Search Publications
Improving transit characterisation with Gaussian process modelling of stellar variability
Cabrera, J.; Barros, S. C. C.; Santos, N. C. +4 more
Context. New photometric space missions to detect and characterise transiting exoplanets are focusing on bright stars to obtain high cadence, high signal-to-noise light curves. Since these missions will be sensitive to stellar oscillations and granulation even for dwarf stars, they will be limited by stellar variability. Therefore, it is crucial a…
Transport of angular momentum by stochastically excited waves as an explanation for the outburst of the rapidly rotating Be star HD49330
Neiner, C.; Lee, U.; Mathis, S. +3 more
Context. HD 49330 is an early Be star that underwent an outburst during its five-month observation with the CoRoT satellite. An analysis of its light curve revealed several independent p and g pulsation modes, in addition to showing that the amplitude of the modes is directly correlated with the outburst.
Aims: We modelled the results obtaine…
Study of the low-order Δν-ρ¯ relation for moderately rotating δ Scuti stars and its impact on their characterization
Suárez, J. C.; García Hernández, A.; Rodón, J. R. +1 more
The large separation in the low-radial order regime is considered as a highly valuable observable to derive mean densities of δ Scuti stars, due to its independence with rotation. Up to now, theoretical studies of this Δν- ${\bar{\rho}}$ relation have been limited to 1D non-rotating models and 2D pseudo-evolutionary models. The present work aims a…
Streaming classification of variable stars
Protopapas, P.; Zorich, L.; Pichara, K.
In the last years, automatic classification of variable stars has received substantial attention. Using machine learning techniques for this task has proven to be quite useful. Typically, machine learning classifiers used for this task require to have a fixed training set, and the training process is performed offline. Upcoming surveys such as the…
Is the primary CoRoT target HD 43587 under a Maunder minimum phase?
Barbosa, R.; do Nascimento, J. -D.; Castro, M. +4 more
Context. One of the most enigmatic phenomena related to solar activity is the so-called Maunder minimum phase. It consists in the lowest sunspot count ever registered for the Sun and has not been confirmed for other stars to date. Since the spectroscopic observations of stellar activity at the Mount Wilson Observatory, the solar analog HD 43587 ha…
Transiting exoplanets from the CoRoT space mission. XXIX. The hot Jupiters CoRoT-30 b and CoRoT-31 b
Mazeh, T.; Aigrain, S.; Alonso, R. +31 more
Aims: We report the discovery as well as the orbital and physical characterizations of two new transiting giant exoplanets, CoRoT-30 b and CoRoT-31 b, with the CoRoT space telescope.
Methods: We analyzed two complementary data sets: photometric transit light curves measured by CoRoT, and radial velocity curves measured by the HARPS spect…
Optimized cutting off transit algorithm to study stellar rotation from PLATO mission light curves
Castro, Matthieu; de Almeida, Leandro; Anthony, Francys +4 more
Measuring the stellar rotation of one of the components in eclipsing binaries (EBs) or planetary systems is a challenge task. The difficulty is mainly due to the complexity of analyzing, in the same light curve, the signal from the stellar rotation mixed with the transit signal of a stellar or substellar companion, like a brown dwarf or planet. Th…