Journal Article

A simple method to estimate radial velocity variations due to stellar activity using photometry*

S. Aigrain, F. Pont and S. Zucker

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 4, pages 3147-3158
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19960.x
A simple method to estimate radial velocity variations due to stellar activity using photometry*

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We present a new, simple method to predict activity-induced radial velocity (RV) variations using high-precision time series photometry. It is based on insights from a simple spot model, has only two free parameters (one of which can be estimated from the light curve) and does not require knowledge of the stellar rotation period. We test the method on simulated data and illustrate its performance by applying it to MOST/SOPHIE observations of the planet host star HD 189733, where it gives almost identical results to much more sophisticated but highly degenerate models, and synthetic data for the Sun, where we demonstrate that it can reproduce variations well below the m s−1 level. We also apply it to quarter 1 data for Kepler transit candidate host stars, where it can be used to estimate RV variations down to the 2–3 m s−1 level, and show that RV amplitudes above that level may be expected for approximately two-thirds of the candidates we examined.

Keywords: methods: data analysis; techniques: photometric; techniques: radial velocities; Sun: activity; planetary systems; stars: individual: HD 189733

Journal Article.  9030 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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