Search Publications
Revisiting CoRoT RR Lyrae stars: detection of period doubling and temporal variation of additional frequencies
Poretti, E.; Baglin, A.; Szabó, R. +7 more
Context. High-precision, space-based photometric missions like CoRoT and Kepler have revealed new and surprising phenomena in classical variable stars. Such discoveries were the period doubling in RR Lyrae stars and the frequent occurrence of additional periodicities some of which can be explained by radial overtone modes, but others are discordan…
Revisiting the transits of CoRoT-7b at a lower activity level
Aigrain, S.; Alonso, R.; Bordé, P. +29 more
The first super-Earth with measured radius discovered was CoRoT-7b and it has opened the new field of rocky exoplanet characterisation. To better understand this interesting system, new observations were taken with the CoRoT satellite. During this run 90 new transits were obtained in the imagette mode. These were analysed together with the previou…
Theoretical power spectra of mixed modes in low-mass red giant stars
Dupret, M. -A.; Samadi, R.; Mosser, B. +3 more
Context. 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 exhibit significant amplitude, both in the core and at the surface of the stars. It opens the possibility of probing the internal structure from their innermost lay…
CoRoT 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk
Aigrain, S.; Bouvier, J.; Lendl, M. +12 more
We present the discovery of CoRoT 223992193, a double-lined, detached eclipsing binary, comprising two pre-main sequence M dwarfs, discovered by the CoRoT space mission during a 23-day observation of the 3 Myr old NGC 2264 star-forming region. Using multi-epoch optical and near-IR follow-up spectroscopy with FLAMES on the Very Large Telescope and …
CoRoT 105906206: a short-period and totally eclipsing binary with a δ Scuti type pulsator
Gandolfi, D.; Hatzes, A. P.; Lehmann, H. +2 more
Aims: Eclipsing binary systems with pulsating components allow determination of several physical parameters of the stars, such as mass and radius, that can be used to constrain the modeling of stellar interiors and evolution when combined with the pulsation properties. We present the results of the study of CoRoT 105906206, an eclipsing binar…
Transiting exoplanets from the CoRoT space mission. XXV. CoRoT-27b: a massive and dense planet on a short-period orbit
Mazeh, T.; Aigrain, S.; Alonso, R. +36 more
Aims: We report the discovery of a massive and dense transiting planet CoRoT-27b on a 3.58-day orbit around a 4.2 Gyr-old G2 star. The planet candidate was identified from the CoRoT photometry, and was confirmed as a planet with ground-based spectroscopy.
Methods: The confirmation of the planet candidate is based on radial velocity obser…
A search for pulsations in the HgMn star HD 45975 with CoRoT photometry and ground-based spectroscopy
Auvergne, M.; Fossati, L.; Poretti, E. +28 more
The existence of pulsations in HgMn stars is still being debated. To provide the first unambiguous observational detection of pulsations in this class of chemically peculiar objects, the bright star
Dynamical star-disk interaction in the young stellar system V354 Monocerotis
Bouvier, J.; Favata, F.; Alencar, S. H. P. +2 more
Aims: The main goal of this work is to characterize the mass accretion and ejection processes of the classical T Tauri star
Methods: In March 2008, photometric and spectroscopic observations of
Transiting exoplanets from the CoRoT space mission. XXVI. CoRoT-24: a transiting multiplanet system
Mazeh, T.; Aigrain, S.; Alonso, R. +48 more
We present the discovery of a candidate multiply transiting system, the first one found in the CoRoT mission. Two transit-like features with periods of 5.11 and 11.76 d are detected in the CoRoT light curve around a main sequence K1V star of r = 15.1. If the features are due to transiting planets around the same star, these would correspond to obj…
HD 51844: An Am δ Scuti in a binary showing periastron brightening
Baudin, F.; Poretti, E.; Michel, E. +12 more
Context. Pulsating stars in binary systems are ideal laboratories to test stellar evolution and pulsation theory, since a direct, model-independent determination of component masses is possible. The high-precision CoRoT photometry allows a detailed view of the frequency content of pulsating stars, enabling detection of patterns in their distributi…