Detection of non-linear resonances among gravity modes of slowly pulsating B stars: Results from five iterative pre-whitening strategies

1 Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium e-mail: [email protected] 2 Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA 3 Reference Systems and Planetology, Royal Observatory of Belgium, Brussels, Belgium 4 Dept. of Astrophysics, IMAPP, Radboud University Nijmegen, 6500 GL Nijmegen, The Netherlands 5 Max Planck Institute for Astronomy, Koenigstuhl 17, 69117 Heidelberg, Germany