Search Publications
Homogeneous studies of transiting extrasolar planets - V. New results for 38 planets
Southworth, John
I measure the physical properties of 38 transiting extrasolar planetary systems, bringing the total number studied within the Homogeneous Studies project to 82. Transit light curves are modelled using the jktebop code, with careful attention paid to limb darkening, orbital eccentricity and contaminating light. The physical properties of each syste…
Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
Auvergne, M.; Baudin, F.; Poretti, E. +14 more
Context. OB stars are important building blocks of the Universe, but we have only a limited sample of them well understood enough from an asteroseismological point of view to provide feedback on the current evolutionary models. Our study adds one special case to this sample, with more observational constraints than for most of these stars.
Ai…
Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452
Poretti, E.; Rainer, M.; Samadi, R. +24 more
Context. Be stars are rapidly rotating stars with a circumstellar decretion disk. They usually undergo pressure and/or gravity pulsation modes excited by the κ-mechanism, i.e. an effect of the opacity of iron-peak elements in the envelope of the star. In the Milky Way, p-modes are observed in stars that are hotter than or equal to the B3 spectral …
The rotation of field stars from CoRoT data
Micela, G.; Favata, F.; Affer, L. +1 more
We present period measurements of a large sample of field stars in the solar neighbourhood, observed by the COnvection ROtation and planetary Transits (CoRoT) satellite in two different directions of the Galaxy. The presence of a period was detected using the Lomb-Scargle normalized periodogram technique and the autocorrelation analysis. The asses…
Transiting exoplanets from the CoRoT space mission. XX. CoRoT-20b: A very high density, high eccentricity transiting giant planet
Mazeh, T.; Aigrain, S.; Alonso, R. +43 more
We report the discovery by the CoRoT space mission of a new giant planet, CoRoT-20b. The planet has a mass of 4.24 ± 0.23 MJup and a radius of 0.84 ± 0.04 RJup. With a mean density of 8.87 ± 1.10 g cm-3, it is among the most compact planets known so far. Evolutionary models for the planet suggest a mass of heavy el…
The CoRoT B-type binary HD 50230: a prototypical hybrid pulsator with g-mode period and p-mode frequency spacings⋆
Auvergne, M.; Baudin, F.; Poretti, E. +14 more
Context. B-type stars are promising targets for asteroseismic modelling, since their frequency spectrum is relatively simple.
Aims: We deduce and summarise observational constraints for the hybrid pulsator, HD 50230, earlier reported to have deviations from a uniform period spacing of its gravity modes. The combination of spectra and a high-q…
Pulsation spectrum of δ Scuti stars: the binary HD 50870 as seen with CoRoT and HARPS
Auvergne, M.; Amado, P. J.; Baudin, F. +14 more
Aims: We present the results obtained with the CoRoT satellite for HD 50870, a δ Sct star which was observed for 114.4 d. The aim of these observations was to evaluate the results obtained for HD 50844, the first δ Sct star monitored with CoRoT, on a longer time baseline.
Methods: The 307,570 CoRoT datapoints were analysed with different…
Modelling a high-mass red giant observed by CoRoT
Auvergne, M.; Baudin, F.; Michel, E. +15 more
Context. The advent of space-borne photometers such as CoRoT and Kepler has opened up new fields in asteroseismology. This is especially true for red giants as only a few of these stars were known to oscillate with small amplitude, solar-like oscillations before the launch of CoRoT.
Aims: The G6 giant HR 2582 (HD 50890) was observed by CoRoT …
The needle in the haystack: searching for transiting extrasolar planets in CoRoT stellar light curves
Pätzold, M.; Grziwa, S.; Carone, L.
EXOTRANS is a software package developed by the Department of Planetary Research of the Rheinisches Institut für Umweltforschung (RIU-PF) at Cologne University for detecting transit signals from extrasolar planets in stellar light curves. EXOTRANS is used very successfully by RIU-PF within the CoRoT mission. The software package uses two different…
Strong interactions between g- and p-modes in the hybrid γ Doradus-δ Scuti CoRoT star ID 105733033
Mathias, P.; Debosscher, J.; Chapellier, E. +2 more
Context. The presence of stellar p- and g-modes allows us to test stellar structure models in great detail from the core to the envelope. As the driving mechanisms are not yet fully understood, the first important step is to provide clear evidence of these pulsation modes.
Aims: Recent space missions have confirmed that the γ Doradus and the …