Lund, Mikkel N.3; Chaplin, William J.2; Kjeldsen, Hans3
1 Department of Physics and Astronomy, Science and Technology, Aarhus University2 School of Physics and Astronomy, University of Birmingham, Edgbaston Birmingham, B15 2TT3 Department of Physics and Astronomy, Science and Technology, Aarhus University
We introduce a new method to detect solar-like oscillations in frequency power spectra of stellar observations, under conditions of very low signal to noise. The Moving-Windowed-Power-Search, or MWPS, searches the power spectrum for signatures of excess power, over and above slowly varying (in frequency) background contributions from stellar granulation and shot or instrumental noise. We adopt a false-alarm approach (Chaplin et al. 2011) to ascertain whether flagged excess power, which is consistent with the excess expected from solar-like oscillations, is hard to explain by chance alone (and hence a candidate detection). We apply the method to solar photometry data, whose quality was systematically degraded to test the performance of the MWPS at low signal-to-noise ratios. We also compare the performance of the MWPS against the frequently applied power-spectrum-of-power-spectrum (PSxPS) detection method. The MWPS is found to outperform the PSxPS method.
Royal Astronomical Society. Monthly Notices, 2012, Vol 427, Issue 2, p. 1784-1792