I. Boisse, X. Bonfils, N. C. Santos
We define and put at disposal SOAP, Spot Oscillation And Planet, a software tool that simulates the effect of stellar spots and plages on radial velocimetry and photometry. This paper describes the tool release and provides instructions for its use. We present detailed tests to assess its performance and to validate the suitability of the code with previous computations and real data. We characterize the variations of the radial velocity, line bisector, and photometric amplitude as a function of the main variables: projected stellar rotational velocity, filling factor of the spot, resolution of the spectrograph, linear limb-darkening coefficient, latitude of the spot, and inclination of the star. Finally, we model the spot distributions on the active stars HD166435, TW Hya and HD189733 that reproduces the observations. We show that the software is remarkably fast allowing several evolutions in its capabilities that could be done to study the next challenges in the exoplanetary field connected with the stellar variability.
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http://arxiv.org/abs/1206.5493
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