Search Publications
Forward seismic modeling of the pulsating magnetic B-type star HD 43317
Aerts, C.; Neiner, C.; Mathis, S. +5 more
The large-scale magnetic fields detected at the surface of about 10% of hot stars extend into the stellar interior, where they may alter the structure. Deep inner regions of stars are only observable using asteroseismology. Here, we investigate the pulsating magnetic B3.5V star
The Gaia-ESO Survey: properties of newly discovered Li-rich giants
Gilmore, G.; Bayo, A.; Recio-Blanco, A. +41 more
Aims: We report 20 new lithium-rich giants discovered within the Gaia-ESO Survey, including the first Li-rich giant with an evolutionary stage confirmed by CoRoT (Convection, Rotation and planetary Transits) data. We present a detailed overview of the properties of these 20 stars.
Methods: Atmospheric parameters and abundances were deriv…
Planets, candidates, and binaries from the CoRoT/Exoplanet programme. The CoRoT transit catalogue
Mazeh, T.; Guterman, P.; Aigrain, S. +31 more
The CoRoT space mission observed 163 665 stars over 26 stellar fields in the faint star channel. The exoplanet teams detected a total of 4123 transit-like features in the 177 454 light curves. We present the complete re-analysis of all these detections carried out with the same softwares so that to ensure their homogeneous analysis. Although the v…
Ejection processes in the young open cluster NGC 2264. A study of the [OI]λ6300Å emission line
Dougados, C.; Bouvier, J.; Alencar, S. H. P. +2 more
Context. Statistical studies of the spectral signatures of jets and winds in young stars are crucial to characterize outflows and understand their impact on disk and stellar evolution. The young, open cluster NGC 2264 contains hundreds of well-characterized classical T Tauri stars (CTTS), being thus an ideal site for these statistical studies. Its…
The envelope of the power spectra of over a thousand δ Scuti stars. The T̅eff - νmax scaling relation
García, R. A.; Roca Cortés, T.; Barceló Forteza, S.
CoRoT and Kepler high-precision photometric data allowed the detection and characterization of the oscillation parameters in stars other than the Sun. Moreover, thanks to the scaling relations, it is possible to estimate masses and radii for thousands of solar-type oscillating stars. Recently, a Δν - ρ relation has been found for δ Scuti stars. No…
Study of a sample of faint Be stars in the exofield of CoRoT. II. Pulsation and outburst events: Time series analysis of photometric variations
Eggenberger, P.; Frémat, Y.; Zorec, J. +5 more
Context. The class of Be stars are the epitome of rapid rotators in the main sequence. These stars are privileged candidates for studying the incidence of rotation on the stellar internal structure and on non-radial pulsations. Pulsations are considered possible mechanisms to trigger mass-ejection phenomena required to build up the circumstellar d…
Light variations due to the line-driven wind instability and wind blanketing in O stars
Krtička, J.; Feldmeier, A.
A small fraction of the radiative flux emitted by hot stars is absorbed by their winds and redistributed towards longer wavelengths. This effect, which leads also to the heating of the stellar photosphere, is termed wind blanketing. For stars with variable winds, the effect of wind blanketing may lead to the photometric variability. We have studie…
Revised Exoplanet Radii and Habitability Using Gaia Data Release 2
Wittenmyer, Robert A.; Horner, Jonathan; Wright, Duncan J. +4 more
Accurate stellar properties are crucial for determining exoplanet characteristics. Gaia DR2 presents revised distances, luminosities, and radii for 1.6 billion stars. Here, we report the calculation of revised radii and densities for 320 non-Kepler exoplanets using this data and present updated calculations of the incident flux received by 690 kno…
A new method for extracting seismic indices and granulation parameters: Results for more than 20,000 CoRoT and Kepler red giants
Michel, E.; Samadi, R.; de Assis Peralta, R.
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 and the parameters characterizing the granulation signature of red giant stars. This method, called MLEUP, takes advantage of the Maximum Likelihood Estimate (MLE) algorithm …
Impact of gaps in the asteroseismic characterization of pulsating stars. I. The efficiency of pre-whitening
Garrido, R.; Moya, A.; Suárez, J. C. +4 more
Context. It is known that the observed distribution of frequencies in CoRoT and Kepler δ Scuti stars has no parallelism with any theoretical model. Pre-whitening is a widespread technique in the analysis of time series with gaps from pulsating stars located in the classical instability strip, such as δ Scuti stars. However, some studies have point…