A new method to detect solar-like oscillations at very low S/N using statistical significance testing

作者：Lund Mikkel N^*; Chaplin William J; Kjeldsen Hans

来源：Monthly Notices of the Royal Astronomical Society, 2012, 427(2): 1784-1792.

DOI：10.1111/j.1365-2966.2012.22098.x

• methods: data analysis
• methods: statistical
• stars: oscillations
• stars: solar-type

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 ratio. The Moving-Windowed-Power-Search (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 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). %26lt;br%26gt;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 (PS. PS) detection method. The MWPS is found to outperform the PS. PS method.

• 出版日期2012-12