Search Publications
CoRoT Reveals a Magnetic Activity Cycle in a Sun-Like Star
Metcalfe, Travis S.; García, Rafael A.; Mathur, Savita +4 more
The 11-year activity cycle of the Sun is a consequence of a dynamo process occurring beneath its surface. We analyzed photometric data obtained by the CoRoT space mission, showing solarlike oscillations in the star HD49933, for signatures of stellar magnetic activity. Asteroseismic measurements of global changes in the oscillation frequencies and …
Determining global parameters of the oscillations of solar-like stars
García, R. A.; Chaplin, W. J.; Kjeldsen, H. +7 more
Context. Helioseismology has enabled us to better understand the solar interior, while also allowing us to better constrain solar models. But now is a tremendous epoch for asteroseismology as space missions dedicated to studying stellar oscillations have been launched within the last years (MOST and CoRoT). CoRoT has already proved valuable result…
Red-giant seismic properties analyzed with CoRoT
Auvergne, M.; Goupil, M. -J.; Baudin, F. +10 more
Context. The CoRoT 5-month long observation runs provide us with the opportunity to analyze a large variety of red-giant stars and derive their fundamental parameters from their asteroseismic properties.
Aims: We perform an analysis of more than 4600 CoRoT light curves to extract as much information as possible. We take into account the chara…
Accretion dynamics and disk evolution in NGC 2264: a study based on CoRoT photometric observations
Aigrain, S.; Bouvier, J.; Teixeira, P. S. +6 more
Context. The young cluster NGC 2264 was observed with the CoRoT satellite for 23 days uninterruptedly in March 2008 with unprecedented photometric accuracy. We present the first results of our analysis of the accreting population belonging to the cluster as observed by CoRoT.
Aims: We search for possible light curve variability of the same na…
Oscillating red giants in the CoRoT exofield: asteroseismic mass and radius determination
Deleuil, M.; Goupil, M. -J.; Baudin, F. +10 more
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. Although stochastic oscillations have previously been detected in red giants from both radial velocity and photometric measurements, those data were either too short or…
Detection of the ellipsoidal and the relativistic beaming effects in the CoRoT-3 lightcurve
Mazeh, T.; Faigler, S.
CoRoT-3b is a 22 Jupiter-mass massive-planet/brown-dwarf object, orbiting an F3-star with a period of 4.3 days. We analyzed the out-of-transit CoRoT-3 red-channel lightcurve obtained by the CoRoT mission and detected the ellipsoidal modulation, with half the orbital period and an amplitude of 59 ± 9 ppm (parts per million), and the relativistic be…
Properties of starspots on CoRoT-2
Alonso, R.; Barge, P.; Lanza, A. F. +1 more
Context. As a planet eclipses its parent star, a dark spot on the surface of the star may be occulted, causing a detectable variation in the light curve.
Aims: We study these light curve variations during transits and infer the physical characteristics of the stellar spots.
Methods: A total of 77 consecutive transit light curves of CoRoT…
A transiting giant planet with a temperature between 250K and 430K
Mazeh, T.; Aigrain, S.; Alonso, R. +58 more
Of the over 400 known exoplanets, there are about 70 planets that transit their central star, a situation that permits the derivation of their basic parameters and facilitates investigations of their atmospheres. Some short-period planets, including the first terrestrial exoplanet (CoRoT-7b), have been discovered using a space mission designed to …
The solar-like CoRoT target HD 170987: spectroscopic and seismic observations
Auvergne, M.; García, R. A.; Chaplin, W. J. +22 more
Context. 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 that have been observed up to now have given some interesting results, specially concerning the amplitudes that are lower than predicted. We present here the resu…
First CoRoT light curves of RR Lyrae stars. Complex multiplet structure and non-radial pulsation detections in V1127 Aquilae
Auvergne, M.; Poretti, E.; Baglin, A. +14 more
Context. The CoRoT - Convection Rotation and planetary Transits - space mission is a great opportunity for monitoring stars with excellent time-sampling and unprecedented photometric precision for up to 150 days. As an important benefit, high-quality RR Lyrae light curves are obtained with a quasi-uninterrupted coverage over several pulsation and …