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A new method for extraction of seismic indices and stellar granulation parameters: application to all stars observed by CoRoT and Kepler.
Raphaël Peralta (Observatoire de Paris - LESIA), Réza Samadi (Observatoire de Paris), Eric Michel (Observatoire de Paris)
In the framework of the SPACEInn project, a Stellar Seismic Indices (SSI - http://ssi.lesia.obspm.fr/) database was developed in order to provide oscillations (Δν, νmax, Henv) and granulation (τgran, σgran) characterization for a large set of red-giant type stars, for the stellar community and beyond. For this purpose, we have developed a new method taking advantage of the MLE (maximum likelihood estimate) algorithm combined with the parametrized representation of the red giants pulsation spectrum following the Universal Pattern (Mosser et al. 2011), in order to measure simultaneously the oscillations and the granulation signature. This method has been tested in terms of precision and accuracy, using Monte Carlo simulations. We applied this new method, called MLEUP, to all stars observed by CoRoT and Kepler. In total, we yield seismic indices and granulation parameters for about 5,000 stars for CoRoT and more than 17,000 for Kepler, increasing the number of known red giant observed by Kepler by ∼10%. First, we will briefly present the method and its performances. Then, we will present our results obtained with CoRoT and Kepler dataset.