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Stellar activity of planetary host star HD 189733

Published online by Cambridge University Press:  01 May 2008

I. Boisse
Affiliation:
Institut d'Astrophysique de Paris, CNRS UMR 7095-Université Pierre & Marie Curie, France
C. Moutou
Affiliation:
Laboratoire d'Astrophysique de Marseille, CNRS UMR 6110-Université de Provence, France
A. Vidal-Madjar
Affiliation:
Institut d'Astrophysique de Paris, CNRS UMR 7095-Université Pierre & Marie Curie, France
F. Bouchy
Affiliation:
Institut d'Astrophysique de Paris, CNRS UMR 7095-Université Pierre & Marie Curie, France
F. Pont
Affiliation:
School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, United Kingdom
G. Hébrard
Affiliation:
Institut d'Astrophysique de Paris, CNRS UMR 7095-Université Pierre & Marie Curie, France
X. Bonfils
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS UMR 5571-Université J. Fourier, France Centro de Astrofisica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
X. Delfosse
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS UMR 5571-Université J. Fourier, France
M. Desort
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS UMR 5571-Université J. Fourier, France
T. Forveille
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS UMR 5571-Université J. Fourier, France
A.-M. Lagrange
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS UMR 5571-Université J. Fourier, France
B. Loeillet
Affiliation:
Laboratoire d'Astrophysique de Marseille, CNRS UMR 6110-Université de Provence, France
C. Lovis
Affiliation:
Observatoire de Genève, Université de Genève, 1290 Sauverny, Switzerland
M. Mayor
Affiliation:
Observatoire de Genève, Université de Genève, 1290 Sauverny, Switzerland
F. Pepe
Affiliation:
Observatoire de Genève, Université de Genève, 1290 Sauverny, Switzerland
C. Perrier
Affiliation:
Laboratoire d'Astrophysique de Grenoble, CNRS UMR 5571-Université J. Fourier, France
D. Queloz
Affiliation:
Observatoire de Genève, Université de Genève, 1290 Sauverny, Switzerland
N. Santos
Affiliation:
Centro de Astrofisica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
D. Ségransan
Affiliation:
Observatoire de Genève, Université de Genève, 1290 Sauverny, Switzerland
S. Udry
Affiliation:
Observatoire de Genève, Université de Genève, 1290 Sauverny, Switzerland
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Abstract

Exoplanet search programs need to study how to disentangle radial-velocity (RV) variations due to Doppler motion and the noise induced by stellar activity. We monitored the active K2V HD 189733 with the high-resolution SOPHIE spectrograph (OHP, France). We refined the orbital parameters of HD 189733b and put limitations on the eccentricity and on a long-term velocity gradient. We subtracted the orbital motion of the planet and compared the variability of activity spectroscopic indices (HeI, Hα, Ca II H&K lines) to the evolution of the RV residuals and the shape of spectral lines. All are in agreement with an active stellar surface in rotation. We used such correlations to correct for the RV jitter due to stellar activity. This results in achieving a high precision on the orbital parameters, with a semi-amplitude: K=200.56±0.88ms−1 and a derived planet mass of MP=1.13±0.03 MJup.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

References

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