Thierry Forveille

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A decade ago, the detection of the first transiting extrasolar planet provided a direct constraint on its composition and opened the door to spectroscopic investigations of extrasolar planetary atmospheres. Because such characterization studies are feasible only for transiting systems that are both nearby and for which the planet-to-star radius ratio is(More)
Although stars form from clouds of gas and dust, there are insignificant amounts of gas around ordinary (Sun-like) stars. This suggests that hydrogen and helium, the primary constituents of planets such as Jupiter and Saturn, are not easily retained in orbit as a star matures. The gas-giant planets in the Solar System must therefore have formed rapidly.(More)
  • M.-R. Cioni, C. Loup, +15 authors T. Le Bertre
We have compiled the near infrared Point Source Catalogue (PSC) towards the Magellanic Clouds (MCs) extracted from the data obtained with the Deep Near Infrared Survey of the Southern Sky – DENIS (Epchtein et al. 1997). The catalogue covers an area of of 19.87 × 16 square degrees centered on (α, δ) = (5h27m20s,−69◦00′00′′) for the Large Magellanic Cloud(More)
We measured the radii of 7 low and very low-mass stars using long baseline interferometry with the VLTI interferometer and its VINCI and AMBER near-infrared recombiners. We use these new data, together with literature measurements, to examine the luminosityradius and mass-radius relations for K and M dwarfs. The precision of the new interferometric radii(More)
We report the first astrometrically determined mass of an extrasolar planet, a companion previously detected by Doppler spectroscopy. Radial velocities first provided an ephemeris with which to schedule a significant fraction of the HST observations near companion periand apastron. The astrometry residuals at these orbital phases exhibit a systematic(More)
We report millimeter line observations of CO, 13CO, SiO, SiC2, CN, HCN, HNC, HCO+, CS, and HC3N to study the chemistry in planetary nebulae (PNe) withmassive envelopes of molecular gas. The sample observed consists of representative objects at different stages of development in order to investigate evolutionary effects: the proto-PNe CRL 2688 and CRL 618,(More)
We present preliminary results of a new quasar survey being undertaken with multi-colour optical imaging from the Canada-France-Hawaii Telescope. The current data consists of 3.83 sq. deg. of imaging in the i and z filters to a 10σ limit of z < 23.35. Near-infrared photometry of 24 candidate 5.7 < z < 6.4 quasars confirms them all to be low mass stars(More)
In this paper we report a refined determination of the orbital parameters and the detection of the Rossiter-McLaughlin effect of the recently discovered transiting exoplanet HAT-P-2b. The large orbital eccentricity and short orbital period of this exoplanet are unexpected and distinguish it from other known transiting exoplanets. We performed high precision(More)