22 Result(s)
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Article
Erratum to: “Exoplanet discoveries with the CoRoT space observatory”
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Article
Exoplanet discoveries with the CoRoT space observatory
The CoRoT space observatory is a project which is led by the French space agency CNES and leading space research institutes in Austria, Brazil, Belgium, Germany and Spain and also the European Space Agency ESA...
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Chapter and Conference Paper
Exoplanets: The Road to Earth Twins
Recent HARPS discoveries have demonstrated that very quiet stars exist, with intrinsic radial-velocity variations below 1 m s−1. These results allow us in particular to characterize an emerging new population of ...
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Chapter and Conference Paper
From ESPRESSO to CODEX
CODEX and ESPRESSO are concepts for ultra-stable, high-resolution spectrographs at the E-ELT and VLT, respectively. Both instruments are well motivated by distinct sets of science drivers. However, ESPRESSO wi...
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Chapter and Conference Paper
Abundance Trends with Condensation Temperature in Planet-harbouring Stars: Hints of Pollution?
We present the [X/H] trends as a function of the elemental condensation temperature Tc in 88 planet-host stars and in a volume-limited comparison sample of 33 dwarfs without detected planetary companions. We g...
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Chapter and Conference Paper
Transiting Planets: Follow the FLAMES...
The identification of transiting planets candidates and their a posteriori confirmation and characterization by means of spectroscopic follow-up is allowing us to study the internal physics of these planets. H...
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Chapter and Conference Paper
Spectroscopic Parameters for a Sample of Metal-rich Solar-type Stars
We present stellar parameters and metallicities for a sample of 64 high metal content stars not known to harbor any planet. This sample provides the reference for investigating new correlations between stars a...
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Chapter and Conference Paper
Codex
Many talks in this conference have shown the power of high resolution spectroscopy, coupled to high precision. A new spectrograph, fed by an Extremely Large Telescope, will have such a huge collecting power th...
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Chapter and Conference Paper
Planet Detection Around M Dwarfs: New Constraints on Planet Formation Models
The dependence of planetary statistics on the physical conditions during the initial stages of the system (i.e. in the proto-planetary disk) represent an essential constraint on planetary formation mechanisms....
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Chapter and Conference Paper
Pushing Down the Limits of the Radial Velocity Technique
We present results from the first three years of operations of the HARPS spectrograph installed on the ESO-3.6m telescope at La Silla Observatory, Chile. This instrument, primarily built to detect extrasolar p...
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Chapter and Conference Paper
Extrasolar Planets in Double and Multiple Stellar Systems
About 60% of G and K dwarfs belong to double or multiple stellar systems, making these a common environment in which planets may form. Despite this, close binaries have often been rejected from radial-velocity...
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Chapter and Conference Paper
High-resolution Spectroscopy of Faint Stars with Transiting Planets
We present a series of studies based on high-resolution UVES/VLT spectroscopy of several faint stars for which a transit by a giant planet has been detected. The spectra were used to derive accurate stellar pa...
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Chapter and Conference Paper
The HARPS Project
To pursue a competitive programme in the domain of extra-solar planet search, ESO proposed to build HARPS (High-Accuracy Radial-velocity Planetary Search), a new high-resolution spectrograph to be installed on...
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Chapter and Conference Paper
Extrasolar Planets in the Southern Hemisphere: The CORALIE Survey
We are conducting a large survey to detect extrasolar planets by high precision Doppler spectroscopy using the new swiss Euler telescope and the spetrograph CORALIE. The sample includes 1600 nearby G and K sta...
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Chapter and Conference Paper
The CORALIE Planet-Search Sample
This short contribution presents a description of the CORALIE sample selection of more than 1600 dwarf stars for the planet-search programme on the 1.2-m Euler Swiss telescope at La Silla. The instrumentation,...
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Article
Local Stars as Tracers of Galactic Evolution
We describe the overall properties of a new catalogue of metallicities, ages, and galactic orbits for a large, complete sample of F and G dwarfs in the solar neighbourhood. Based on a magnitude-limited sample ...
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Chapter and Conference Paper
Hipparcos Subdwarfs and Globular Cluster Ages: Towards Reliable Absolute Ages
The maximum age of galactic globular clusters provides the best obser-vational constraint on the minimum age of the Universe. One of the main ”missing link” in the globular cluster age determination has been t...
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Chapter and Conference Paper
Mass Determination of Very Low Mass Stars
We discuss the precision achieved with the present observing techniques for the mass determination of low and very low mass stars. We show the gain that will be achieved with high precision radial velocity mea...
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Chapter
Rotational Velocities of Stars in Open Clusters: The Time Dependence Revisited
Using well defined rotational velocity distributions of G-type stars in the Hyades + Praesepe and Pleiades clusters, we have reexamined the age dependence of stellar rotation. The shape of the Vsini distributi...
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Chapter
Rotational Discontinuity of Evolved Stars: What Interpretation ?
A systematic survey of about 2000 evolved stars has been carried out with the CORAVEL spectrometer to determine rotational velocities with a precision of about 1.0 km/s. As a result, the behaviour of the V sini d...
