A method to extract p-modes frequencies from solar like stars acoustic spectra with S/N = 1/100

Details A method to extract p-modes frequencies from solar like stars acoustic spectra with S/N = 1/100 A method to extract p-modes frequencies from solar like stars acoustic spectra with S/N = 1/100

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..447r&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Astronomy and Astrophysics

Astrophysics

2

Stellar Oscillations, Solar-Like Stars

Scientific paper

The necessity of finding a signal buried in noise is a common problem in astrophysics where noise limited observations are usually preceding interesting discoveries. In particular we are interested in the detection of p-mode oscillation frequencies of solar-like stars which, at least for the moment, have a very poor S/N ratio. In this work, it is shown that to find this type of signals in time series observations with a S/N defined as σsignal/(σsignal+noise) as small as 0.0012 is indeed possible. The method uses the p-mode frequency signature in the asymptotic regime (n>>l) where the modes of like l are "almost" uniformly separated in frequency. The departure from an exact frequency spacing and the lowest signal's amplitude detected are trade off parameters.

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