Characteristics of solar-like oscillations in red giants observed in the CoRoT exoplanet field

By S. Hekker, T. Kallinger, F. Baudin, J. Ridder, C. Barban, F. Carrier, A. Hatzes, W. W. Weiss, A. Baglin. 2009

147 citations recorded by the source corpus.

Observations during the first long run (~150 days) in the exo-planet field of CoRoT increase the number of G-K giant stars for which solar-like oscillations are observed by a factor of 100. This opens the possibility to study the characteristics of their oscillations in a statistical sense. We aim to understand the statistical distribution of the frequencies of maximum oscillation power (nu_max) in red giants and to search for a possible correlation between nu_max and the large separation (delta_nu). The nu_max distribution shows a pronounced peak between 20 - 40 microHz. For about half of the stars we obtain delta_nu with at least two methods. The correlation between nu_max and delta_nu follows the same scaling relation as inferred for solar-like stars. The shape of the nu_max distribution can partly be explained by granulation at low frequencies and by white noise at high frequencies, but the population density of the observed stars turns out to be also an important factor. From the fact that the correlation between delta_nu and nu_max for red giants follows the same scaling relation as obtained for sun-like stars, we conclude that the sound travel time over the pressure scale height of the atmosphere scales with the sound travel time through the whole star irrespective of evolution.

Subfields: Astronomy and Astrophysics, Instrumentation, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/e66ebc604e5435d8e2d4b86334f674d97ca46bc9

How researchers see this paper

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In Astronomy and Astrophysics

1. D. Huber
2. W. Chaplin
3. D. Stello
4. B. Mosser
5. A. Miglio
6. T. Bedding
7. Y. Elsworth
8. D. Charbonneau

In Instrumentation

1. D. Huber
2. W. Chaplin
3. D. Stello
4. B. Mosser
5. T. Bedding
6. A. Miglio
7. Y. Elsworth
8. S. Hekker

In Statistical and Nonlinear Physics

1. D. Huber
2. A. Serenelli
3. S. Basu
4. B. Mosser
5. L. Girardi
6. T. Brown
7. M. Barbieri
8. C. Burke

Citations in the corpus

• On detecting the large separation in the autocorrelation of stellar oscillation times series (2009, methodology): “The maximum oscillation frequency was calculated by Hekker et al. (2009).”
• Determining global parameters of the oscillations of solar-like stars (2009, background): “It has been recently shown, thanks to the CoRoT mission, that they are closely followed for red giants (Hekker et al. 2009; de Ridder et al. 2009) and one of the first goals of the asteroseismic investigation of the Kepler mission will be to check their validity.”
• Galactic archaeology: mapping and dating stellar populations with asteroseismology of red-giant stars (2012, methodology): “A first analysis of these data was made by De Ridder et al. (2009), Hekker et al. (2009) and Kallinger et al. (2010).”
• ASTEROSEISMOLOGY OF RED GIANTS FROM THE FIRST FOUR MONTHS OF KEPLER DATA: GLOBAL OSCILLATION PARAMETERS FOR 800 STARS (2010, methodology): “A breakthrough was achieved by CoRoT with unambiguous detections of radial and non-radial modes in ∼ 800 red giants (De Ridder et al. 2009; Hekker et al. 2009; Carrier et al. 2010).”
• Confirmation of the Gaia DR2 Parallax Zero-point Offset Using Asteroseismology and Spectroscopy in the Kepler Field (2018, background): “Solar-like oscillations have been detected in thousands of evolved stars by the CoRoT and Kepler missions (De Ridder et al. 2009; Hekker et al. 2009; Bedding et al. 2010; Stello et al. 2013; Yu et al. 2018).”
• TESTING SCALING RELATIONS FOR SOLAR-LIKE OSCILLATIONS FROM THE MAIN SEQUENCE TO RED GIANTS USING KEPLER DATA (2011, background): “…that νmax and ∆ν follow a power A2Z - Mathur et al. (2010a), COR - Mosser & Appourchaux (2009); Mosser et al. (2011b), OCT - Hekker et al. (2010b), SYD - Huber et al. (2009). law relation (Stello et al. 2009a; Hekker et al. 2009; Mosser et al. 2010; Hekker et al. 2011b,a): ∆ν = α(νmax/µHz) β .”
• SOLAR-LIKE OSCILLATIONS IN LOW-LUMINOSITY RED GIANTS: FIRST RESULTS FROM KEPLER (2010, background): “The tight correlation in Figure 1 between ∆ν and νmax was discussed by Hekker et al. (2009) and Stello et al. (2009), and is seen here to extend to red giants with much higher νmax.”
• Probing the core structure and evolution of red giants using gravity-dominated mixed modes observed with Kepler (2012, background): “Owing to the unprecedented quality of the CoRoT 10 and Kepler data, many ensemble analyses of red giant oscillations have been performed (e.g. Hekker et al. 2009; Bedding et al. 2010; Mosser et al. 2010; Huber et al. 2010; Kallinger et al. 2010), as well as a few studies dedicated to individual…”
• Oscillating red giants in the CoRoT exofield: asteroseismic mass and radius determination (2008, background): “Hekker et al. (2009) report on the clear detection of solar-type oscillations in several hundreds of red giants among the ∼11 400 stars observed during the first 150 days CoRoT long-run (LRc01) campaign.”
• Spin down of the core rotation in red giants (2012, background): “Important scaling relations have then been shown45 (Hekker et al. 2009) for deriving crucial information on the stellar mass and radius from global seismic parameters (Kallinger et al. 2010).”
• Characterization of the power excess of solar-like oscillations in red giants with Kepler (2011, background): “…which derived first insights on the red giant oscillation spectrum and provided empirical scaling relations between the global seismic parameters (De Ridder et al. 2009; Hekker et al. 2009; Carrier et al. 2010; Bedding et al. 2010; Mosser et al. 2010; Huber et al. 2010; Mosser et al. 2011b).”
• FUNDAMENTAL PROPERTIES OF STARS USING ASTEROSEISMOLOGY FROM KEPLER AND CoRoT AND INTERFEROMETRY FROM THE CHARA ARRAY (2012, background): “…2010; Koch et al. 2010) has increased the number of stars with detected solar-like oscillations to several thousands, providing a large sample spanning from the main-sequence to He-core burning red giant stars (De Ridder et al. 2009; Hekker et al. 2009; Gilliland et al. 2010b; Chaplin et al. 2011).”
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes (2017, methodology): “…that the combination of spectroscopy, asteroseismology, and Gaia has strong potential for constructing empirical 3D reddening maps, in particular, when combined with asteroseismic detections in different regions of the galaxy as provided by CoRoT (Hekker et al. 2009) and K2 (Stello et al. 2017).”
• FUNDAMENTAL PROPERTIES OF KEPLER PLANET-CANDIDATE HOST STARS USING ASTEROSEISMOLOGY (2013, unknown): “…νmax for a large ensemble of Kepler and CoRoT stars and by comparing derived radii and masses to evolutionary tracks and synthetic stellar populations (Hekker et al. 2009; Miglio et al. 2009; Kallinger et al. 2010a; Huber et al. 2010; Mosser et al. 2010; Huber et al. 2011; Silva Aguirre et al.…”
• Red giant masses and ages derived from carbon and nitrogen abundances (2015, unknown): “…(Borucki et al. 2010), and now K2 space missions, solar-like oscillations have been detected in thousands of red giants (e.g. De Ridder et al. 2009; Hekker et al. 2009, 2011; Bedding et al. 2010; Mosser et al. 2010; Stello et al. 2013, 2015), for stars up to 8 kpc from the Sun (Miglio et al.…”
• The universal red-giant oscillation pattern; an automated determination with CoRoT data (2010, methodology): “This is justified by the observation that scaling laws apparently governall global asteroseismic parameters (Hekker et al. 2009; Stello et al. 2009; Bedding et al. 2010a; Mosser et al. 2010) and is equivalent to assume that the underlying physics ofε varies with the global stellar parameters.”
• Red-giant seismic properties analyzed with CoRoT (2010, methodology): “The EACF method and its automated pipeline have been tested on the CoRoT red giants presented by De Ridder et al. (2009) and Hekker et al. (2009), and also on the Kepler red giants (Stello et al., 2010; Bedding et al., 2010).”
• Asteroseismology of Solar-Type and Red-Giant Stars (2013, background): “The long-cadence “exo” observations have yielded asteroseismic datasets of similar length on more than one thousand red giants in the range from roughly 11 ∼< mv ∼< 16.5 (e.g. Hekker et al. 2009, Mosser et al. 2011b), and in several different fields (as we shall discuss later in Section 7).”
• Mixed modes in red-giant stars observed with CoRoT (2011, methodology): “The analysis has been performed on CoRoT red giants previously analyzed in Hekker et al. (2009) and Mosser et al. (2010).”
• Thermohaline instability and rotation-induced mixing - III. Grid of stellar models and asymptotic asteroseismic quantities from the pre-main sequence up to the AGB for low- and intermediate-mass stars of various metallicities (2012, methodology): “…stellar parameters and obtaining additional information about stellar evolution without the need to perform a full asteroseismic analysis (see e.g. Stello et al. 2009; Miglio et al. 2009; Hekker et al. 2009; Mosser et al. 2010; Chaplin et al. 2011b; Beck et al. 2011; Bedding et al. 2011).”