Acoustic spectrum fitting for a large set of solar-like pulsators

Othman Benomar, F. Baudin, W. J. Chaplin, Y. Elsworth, T. Appourchaux

    Research output: Contribution to journalArticle

    Abstract

    Asteroseismology provides the means both to constrain the global properties and to probe the internal structures of stars. Asteroseismic data are now available on large numbers of solar-type stars, thanks in particular to theCoRoTandKeplerspace missions, and automated data-analysis pipelines are needed to provide efficient and timely results. Here, we present an automated algorithm that is able to extract mode parameters under low signal-to-noise ratio conditions. We use a Bayesian framework to ensure the robustness of the algorithm. We discuss the efficiency of the method and test it using Variability of Solar Irradiance and Gravity Oscillations (VIRGO) Sun-as-a-star photometry data and the artificial Astero Fitting at Low Angular degree Group (asteroFLAG)Keplerensemble. Analysis of the VIRGO data shows that it is possible to track variations of the individual mode parameters (frequency, height, width) through the solar cycle, using short time series (30 days). The present analysis also revealed a modulation of the degreel= 2 relative height through the solar cycle. Applied on asteroFLAG data, we show that the pipeline extracts accurately the central frequency and the large separation. It is also able to identify the degree of the modes in 78 per cent of stars.

    Original languageEnglish (US)
    Pages (from-to)2178-2189
    Number of pages12
    JournalMonthly Notices of the Royal Astronomical Society
    Volume420
    Issue number3
    DOIs
    StatePublished - Mar 1 2012

    Fingerprint

    acoustics
    stars
    solar cycles
    irradiance
    solar cycle
    oscillation
    gravity
    gravitation
    asteroseismology
    oscillations
    signal-to-noise ratio
    photometry
    sun
    signal to noise ratios
    probe
    time series
    modulation
    probes
    parameter
    analysis

    Keywords

    • Methods: statistical
    • Stars: oscillations
    • Techniques: photometric

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Acoustic spectrum fitting for a large set of solar-like pulsators. / Benomar, Othman; Baudin, F.; Chaplin, W. J.; Elsworth, Y.; Appourchaux, T.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 420, No. 3, 01.03.2012, p. 2178-2189.

    Research output: Contribution to journalArticle

    Benomar, O, Baudin, F, Chaplin, WJ, Elsworth, Y & Appourchaux, T 2012, 'Acoustic spectrum fitting for a large set of solar-like pulsators', Monthly Notices of the Royal Astronomical Society, vol. 420, no. 3, pp. 2178-2189. https://doi.org/10.1111/j.1365-2966.2011.20184.x
    Benomar, Othman ; Baudin, F. ; Chaplin, W. J. ; Elsworth, Y. ; Appourchaux, T. / Acoustic spectrum fitting for a large set of solar-like pulsators. In: Monthly Notices of the Royal Astronomical Society. 2012 ; Vol. 420, No. 3. pp. 2178-2189.
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