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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