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The impact of stellar jitter on the confirmation of transiting exoplanet candidates around Solar-like stars

Published online by Cambridge University Press:  01 May 2008

Brandon Tingley
Affiliation:
Institut d'Astronomie et d'AstrophysiqueUniversité Libre de BruxellesB-1050 Brussels, Belgium email: btingley@ulb.ac.be
Frank Grundahl
Affiliation:
Department of Physics and AstronomyUniversity of AarhusDK-8000 Aarhus C, Denmark email: fgj@phys.au.dk, hans@phys.au.dk
Hans Kjeldsen
Affiliation:
Department of Physics and AstronomyUniversity of AarhusDK-8000 Aarhus C, Denmark email: fgj@phys.au.dk, hans@phys.au.dk
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Abstract

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The radial velocity technique is commonly used to classify transiting exoplanet candidates. However, stars are intrinsically noisy in radial velocity. No good description of this noise has yet been proffered, although activity in general has been suggested as the source, making it impossible to evaluate its effect on signal detection. In this poster, we propose an activity-based model that incorporates both light and dark stellar spots, capable of producing both photometric and radial velocity time series. We demonstrate its consistency with both SOHO/VIRGO photometry and SOHO/GOLF radial velocities. We then use this model to establish lower and upper limits on the effects of intrinsic stellar noise on the metal lines used to follow up transit candidates, making use of Monte Carlo simulations. Based on these results, we can suggest an optimal observational sampling rate.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

References

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