Solar-like oscillations with low amplitude   in the CoRoT target HD 181906

García, Rafael A.; Régulo, C.; Samadi, R.; Ballot, J.; Barban, C.; Benomar, O.; Chaplin, W. J.; Gaulme, P.; Appourchaux, T.; Mathur, S.; Mosser, B.; Toutain, T.; Verner, G. A.; Auvergne, M.; Baglin, A.; Baudin, F.; Boumier, P.; Bruntt, H.; Catala, C.; Deheuvels, S.; Elsworth, Y.; Jiménez-Reyes, S. J.; Michel, E.; Hernández, F. Pérez; Roxburgh, I. W.; Salabert, D.

doi:10.1051/0004-6361/200911910

Cited by 103 publications

(121 citation statements)

References 35 publications

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“…Thus, the mode damping is almost negligible during a nine-day run and we estimate the mode amplitude using the pure sine assumption, which causes the maximum mode amplitude to be 49 +8 −10 cm s −1 . The SNR of the detection is similar to the first asteroseismic results for solar-like targets, from data acquired by the CoRoT satellite (Baglin et al 2002), in particular those obtained for HD 181906 (García et al 2009).…”

Section: Discussionsupporting

confidence: 84%

“…l = 1 and l = 2). Oscillating stars also display similar signatures (Appourchaux et al 2008;García et al 2009). However, other effects could a priori cause the measured signal: temperature fluctuations in the interferometer, telescope pointing errors, albedo features on Jupiter, and solar p-modes reflected by Jupiter's atmosphere.…”

Section: Evidence Of Jovian P-modesmentioning

confidence: 91%

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Detection of Jovian seismic waves: a new probe of its interior structure

Gaulme

Schmider

Guillot

et al. 2011

A&A

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115

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Knowledge of Jupiter's deep interior would provide unique constraints on the formation of the Solar System. Measurement of its core mass and global composition would shed light on whether the planet formed by accretion or by direct gravitational collapse. At present, the inner structure of Jupiter is poorly constrained and seismology, which consists of identifying acoustic eigenmodes, offers a way to directly measure its deep sound speed profile, and thus its physical properties. Seismology of Jupiter has been considered since the mid 1970s, but hitherto the various attempts to detect global modes have led, at best, to ambiguous results. We report the detection of global modes of Jupiter, based on radial velocity measurements performed with the SYMPA Fourier spectro-imager. The global seismic parameters that we measure include the frequency of maximum amplitude 1213 ± 50 μHz, the mean large frequency spacing between radial harmonics 155.3 ± 2.2 μHz, and the mode maximum amplitude 49 +8 −10 cm s −1 , all values that are consistent with current models of Jupiter. This result opens the way to the investigation of the inner structure of the Solar System's giant planets based on seismology techniques.

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Section: Discussionsupporting

confidence: 84%

Section: Evidence Of Jovian P-modesmentioning

confidence: 91%

Detection of Jovian seismic waves: a new probe of its interior structure

Gaulme

Schmider

Guillot

et al. 2011

A&A

Self Cite

115

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“…By making severe constraints on the fitting procedure (mode widths and mode heights set equal over the fitted frequency range) values of nine = 0, 1, 2 frequencies were obtained by García et al (2009). These differ from those obtained for a smaller frequency sets (5 n values) obtained by Verner (private communication) with less rigid constraints on the fitting procedure, and are only marginally consistent within the larger formal errors of Verner's analysis.…”

Section: Hd 181906mentioning

confidence: 68%

“…HD 181906 is an F8 (m v = 7.65) star observed by CoRoT for 156 days, that displays very low p-mode power in the frequency range 1000−2500 μHz , García et al 2009; it is considerably fainter than HD 49933 and HD 181420. Figure 16a gives the power spectrum and Fig.…”

Section: Hd 181906mentioning

confidence: 99%

Narrow frequency-windowed autocorrelations as a diagnostic of solar-like stars

Roxburgh

2009

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Aims. This paper investigates the diagnostic potential of narrow, frequency-windowed autocorrelation as a tool for probing the properties of solar-like oscillating stars when the determination of individual frequencies is impossible or is subject to large uncertainties, and when mode identification is difficult. Methods. I use theoretical analysis including phase-shifts, modelling, and data analysis. Results. Narrow-windowed autocorrelation of a time series can reveal the variation with frequency of the large separations Δ(ν) and the half large separations Δ 01 , Δ 10 , thus helping with mode identification. This technique is applied to the CoRoT p-mode oscillators HD 49933, HD 175726, HD 181420, and HD 181906. Theoretical analysis and modelling are presented to illustrate the technique.

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“…The oscillations have tiny amplitudes, and with photometry they can only be revealed with very long high-precision time series from space, e.g. with CoRoT (Baglin 2003;Appourchaux et al 2008;García et al 2009;Deheuvels et al 2010b;Mathur et al 2010a).…”

Section: Introductionmentioning

confidence: 99%

Fundamental properties of fiveKeplerstars using global asteroseismic quantities and ground-based observations

Creevey

Doğan

Frasca

et al. 2012

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We present an asteroseismic study of the solar-like stars KIC 11395018, KIC 10273246, KIC 10920273, KIC 10339342, and KIC 11234888 using short-cadence time series of more than eight months from the Kepler satellite. For four of these stars, we derive atmospheric parameters from spectra acquired with the Nordic Optical Telescope. The global seismic quantities (average large frequency separation and frequency of maximum power), combined with the atmospheric parameters, yield the mean density and surface gravity with precisions of 2% and ∼0.03 dex, respectively. We also determine the radius, mass, and age with precisions of 2-5%, 7-11%, and ∼35%, respectively, using grid-based analyses. Coupling the stellar parameters with photometric data yields an asteroseismic distance with a precision better than 10%. A v sin i measurement provides a rotational period-inclination correlation, and using the rotational periods from the recent literature, we constrain the stellar inclination for three of the stars. An Li abundance analysis yields an independent estimate of the age, but this is inconsistent with the asteroseismically determined age for one of the stars. We assess the performance of five grid-based analysis methods and find them all to provide consistent values of the surface gravity to ∼0.03 dex when both atmospheric and seismic constraints are at hand. The different grid-based analyses all yield fitted values of radius and mass to within 2.4σ, and taking the mean of these results reduces it to 1.5σ. The absence of a metallicity constraint when the average large frequency separation is measured with a precision of 1% biases the fitted radius and mass for the stars with non-solar metallicity (metal-rich KIC 11395018 and metal-poor KIC 10273246), while including a metallicity constraint reduces the uncertainties in both of these parameters by almost a factor of two. We found that including the average small frequency separation improves the determination of the age only for KIC 11395018 and KIC 11234888, and for the latter this improvement was due to the lack of strong atmospheric constraints.

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Solar-like oscillations with low amplitude in the CoRoT target HD 181906

Cited by 103 publications

References 35 publications

Detection of Jovian seismic waves: a new probe of its interior structure

Detection of Jovian seismic waves: a new probe of its interior structure

Narrow frequency-windowed autocorrelations as a diagnostic of solar-like stars

Fundamental properties of fiveKeplerstars using global asteroseismic quantities and ground-based observations

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