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Mikkel Nørup Lund

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

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  • Mikkel N. Lund
  • William J. Chaplin, School of Physics and Astronomy, University of Birmingham, Edgbaston Birmingham, B15 2TT
  • ,
  • Hans Kjeldsen
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.
OriginalsprogEngelsk
TidsskriftRoyal Astronomical Society. Monthly Notices
Vol/bind427
Nummer2
Sider (fra-til)1784-1792
Antal sider10
ISSN0035-8711
DOI
StatusUdgivet - 1 dec. 2012

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