Determining global parameters of the oscillations of solar-like stars

By S. Mathur, R. García, C. Régulo, O. Creevey, J. Ballot, D. Salabert, T. Arentoft, P. Quirion, W. Chaplin, H. Kjeldsen. 2009

171 citations recorded by the source corpus.

Context. Helioseismology has enabled us to better understand the solar interior, while also allowing us to better constrain solar models. But now is a tremendous epoch for asteroseismology as space missions dedicated to studying stellar oscillations have been launched within the last years (MOST and CoRoT). CoRoT has already proved valuable results for many types of stars, while Kepler, which was launched in March 2009, will provide us with a huge number of seismic data very soon. This is an opportunity to better constrain stellar models and to finally understand stellar structure and evolution. Aims. The goal of this research work is to estimate the global parameters of any solar-like oscillating target in an automatic manner. We want to determine the global parameters of the acoustic modes (large separation, range of excited pressure modes, maximum amplitude, and its corresponding frequency), retrieve the surface rotation period of the star and use these results to estimate the global parameters of the star (radius and mass). Methods. To prepare for the arrival and the analysis of hundreds of solar-like oscillating stars, we have developed a robust and automatic pipeline, which was partially adapted from helioseismic methods. The pipeline consists of data analysis techniques, such as Fast Fourier Transform, wavelets, autocorrelation, as well as the application of minimisation algorithms for stellar-modelling. Results. We apply our pipeline to some simulated lightcurves from the asteroFLAG team and the Aarhus-asteroFLAG simulator, and obtain results that are consistent with the input data to the simulations. Our strategy gives correct results for stars with magnitudes below 11 with only a few 10% of bad determinations among the reliable results. We then apply the pipeline to the Sun and three CoRoT targets. In particular we determine the large separation and radius of the Sun, HD49933, HD181906, and HD181420.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/6437c7b19551f55ab3f7bb21dac84b38523b28fd

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Citations in the corpus

SOLAR-LIKE OSCILLATIONS IN LOW-LUMINOSITY RED GIANTS: FIRST RESULTS FROM KEPLER (2010, result): “Similar results were found using pipelines developed by four other groups (Hekker et al. 2010b; Mosser & Appourchaux 2009; Kallinger et al. 2010; Mathur et al. 2010), and the dotted lines in Figure 1 show the region inside which ∼80% of those measurements lay.”
Asteroseismology of red giants from the first four months of Kepler data: Fundamental stellar parameters (2010, methodology): “The A2Z pipeline (Mathur et al. 2010) uses two different methods to estimate the mass and radius of a star: one based on the scaling laws and the other one that starts with the measurement of∆ν and uses a pre-calculated grid of evolutionary models to obtain an initial guess of the fundamental…”
ASTEROSEISMOLOGY OF RED GIANTS FROM THE FIRST FOUR MONTHS OF KEPLER DATA: GLOBAL OSCILLATION PARAMETERS FOR 800 STARS (2010, methodology): “We have investigated the slope of the power law using amplitudes from four different methods (A2Z, COR, OCT and SYD, see Table 1 for references) and find on average: A650nm ∝ ν −0.8 max .”
The universal red-giant oscillation pattern; an automated determination with CoRoT data (2010, methodology): “Unfortunately, the methods currently used to determine the global oscillation parameters suffer from various sources of uncertainty (Hekker et al. 2009; Huber et al. 2009; Mathur et al. 2010).”
TESTING SCALING RELATIONS FOR SOLAR-LIKE OSCILLATIONS FROM THE MAIN SEQUENCE TO RED GIANTS USING KEPLER DATA (2011, methodology): “…Garćıa et al. (2011) and analyzed using several automated analysis methods (Bonanno et al. 2008; Campante et al. 2010; Hekker et al. 2010b; Huber et al. 2009; Kallinger et al. 2010a; Karoff et al. 2010; Mathur et al. 2010a; Mosser & Appourchaux 2009; Mosser et al. 2011b; Verner & Roxburgh 2011).”
The connection between stellar granulation and oscillation as seen by the Kepler mission (2014, result): “The sample includes stars from the main sequence to high up the giant branch and asymptotic giant branch (compared to the analysis in Mathur et al. 2010, which was restricted to red giants) and therefore basically covers the entire parameter space for which we can expect solar-like oscillations and…”
THE APOKASC CATALOG: AN ASTEROSEISMIC AND SPECTROSCOPIC JOINT SURVEY OF TARGETS IN THE KEPLER FIELDS (2014, methodology): “In total, five data analysis methods - Huber et al. (2009), Hekker et al. (2010), Kallinger et al. (2010), Mathur et al. (2010), and Mosser et al. (2011a) - were used to extract independent estimates of two global asteroseismic parameters from the frequency-power spectrum of the lightcurves.”
Rotation and magnetism of Kepler pulsating solar-like stars : Towards asteroseismically calibrated age-rotation relations (2014, methodology): “…García et al. 2009; Ballot et al. 2011; McQuillan et al. 2013a; Nielsen et al. 2013), which can also lead to a determination of the surface differential rotation (e.g. Barban et al. 2009; Mosser et al. 2009b; Mathur et al. 2010a; Fröhlich et al. 2012; Reinhold & Reiners 2013; Lanza et al. 2014).”
Red giant masses and ages derived from carbon and nitrogen abundances (2015, unknown): “The raw light curves were prepared as described in Garc´ıa et al. (2011), and the seismic parameters ν max and (cid:4)ν were then measured using ﬁve different techniques (Huber et al. 2009; Hekker et al. 2010; Kallinger et al. 2010; Mathur et al. 2010; Mosser et al. 2011).”
Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. I. Oscillation Mode Parameters (2016, methodology): “…because it is often amplitudes from this method that are extracted by automated analysis pipelines (see, e.g., Huber et al. 2009; Hekker et al. 2010; Mathur et al. 2010), and thus used in calibrating scaling relations (see, e.g., Stello et al. 2011; Huber et al. 2011; Corsaro et al. 2013).”
The Second APOKASC Catalog: The Empirical Approach (2018, methodology): “The A2Z pipeline was first described in Mathur et al. (2010) and, together with their method of data preparation is updated in Garcia et al. (2014).”
Red-giant seismic properties analyzed with CoRoT (2010, methodology): “The new analysis that we present in this paper has been made possible by the use of the autocorrelation method (Mosser & Appourchaux, 2009), which is significatively different from what has been used in other works (Mathur et al., 2010b; Hekker et al., 2009; Huber et al., 2009).”