.4 km/s HRV Heliocentric radial velocity
24- 29 F6.4 km/s e_HRV Error on radial velocity
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Acknowledgements:
Isabelle Boisse, iboisse(at)iap.fr
(End) Patricia Vannier [CDS] 18-Oct-2008