Publications (123)
Spin down of the core rotation in red giants
B. Mosser, M. J. Goupil, K. Belkacem +18
The space mission Kepler provides us with long and uninterrupted photometric time series of red giants. We are now able to probe the rotational behaviour in their deep interiors us…
Modelling a high-mass red giant observed by CoRoT
F. Baudin, C. Barban, M. J. Goupil +15
The G6 giant HR\,2582 (HD\,50890) was observed by CoRoT for approximately 55 days. Mode frequencies are extracted from the observed Fourier spectrum of the light curve. Numerical s…
Mode excitation by turbulent convection in rotating stars. I. Effect of uniform rotation
K. Belkacem, S. Mathis, M. J. Goupil +1
We focus on the influence of the Coriolis acceleration on the stochastic excitation of oscillation modes in convective regions of rotating stars. Our aim is to estimate the asymmet…
Seismic performance
B. Mosser, E. Michel, R. Samadi +4
Asteroseismology is a unique tool that can be used to study the interior of stars and hence deliver unique information for the studiy of stellar physics, stellar evolution, and Gal…
Seismic and spectroscopic characterization of the solar-like pulsating CoRoT target HD 49385
S. Deheuvels, H. Bruntt, E. Michel +16
The star HD 49385 is the first G-type solar-like pulsator observed in the seismology field of the space telescope CoRoT. The satellite collected 137 days of high-precision photomet…
CoRoT high-precision photometry of the B0.5 IV star HD 51756
P. I. Pápics, M. Briquet, M. Auvergne +13
OB stars are important constituents for the ecology of the Universe, and there are only a few studies on their pulsational properties detailed enough to provide important feedback…
The tip of the iceberg: the frequency content of the Delta Sct star HD 50844 from CoRoT space photometry
E. Poretti, L. Mantegazza, M. Rainer +19
It has been suggested that the detection of a wealth of very low amplitude modes in Delta Sct stars was only a matter of signal--to--noise ratio. Access to this treasure, impossibl…
CoRoT's view on variable B8/9 stars: spots versus pulsations: Evidence for differential rotation in HD 174648
P. Degroote, B. Acke, R. Samadi +11
Context. There exist few variability studies of stars in the region in the Hertzsprung-Russell diagram between the A and B-star pulsational instability strips. With the aid of the…
Influence of local treatments of convection upon solar p mode excitation rates
R. Samadi, F. Kupka, M. J. Goupil +2
We compute the rates P at which acoustic energy is injected into the solar radial p modes for several solar models. The solar models are computed with two different local treatment…
Period spacings in red giants IV: Toward a complete description of the mixed-mode pattern
B. Mosser, C. Gehan, K. Belkacem +3
Oscillation modes with a mixed character, as observed in evolved low-mass stars, are highly sensitive to the physical properties of the innermost regions. Measuring their propertie…
Oscillating red giants in the CoRoT exo-field: Asteroseismic mass and radius determination
T. Kallinger, W. W. Weiss, C. Barban +10
Context. Observations and analysis of solar-type oscillations in red-giant stars is an emerging aspect of asteroseismic analysis with a number of open questions yet to be explored.…
PlatoSim: An end-to-end PLATO camera simulator for modelling high-precision space-based photometry
N. Jannsen, J. De Ridder, D. Seynaeve +21
PLAnetary Transits and Oscillations of stars (PLATO) is the ESA M3 space mission dedicated to detect and characterise transiting exoplanets including information from the asterosei…
PLATO: PSF modelling using a microscanning technique
R-M. Ouazzani, J. J. Green, R. Samadi
The PLATO space mission is designed to detect telluric planets in the habitable zone of solar type stars, and simultaneously characterise the host star using ultra high precision p…
Stellar granulation as seen in disk-integrated intensity. II. Theoretical scaling relations compared with observations
R. Samadi, K. Belkacem, H. -G. Ludwig +9
A large set of stars observed by CoRoT and Kepler shows clear evidence for the presence of a stellar background, which is interpreted to arise from surface convection, i.e., granul…
Dipole modes with depressed amplitudes in red giants are mixed modes
B. Mosser, K. Belkacem, C. Pincon +6
Seismic observations have shown that a number of evolved stars exhibit low-amplitude dipole modes, which are referred to as depressed modes. Recently, these low amplitudes have bee…
Non-radial oscillations in the red giant HR7349 measured by CoRoT
F. Carrier, J. De Ridder, F. Baudin +13
Convection in red giant stars excites resonant acoustic waves whose frequencies depend on the sound speed inside the star, which in turn depends on the properties of the stellar in…
A new method for extracting seismic indices and granulation parameters: results for more than 20,000 CoRoT and Kepler red giants
R. de Assis Peralta, R. Samadi, E. Michel
We have developed a new automated method intended to perform the simultaneous - and thus more consistent - measurement of both the seismic indices characterizing the oscillations a…
Solar-like oscillations in a massive star
K. Belkacem, R. Samadi, M. -J. Goupil +15
Seismology of stars provides insight into the physical mechanisms taking place in their interior, with modes of oscillation probing different layers. Low-amplitude acoustic oscilla…
The PLATO Solar-like Light-curve Simulator: A tool to generate realistic stellar light-curves with instrumental effects representative of the PLATO mission
R. Samadi, A. Deru, D. Reese +10
The preparation of science objectives of the ESA's PLATO space mission will require the implementation of hare-and-hound exercises relying on the massive generation of representati…
Stellar granulation as seen in disk-integrated intensity. I. Simplified theoretical modeling
R. Samadi, K. Belkacem, H. -G. Ludwig
The solar granulation is known for a long time to be a surface manifestation of convection. Thanks to the current space-borne missions CoRoT and Kepler, it is now possible to obser…
CoRoT's view of newly discovered B-star pulsators: results for 358 candidate B pulsators from the initial run's exoplanet field data
P. Degroote, C. Aerts, M. Ollivier +18
We search for new variable B-type pulsators in the CoRoT data assembled primarily for planet detection, as part of CoRoT's Additional Programme. We aim to explore the properties of…
Solar-like oscillations with low amplitude in the CoRoT target HD 181906
R. A. Garcia, C. Regulo, R. Samadi +23
Context: The F8 star HD 181906 (effective temperature ~6300K) was observed for 156 days by the CoRoT satellite during the first long run in the centre direction. Analysis of the da…
Numerical constraints on the model of stochastic excitation of solar-type oscillations
R. Samadi, A. Nordlund, R. F. Stein +2
Analyses of a 3D simulation of the upper layers of a solar convective envelope provide constraints on the physical quantities which enter the theoretical formulation of a stochasti…
Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models
R. Samadi, M. J. Goupil, F. Baudin +4
Hydrodynamical, 3D simulations of the outer layers of the Sun and Alpha Cen A are used to obtain constraints on the properties of turbulent convection in such stars. These constrai…
Seismic diagnostics for transport of angular momentum in stars 2. Interpreting observed rotational splittings of slowly-rotating red giant stars
M. J. Goupil, B. Mosser, J. P. Marques +4
Asteroseismology with the space-borne missions CoRoT and Kepler provides a powerful mean of testing the modeling of transport processes in stars. Rotational splittings are currentl…
Non-radial, non-adiabatic solar-like oscillations in RGB and HB stars
M. Grosjean, M. A. Dupret, K. Belkacem +3
CoRoT and Kepler observations of red giants reveal rich spectra of non-radial solar-like oscillations allowing to probe their internal structure. We compare the theoretical spectru…
Amplitudes of solar p modes: modelling of the eddy time-correlation function
K. Belkacem, R. Samadi, M. J. Goupil
Modelling amplitudes of stochastically excited oscillations in stars is a powerful tool for understanding the properties of the convective zones. For instance, it gives us informat…
Effect of local treatments of convection upon the solar p-mode excitation rates
R. Samadi, M. -J. Goupil, Y. Lebreton +2
We compute, for several solar models, the rates P at which the solar radial p modes are expected to be excited. The solar models are computed with two different local treatments of…
Calibration of the mixing-length parameter for the MLT and FST models by matching with COBOLD models
T. Sonoi, H. -G. Ludwig, M. -A. Dupret +5
The CoRoT and Kepler missions provided a wealth of high-quality data for solar-like oscillations. To make the best of such data for seismic inferences, we need theoretical models w…
Seismic analysis of HD43587Aa, a solar-like oscillator in a multiple system
P. Boumier, O. Benomar, F. Baudin +26
Context. The object HD 43587Aa is a G0V star observed during the 145-day LRa03 run of the COnvection, ROtation and planetary Transits space mission (CoRoT), for which complementary…
Asteroseismic analysis of the CoRoT target HD 169392
S. Mathur, H. Bruntt, C. Catala +25
The satellite CoRoT (Convection, Rotation, and planetary Transits) has provided high-quality data for almost six years. We show here the asteroseismic analysis and modeling of HD16…
On posterior probability and significance level: application to the power spectrum of HD49933 observed by CoRoT
T. Appourchaux, R. Samadi, M. -A. Dupret
We emphasize that the mention of the significance level when rejecting the null hypothesis (H0) which assumes that what is observed is pure noise) can mislead one to think that the…
Periodic mass loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD50064
C. Aerts, K. Lefever, A. Baglin +15
We aim to interpret the photometric and spectroscopic variability of the luminous blue variable supergiant HD\,50064 ().CoRoT space photometry and follow-up high-resolution…
Excitation rates of p modes: mass luminosity relation across the HR diagram
R. Samadi, D. Georgobiani, R. Trampedach +3
We compute the rates P at which energy is injected into the p modes for a set of 3D simulations of outer layers of stars. We found that Pmax - the maximum in P - scales as (L/M)^s…
The variability of the CoRoT target HD171834: gamma Dor pulsations and/or activity?
K. Uytterhoeven, P. Mathias, A. Baglin +15
We present the preliminary results of a frequency and line-profile analysis of the CoRoT gamma Dor candidate HD171834. The data consist of 149 days of CoRoT light curves and a grou…
Amplitudes and lifetimes of solar-like oscillations observed by CoRoT* Red-giant versus main-sequence stars
F. Baudin, C. Barban, K. Belkacem +12
Context. The advent of space-borne missions such as CoRoT or Kepler providing photometric data has brought new possibilities for asteroseismology across the H-R diagram. Solar-like…
Theoretical power spectra of mixed modes in low mass red giant stars
M. Grosjean, M. -A. Dupret, K. Belkacem +3
CoRoT and Kepler observations of red giant stars revealed very rich spectra of non-radial solar-like oscillations. Of particular interest was the detection of mixed modes that exhi…
Stochastic excitation of non-radial modes I. High-angular-degree p modes
K. Belkacem, R. Samadi, M. J. Goupil +1
Turbulent motions in stellar convection zones generate acoustic energy, part of which is then supplied to normal modes of the star. Their amplitudes result from a balance between t…
Intrinsic photometric characterisation of stellar oscillations and granulation. Solar reference values and CoRoT response functions
E. Michel, R. Samadi, F. Baudin +3
Context: Measuring amplitudes of solar-like oscillations and the granulation power spectral density constitute two promising sources of information to improve our understanding and…
An in-depth study of HD 174966 with CoRoT photometry and HARPS spectroscopy. Large separation as a new observable for δSct stars
A. GarcÃa Hernández, A. Moya, E. Michel +18
The aim of this work was to use a multi-approach technique to derive the most accurate values possible of the physical parameters of the δSct star HD174966. In addition, we search…
HD 50844: the new look of Delta Sct stars from CoRoT space photometry
E. Poretti, E. Michel, R. Garrido +21
It has also been suggested that the detection of a wealth of very low amplitude modes in Delta Sct stars was only a matter of signal--to--noise ratio. Access to this treasure, impo…
Solar -mode damping rates: insight from a 3D hydrodynamical simulation
K. Belkacem, F. Kupka, R. Samadi +1
Space-borne missions CoRoT and Kepler have provided a rich harvest of high-quality photometric data for solar-like pulsators. It is now possible to measure damping rates for hundre…
Surface-effect corrections for solar-like oscillations using 3D hydrodynamical simulations
T. Sonoi, R. Samadi, K. Belkacem +3
The space-borne missions have provided us with a wealth of high-quality observational data that allows for seismic inferences of stellar interiors. This requires the computation of…
The Corot Book: Chap. V.5/ Extraction of the photometric information : corrections
R. Samadi, F. Fialho, J. E. S. Costa +5
We present here the set of corrections that will be applied to the raw data of the CoRoT mission. The aim is to correct the data for instrumental and environmental perturbations as…
Simu-LC : a Light-Curve simulator for CoRoT
F. Baudin, R. Samadi, T. Appourchaux +1
Simulating the data that a space instrument like COROT will provide might look presomptuous. Indeed, it is certainly, when comparing to previous comparable instruments like IPHIR o…
The underlying physical meaning of the relation
K. Belkacem, M. J. Goupil, M. A. Dupret +4
Asteroseismology of stars that exhibit solar-like oscillations are enjoying a growing interest with the wealth of observational results obtained with the CoRoT and Kepler missions.…
Detection of frequency spacings in the young O-type binary HD 46149 from CoRoT photometry
P. Degroote, M. Briquet, M. Auvergne +15
Using the CoRoT space based photometry of the O-type binary HD46149, stellar atmospheric effects related to rotation can be separated from pulsations, because they leave distinct s…
The CoRoT target HD 49933: 2- Comparison of theoretical mode amplitudes with observations
R. Samadi, H. -G. Ludwig, K. Belkacem +7
From the seismic data obtained by CoRoT for the star HD 49933 it is possible, as for the Sun, to constrain models of the excitation of acoustic modes by turbulent convection. We co…
Open issues in probing interiors of solar-like oscillating main sequence stars 1. From the Sun to nearly suns
M. J. Goupil, Y. Lebreton, J. P. Marques +2
We review some major, open issues in the current modelling of low and intermediate mass, main sequence stars based on seismological studies. In the present paper, the solar case is…
The CoRoT target HD 49933: 1- Role of the metal abundance
R. Samadi, H. -G. Ludwig, K. Belkacem +2
Solar-like oscillations are stochastically excited by turbulent convection at the surface layers of the stars. We study the role of the surface metal abundance on the efficiency of…
HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet
P. Gaulme, S. Deheuvels, W. W. Weiss +13
HD 46375 is known to host a Saturn-like exoplanet orbiting at 0.04 AU from its host star. Stellar light reflected by the planet was tentatively identified in the 34-day CoRoT run a…
The CoRoT target HD175726: an active star with weak solar-like oscillations
B. Mosser, E. Michel, T. Appourchaux +17
Context. The CoRoT short runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report observations of the star HD1757…
Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265
J. Ballot, L. Gizon, R. Samadi +27
The star HD 52265 is a G0V metal-rich exoplanet-host star observed in the seismology field of the CoRoT space telescope from November 2008 to March 2009. The satellite collected 11…
Plaskett's Star: Analysis of the CoRoT photometric data
L. Mahy, E. Gosset, F. Baudin +13
The SRa02 of the CoRoT space mission for Asteroseismology was partly devoted to stars belonging to the Mon OB2 association. An intense monitoring was performed on Plaskett's Star (…
Turbulent eddy-time-correlation in the solar convective zone
K. Belkacem, R. Samadi, M. J. Goupil +3
Theoretical modeling of the driving processes of solar-like oscillations is a powerful way of understanding the properties of the convective zones of solar-type stars. In this fram…
Glitches in solar-like oscillating F-type stars: Theoretical signature of the base of the convective envelope on the ratios
M. Deal, M. -J. Goupil, M. S. Cunha +7
The transition between convective and radiative stellar regions is still not fully understood. The sharp variations in sound speed located in these transition regions give rise to…
An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry
M. Briquet, C. Aerts, A. Baglin +13
The O9V star HD 46202, which is a member of the young open cluster NGC 2244, was observed by the CoRoT satellite in October/November 2008 during a short run of 34 days. From the ve…
Period spacings in red giants II. Automated measurement
M. Vrard, B. Mosser, R. Samadi
The space missions CoRoT and Kepler have provided photometric data of unprecedented quality for asteroseismology. A very rich oscillation pattern has been discovered for red giants…
CoRoT observations of O stars: diverse origins of variability
R. Blomme, M. Briquet, P. Degroote +26
Six O-type stars were observed continuously by the CoRoT satellite during a 34.3-day run. The unprecedented quality of the data allows us to detect even low-amplitude stellar pulsa…
A closure model with plumes II. Application to the stochastic excitation of stellar p modes
K. Belkacem, R. Samadi, M. -J. Goupil +2
Our goal is to improve the theoretical modelling of stochastic excitation of p modes by turbulent convection. With the help of the closure model with plume (CMP) developed in a com…
HD 203608, a quiet asteroseismic target in the old galactic disk
B. Mosser, S. Deheuvels, E. Michel +5
A short observing run with the spectrometer Harps at the ESO 3.6-m telescope was conducted in order to continue exploring the asteroseismic properties of F type stars. In fact, Dop…
Pulsations in the late-type Be star HD 50209 detected by CoRoT
P. D. Diago, J. Gutierrez-Soto, M. Auvergne +22
The presence of pulsations in late-type Be stars is still a matter of controversy. It constitutes an important issue to establish the relationship between non-radial pulsations and…
Looking for pulsations in HgMn stars through CoRoT lightcurves
G. Alecian, M. Gebran, M. Auvergne +4
HgMn Chemically Peculiar stars are among the quietest stars of the main-sequence. However, according to theoretical predictions, these stars could have pulsations related to the ve…
Seismic diagnostics on stellar convection treatment from oscillation amplitudes of p-modes
R. Samadi, M. J. Goupil, Y. Lebreton +2
The excitation rate P of solar p-modes is computed with a model of stochatic excitation which involves constraints on the averaged properties of the solar turbulence. These constra…
Damping rates of solar-like oscillations across the HR diagram. Theoretical calculations confronted to CoRoT and Kepler observations
K. Belkacem, M. A. Dupret, F. Baudin +3
Space-borne missions CoRoT and {\it Kepler} are providing a rich harvest of high-quality constraints on solar-like pulsators. Among the seismic parameters, mode damping rates remai…
Stochastic excitation of acoustic modes in stars
R. Samadi
For more than ten years, solar-like oscillations have been detected and frequencies measured for a growing number of stars with various characteristics (e.g. different evolutionary…
Mixed modes in red giants: a window on stellar evolution
B. Mosser, O. Benomar, K. Belkacem +18
The detection of oscillations with a mixed character in subgiants and red giants allows us to probe the physical conditions in their cores. With these mixed modes, we aim at determ…
Variability in the CoRoT photometry of three hot O-type stars. HD 46223, HD 46150 and HD 46966
R. Blomme, L. Mahy, C. Catala +15
The detection of pulsational frequencies in stellar photometry is required as input for asteroseismological modelling. The second short run (SRa02) of the CoRoT mission has provide…
Differential asteroseismic study of seismic twins observed by CoRoT; Comparison of HD 175272 with HD 181420
N. Ozel, B. Mosser, M. A. Dupret +12
The CoRoT short asteroseismic runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report the observation and modeli…
Mixed modes in red-giant stars observed with CoRoT
B. Mosser, C. Barban, J. Montalban +15
The CoRoT mission has provided thousands of red-giant light curves. The analysis of their solar-like oscillations allows us to characterize their stellar properties. Up to now, the…
Amplitudes of solar-like oscillations in red-giant stars: Evidences for non-adiabatic effects using CoRoT observations
R. Samadi, K. Belkacem, M. -A. Dupret +5
A growing number of solar-like oscillations has been detected in red giant stars thanks to CoRoT and Kepler space-crafts. The seismic data gathered by CoRoT on red giant stars allo…
On the seismic scaling relations and
K. Belkacem, R. Samadi, B. Mosser +2
Scaling relations between asteroseismic quantities and stellar parameters are essential tools for studying stellar structure and evolution. We will address two of them, namely, the…
Detecting false positives with PLATO using double-aperture photometry and centroid shifts
F. Gutiérrez-Canales, R. Samadi, A. Birch +6
PLATO will discover exoplanets around Sun-like stars through transit photometry and characterize their host stars using asteroseismology. Since photometry for most PLATO targets wi…
The universal red-giant oscillation pattern; an automated determination with CoRoT data
B. Mosser, K. Belkacem, M. J. Goupil +12
The CoRoT and Kepler satellites have provided thousands of red-giant oscillation spectra. The analysis of these spectra requires efficient methods for identifying all eigenmode par…
Stochastic excitation of nonradial modes II. Are solar asymptotic gravity modes detectable?
K. Belkacem, R. Samadi, M. J. Goupil +3
Detection of solar gravity modes remains a major challenge to our understanding of the innerparts of the Sun. Their frequencies would enable the derivation of constraints on the co…
The PLATO Simulator: modelling of high-precision high-cadence space-based imaging
P. Marcos-Arenal, W. Zima, J. De Ridder +8
Many aspects of the design trade-off of a space-based instrument and its performance can best be tackled through simulations of the expected observations. The complex interplay of…
Characterizing the dynamic properties of the solar turbulence with 3-D simulations: Consequences in terms of p-mode excitation
R. Samadi, A. Nordlund, R. F. Stein +2
A 3D simulation of the upper part of the solar convective zone is used to derive constraints about the averaged and dynamic properties of solar turbulent convection. Theses constra…
Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis
M. Castro, F. Baudin, O. Benomar +8
Solar analogues are important stars to study for understanding the properties of the Sun. Evolutionary modeling, combined with seismic and spectroscopic analysis, becomes a powerfu…
Stellar oscillations. II The non-adiabatic case
R. Samadi, K. Belkacem, T. Sonoi
A leap forward has been performed due to the space-borne missions, MOST, CoRoT and Kepler. They provided a wealth of observational data, and more precisely oscillation spectra, whi…
Transiting exoplanets from the CoRoT space mission VIII. CoRoT-7b: the first Super-Earth with measured radius
A. Leger, D. Rouan, J. Schneider +51
We report the discovery of very shallow (DF/F = 3.4 10-4), periodic dips in the light curve of an active V = 11.7 G9V star observed by the CoRoT satellite, which we interpret as du…
Hydrodynamical simulations of convection-related stellar micro-variability. II. The enigmatic granulation background of the COROT target HD49933
H. -G. Ludwig, R. Samadi, M. Steffen +6
Local-box hydrodynamical model atmospheres provide statistical information about a star's emergent radiation field which allows one to predict the level of its granulation-related…
A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry
O. Benomar, F. Baudin, T. L. Campante +18
Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since…
Period-luminosity relations in evolved red giants explained by solar-like oscillations
B. Mosser, W. A. Dziembowski, K. Belkacem +8
Solar-like oscillations in red giants have been investigated with CoRoT and Kepler, while pulsations in more evolved M giants have been studied with ground-based microlensing surve…
Low-amplitude rotational modulation rather than pulsations in the CoRoT B-type supergiant HD 46769
C. Aerts, S. Simon-Diaz, C. Catala +16
{We aim to detect and interpret photometric and spectroscopic variability of the bright CoRoT B-type supergiant target HD\,46769 (). We also attempt to detect a magnetic fi…
Asymptotic and measured large frequency separations
B. Mosser, E. Michel, K. Belkacem +7
With the space-borne missions CoRoT and Kepler, a large amount of asteroseismic data is now available. So-called global oscillation parameters are inferred to characterize the larg…
Red-giant seismic properties analyzed with CoRoT
B. Mosser, K. Belkacem, M. J. Goupil +10
The CoRoT 5-month long observation runs give us the opportunity to analyze a large variety of red-giant stars and to derive fundamental stellar parameters from their asteroseismic…
Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
P. I. Pápics, M. Briquet, A. Baglin +14
Context. OB stars are important building blocks of the Universe, but we have only a limited sample of them well understood enough from an asteroseismological point of view to provi…
Inferring mode inertias in evolved solar-like stars
O. Benomar, K. Belkacem, T. R. Bedding +7
Asteroseismology of evolved solar-like stars is experiencing a growing interest due to the wealth of observational data from space-borne instruments such as the \emph{CoRoT} and \e…
CoRoT measures solar-like oscillations and granulation in stars hotter than the Sun
E. Michel, A. Baglin, M. Auvergne +2
Oscillations of the Sun have been used to understand its interior structure. The extension of similar studies to more distant stars has raised many difficulties despite the strong…
Excitation of solar-like oscillations across the HR diagram
R. Samadi, D. Georgobiani, R. Trampedach R. +3
We extend semi-analytical computations of excitation rates for solar oscillation modes to those of other solar-like oscillating stars to compare them with recent observations. Nume…
Asteroseismic analysis of the CoRoT δ-Scuti star HD174936
A. GarcÃa Hernández, A. Moya, E. Michel +13
We present an analysis of the δ-Scuti star object HD 174936 (ID 7613) observed by CoRoT during the first short run SRc01 (27 days). A total number of 422 frequencies we are extrac…
HD 174884: a strongly eccentric, short-period early-type binary system discovered by CoRoT
C. Maceroni, J. Montalban, E. Michel +12
Accurate photometric CoRoT space observations of a secondary seismological target, HD 174884, led to the discovery that this star is an astrophysically important double-lined eclip…
Numerical 3D constraints on convective eddy time-correlations : consequences for stochastic excitation of solar p modes
R. Samadi, A. Nordlund, R. F. Stein +2
A 3D simulation of the upper part of the solar convective zone is used to obtain information on the frequency component, chi_k, of the correlation product of the turbulent velocity…
Surface structure of the CoRoT CP2 target star HD 50773
T. Lüftinger, H. -E. Fröhlich, W. Weiss +15
We compare surface maps of the chemically peculiar star HD 50773 produced with a Bayesian technique and based on high quality CoRoT photometry with those derived from rotation phas…
Oscillations in Procyon A: First results from a multi-site campaign
S. Hekker, T. Arentoft, H. Kjeldsen +45
Procyon A is a bright F5IV star in a binary system. Although the distance, mass and angular diameter of this star are all known with high precision, the exact evolutionary state is…
HD 51106 and HD 50747: an ellipsoidal binary and a triple system observed with CoRoT
N. Dolez, S. Vauclair, E. Michel +13
We present an analysis of the observations of HD 51106 and HD 50747 by the satellite CoRoT, obtained during its initial run, and of the spectroscopic preparatory observations. AIMS…
Influence of metallicity on the near-surface effect on oscillation frequencies
L. Manchon, K. Belkacem, R. Samadi +4
The CoRoT and Kepler missions have provided high-quality measurements of the frequency spectra of solar-like pulsators, enabling us to probe stellar interiors with a very high degr…
The solar-like CoRoT target HD 170987: spectroscopic and seismic observations
S. Mathur, R. A. Garcia, C. Catala +22
The CoRoT mission is in its third year of observation and the data from the second long run in the galactic centre direction are being analysed. The solar-like oscillating stars th…
Predicted asteroseismic detection yield for solar-like oscillating stars with PLATO
M. J. Goupil, C. Catala, R. Samadi +26
We determine the expected yield of detections of solar-like oscillations for the PLATO ESA mission. We used a formulation from the literature to calculate the probability of detect…
Solar-like oscillation amplitudes and line-widths as a probe for turbulent convection in stars
R. Samadi, K. Belkacem, M. -J. Goupil +2
Excitation of solar-like oscillations is attributed to turbulent convection and takes place at the upper-most part of the outer convective zones. Amplitudes of these oscillations d…