Enhancing the signal-to-noise ratio of solar-like targets

Details Enhancing the signal-to-noise ratio of solar-like targets Enhancing the signal-to-noise ratio of solar-like targets

2010-03-24

arxiv.org/abs/1003.4638v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Proceedings of the HELAS IV meeting. 4 pages and 5 figures.

Scientific paper

The analysis of the first solar-like targets done by CoRoT has shown that the oscillation amplitudes are about 25% below the theoretical amplitudes while the convective backgrounds are up to three times higher than in the solar case (Michel et al. 2008). In such conditions, the comb-like structure of the acoustic modes has smaller signal-to-noise ratios than initially expected complicating the characterization of individual modes. In the present work we apply the curvelet filtering to the solar-like targets already observed by CoRoT as well as a partial reconstruction of the signal from the obtained spacing of the comb-like structure of the acoustic modes. It enables us to enhance the signal-to-noise ratio of the ridges in the Echelle diagrams. Finally, we study how the analysis of the p modes can be improved.

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