Search Publications
CSI 2264: Probing the inner disks of AA Tauri-like systems in NGC 2264
Aigrain, S.; Dougados, C.; Bouvier, J. +20 more
Context. The classical T Tauri star (CTTS) AA Tau has presented photometric variability that was attributed to an inner disk warp, caused by the interaction between the inner disk and an inclined magnetosphere. Previous studies of the young cluster NGC 2264 have shown that similar photometric behavior is common among CTTS.
Aims: The goal of t…
Transiting exoplanets from the CoRoT space mission⋆. XXVIII. CoRoT-33b, an object in the brown dwarf desert with 2:3 commensurability with its host star
Mazeh, T.; Aigrain, S.; Alonso, R. +32 more
We report the detection of a rare transiting brown dwarf with a mass of 59 MJup and radius of 1.1 RJup around the metal-rich, [Fe/H] = +0.44, G9V star CoRoT-33. The orbit is eccentric (e = 0.07) with a period of 5.82 d. The companion, CoRoT-33b, is thus a new member in the so-called brown dwarf desert. The orbital period is w…
Stellar cycles from photometric data: CoRoT stars
Catelan, M.; Ferreira Lopes, C. E.; De Medeiros, J. R. +3 more
Context. Until a few years ago, the amplitude variation in the photometric data had been explored to a limited extent mainly because of time resolution and photometric sensitivity limitations. This investigation is now possible thanks to the Kepler and CoRoT databases which provide a unique set of data for studying the nature of stellar variabilit…
MIARMA: A minimal-loss information method for filling gaps in time series. Application to CoRoT light curves
Garrido, R.; Suárez, J. C.; Pascual-Granado, J.
Context. Gaps in time series cause spurious frequencies in the power spectra. In light curves of pulsating stars, this hampers identifying the theoretical oscillation modes. When these gaps are smaller than the total time span, the commonly used approach to overcome these difficulties involves linear interpolation. The original frequency content o…
BEER analysis of Kepler and CoRoT light curves. III. Spectroscopic confirmation of seventy new beaming binaries discovered in CoRoT light curves
Mazeh, T.; Tal-Or, L.; Faigler, S.
Context. The BEER algorithm searches stellar light curves for the BEaming, Ellipsoidal, and Reflection photometric modulations that are caused by a short-period companion. These three effects are typically of very low amplitude and can mainly be detected in light curves from space-based photometers. Unlike eclipsing binaries, these effects are not…
Transiting exoplanets from the CoRoT space mission. XXVII. CoRoT-28b, a planet orbiting an evolved star, and CoRoT-29b, a planet showing an asymmetric transit
Mazeh, T.; Aigrain, S.; Alonso, R. +50 more
Context. We present the discovery of two transiting extrasolar planets by the satellite CoRoT.
Aims: We aim at a characterization of the planetary bulk parameters, which allow us to further investigate the formation and evolution of the planetary systems and the main properties of the host stars.
Methods: We used the transit light curve …
The variability behaviour of CoRoT M-giant stars⋆
Baglin, A.; Paz-Chinchón, F.; Janot-Pacheco, E. +8 more
Context. For six years the Convection, Rotation, and planetary Transits (CoRoT) space mission has been acquiring photometric data from more than 100 000 point sources towards and directly opposite the inner and outer regions of the Galaxy. The high temporal resolution of the CoRoT data, combined with the wide time span of the observations, enabled…
Rotation period distribution of CoRoT and Kepler Sun-like stars
Pasquini, L.; Baglin, A.; Janot-Pacheco, E. +9 more
Aims: We study the distribution of the photometric rotation period (Prot), which is a direct measurement of the surface rotation at active latitudes, for three subsamples of Sun-like stars: one from CoRoT data and two from Kepler data. For this purpose, we identify the main populations of these samples and interpret their main bias…
Stellar rotation, binarity, and lithium in the open cluster IC 4756
Strassmeier, K. G.; Weber, M.; Granzer, T. +3 more
Context. An important aspect in the evolutionary scenario of cool stars is their rotation and the rotationally induced magnetic activity and interior mixing. Stars in open clusters are particularly useful tracers for these aspects because of their known ages.
Aims: We aim to characterize the open cluster IC 4756 and measure stellar rotation p…
The CoRoT chemical peculiar target star HD 49310
Paunzen, E.; Weiss, W. W.; Fröhlich, H. -E. +2 more
Context. The magnetic chemically peculiar (CP) stars of the upper main sequence are well-suited laboratories for investigating the influence of local magnetic fields on the stellar surface because they produce inhomogeneities (spots) that can be investigated in detail as the star rotates.
Aims: We studied the inhomogeneous surface structure o…