Search Publications
An in-depth study of HD 174966 with CoRoT photometry and HARPS spectroscopy. Large separation as a new observable for δ Scuti stars
Auvergne, M.; Amado, P. J.; Baudin, F. +18 more
Aims: 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 δ Sct star HD 174966, which was observed with the CoRoT satellite. In addition, we searched for a periodic pattern in the frequency spectra with the goal of using it to determine the mean density of th…
CoRoT 102918586: a γ Doradus pulsator in a short-period eccentric eclipsing binary
Gandolfi, D.; Rainer, M.; Montalbán, J. +2 more
Pulsating stars in eclipsing binary systems are powerful tools to test stellar models. Binarity enables us to constrain the pulsating component's physical parameters and this knowledge drastically improves the input physics for asteroseismic studies. The study of stellar oscillations then allows us to improve our understanding of stellar interiors…
Overview of semi-sinusoidal stellar variability with the CoRoT satellite
Baglin, A.; Catelan, M.; Janot-Pacheco, E. +13 more
Context. To date, the CoRoT space mission has produced more than 124 471 light curves. Classifying these curves in terms of unambiguous variability behavior is mandatory for obtaining an unbiased statistical view on their controlling root-causes.
Aims: The present study provides an overview of semi-sinusoidal light curves observed by the CoRo…
γ Doradus pulsation in two pre-main sequence stars discovered by CoRoT
Chaintreuil, S.; Ryabchikova, T.; Fossati, L. +5 more
Context. Pulsations in pre-main sequence stars have been discovered several times within the last years. But nearly all of these pulsators are of δ Scuti-type. γ Doradus-type pulsation in young stars has been predicted by theory, but lack observational evidence.
Aims: We present the investigation of variability caused by rotation and (γ Dorad…
CoRoT 101186644: A transiting low-mass dense M-dwarf on an eccentric 20.7-day period orbit around a late F-star. Discovered in the CoRoT lightcurves
Mazeh, T.; Alonso, R.; Bouchy, F. +10 more
We present the study of the CoRoT transiting planet candidate 101186644, also named LRc01_E1_4780. Analysis of the CoRoT lightcurve and the HARPS spectroscopic follow-up observations of this faint (mV = 16) candidate revealed an eclipsing binary composed of a late F-type primary (Teff = 6090 ± 200 K) and a low-mass, dense lat…
Secondary eclipses in the CoRoT light curves. A homogeneous search based on Bayesian model selection
Deeg, H. J.; Parviainen, H.; Belmonte, J. A.
Aims: We aim to identify and characterize secondary eclipses in the original light curves of all published CoRoT planets using uniform detection and evaluation critetia.
Methods: Our analysis is based on a Bayesian model selection between two competing models: one with and one without an eclipse signal. The search is carried out by mappi…
Regular frequency patterns in the young δ Scuti star HD 261711 observed by the CoRoT and MOST satellites
Auvergne, M.; Chaintreuil, S.; Ryabchikova, T. +14 more
Context. The internal structure of pre-main-sequence (PMS) stars is poorly constrained at present. This could change significantly through high-quality asteroseismological observations of a sample of such stars.
Aims: We concentrate on an asteroseismological study of HD 261711, a rather hot δ Scuti-type pulsating member of the young open clus…
CoRoT 102749568: mode identification in a δ Scuti star based on regular spacings
Auvergne, M.; Guenther, E. W.; Gandolfi, D. +10 more
Context. The high accuracy of space data increased the number of the periodicities determined for pulsating variable stars, but the mode identification is still a critical point in the non-asymptotic regime.
Aims: We use regularities in frequency spacings for identifying the pulsation modes of the recently discovered δ Sct star ID 102749568. …
High-precision CoRoT space photometry and fundamental parameter determination of the B2.5V star HD 48977
Auvergne, M.; Baudin, F.; Michel, E. +10 more
We present the CoRoT light curve of the bright B2.5V star HD 48977 observed during a short run of the mission in 2008, as well as a high-resolution spectrum gathered with the HERMES spectrograph at the Mercator telescope. We use several time series analysis tools to explore the nature of the variations in the light curve. We performed a detailed a…
Transiting exoplanets from the CoRoT space mission. XXIV. CoRoT-25b and CoRoT-26b: two low-density giant planets
Mazeh, T.; Aigrain, S.; Alonso, R. +47 more
We report the discovery of two transiting exoplanets, CoRoT-25b and CoRoT-26b, both of low density, one of which is in the Saturn mass-regime. For each star, ground-based complementary observations through optical photometry and radial velocity measurements secured the planetary nature of the transiting body and allowed us to fully characterize th…