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Results for "Raphaëlle Haywood"
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A revision of the solar neighbourhood metallicity distributionJul 04 2001We present a revised metallicity distribution of dwarfs in the solar neighbourhood. This distribution is centred on solar metallicity. We show that previous metallicity distributions, selected on the basis of spectral type, are biased against stars with ... More Galactic chemical evolution revisitedJan 08 2014Standard chemical evolution models based on long-term infall are affected by a number of problems, evidenced by the analysis of the most recent data. Among these: (1) models rely on the local metallicity distribution, assuming its shape is valid for the ... More A peculiarity of metal-poor stars with planets ?Apr 18 2008Stars with planets at intermediate metallicities ([-0.7,-0.2] dex) exhibit properties that differ from the general field stars. Thirteen stars with planets reported in this metallicity range belong to the thick disc, while only one planet have been detected ... More A temperate rocky super-Earth transiting a nearby cool starApr 18 2017M dwarf stars, which have masses less than 60 per cent that of the Sun, make up 75 per cent of the population of the stars in the Galaxy . The atmospheres of orbiting Earth-sized planets are observationally accessible via transmission spectroscopy ... More Precise Masses in the WASP-47 SystemSep 29 2017We present precise radial velocity observations of WASP-47, a star known to host a hot Jupiter, a distant Jovian companion, and, uniquely, two additional transiting planets in short-period orbits: a super-Earth in a ~19 hour orbit, and a Neptune in a ... More A Control Forced Concurrent Precursor Method for LES InflowDec 11 2018With the increased application of large eddy simulation techniques, the generation of realistic turbulence at inflow boundaries is crucial for the accuracy of a simulation. The Control Forced Concurrent Precursor Method (CFCPM) proposed in this work combines ... More Sparse Geometric Representation Through Local Shape ProbingDec 07 2016Shape analysis is very often performed by segmenting the shape into smooth surface parts that can be further classified using a set of predefined primitives such as planes, cylinders or spheres. Hence the shape is generally assumed to be manifold and ... More On the distances of planetary nebulaeSep 11 2014Oct 14 2014We reconsider calibration of statistical distance scales for planetary nebulae, examining precision and systematic error for various distance methods used as well as the scales themselves. A different calibration strategy, one based on precise trigonometric ... More Sparse Geometric Representation Through Local Shape ProbingDec 07 2016Nov 02 2017We propose a new shape analysis approach based on the non-local analysis of local shape variations. Our method relies on a novel description of shape variations, called Local Probing Field (LPF), which describes how a local probing operator transforms ... More The Milky Way stellar populations in CFHTLS fieldsNov 02 2011We investigate the characteristics of the thick disk in the Canada - France - Hawaii - Telescope Legacy Survey (CFHTLS) fields, complemented at bright magnitudes with Sloan Digital Sky Survey (SDSS) data. The ([Fe/H], Z) distributions are derived in the ... More Clues to the formation of the Milky Way's thick diskApr 08 2015Apr 10 2015We analyse the chemical properties of a set of solar vicinity stars, and show that the small dispersion in abundances of \alpha-elements at all ages provides evidence that the SFH has been uniform throughout the thick disk. In the context of long time ... More On the origin of the clumpy streams of Palomar 5Feb 06 2013Apr 24 2013In this paper we report a study (see Mastrobuono-Battisti et al., 2012) about the formation and characteristics of the tidal tails around Palomar 5 along its orbit in the Milky Way potential, by means of direct N-body simulations and simplified numerical ... More Clumpy streams in a smooth dark halo: the case of Palomar 5Sep 03 2012Sep 05 2012By means of direct N-body simulations and simplified numerical models, we study the formation and characteristics of the tidal tails around Palomar 5, along its orbit in the Milky Way potential. Unlike previous findings, we are able to reproduce the substructures ... More Hiding its age: the case for a younger bulgeJun 13 2016The determination of the age of the bulge has led to two contradictory results. On the one side, the color-magnitude diagrams in different bulge fields seem to indicate a uniformly old ($>$10 Gyr) population. On the other side, individual ages derived ... More Bar quenching in gas-rich galaxiesSep 11 2017Galaxy surveys have suggested that rapid and sustained decrease in the star-formation rate, "quenching", in massive disk galaxies is frequently related to the presence of a bar. Optical and near-IR observations reveal that nearly 60% of disk galaxies ... More A second terrestrial planet orbiting the nearby M dwarf LHS 1140Aug 01 2018Nov 22 2018LHS 1140 is a nearby mid-M dwarf known to host a temperate rocky super-Earth (LHS 1140 b) on a 24.737-day orbit. Based on photometric observations by MEarth and Spitzer as well as Doppler spectroscopy from HARPS, we report the discovery of an additional ... More An Earth-sized planet with an Earth-like densityOct 30 2013Kepler-78 (KIC 8435766) was identified by Sanchis-Ojeda et al. (2013) as harbouring a transiting planet of 1.16 times the size of the Earth and an orbital period of only 8.5 hours. While the exquisite Kepler photometry was able to determine its radius ... More On the cosmic evolution of the specific star formation rateFeb 09 2015The apparent correlation between the specific star formation rate (sSFR) and total stellar mass (M_star) of galaxies is a fundamental relationship indicating how they formed their stellar populations. To attempt to understand this relation, we hypothesize ... More A new look at the kinematics of the bulge from an N-body modelFeb 21 2016(Abridged) By using an N-body simulation of a bulge that was formed via a bar instability mechanism, we analyse the imprints of the initial (i.e. before bar formation) location of stars on the bulge kinematics, in particular on the heliocentric radial ... More The thick disc of the Galaxy: Sequel of a merging eventApr 26 1995Accurate characterization of thick disc properties from recent kinematic and photometric surveys provides converging evidences that this intermediate population is a sequel of the violent heating of early disc populations by a merging satellite galaxy. ... More Certified counting of roots of random univariate polynomialsDec 04 2014A challenging problem in computational mathematics is to compute roots of a high-degree univariate random polynomial. We combine an efficient multiprecision implementation for solving high-degree random polynomials with two certification methods, namely ... More The echo of the bar buckling: phase-space spirals in Gaia DR2Nov 22 2018Jan 29 2019Using a single N-body simulation ($N=0.14\times 10^9$) we explore the formation, evolution and spatial variation of the phase-space spirals similar to those recently discovered by Antoja et al. in the Milky Way disk, with Gaia DR2. For the first time ... More Metallicity and kinematics of the bar in-situJan 09 2014Constraints on the Galactic bulge/bar structure and formation history from stellar kinematics and metallicities mainly come from relatively high-latitude fields (|b|>4) where a complex mix of stellar population is seen. We aim here to constrain the formation ... More Revisiting the transits of CoRoT-7b at a lower activity levelJul 30 2014CoRoT-7b, the first super-Earth with measured radius discovered, has opened the new field of rocky exoplanets characterisation. To better understand this interesting system, new observations were taken with the CoRoT satellite. During this run 90 new ... More Electroweak PhysicsMar 28 2000We review the prospects for studies in electroweak physics at the LHC. GYES, a multifibre spectrograph for the CFHTSep 19 2010We have chosen the name of GYES, one of the mythological giants with one hundred arms, offspring of Gaia and Uranus, for our instrument study of a multifibre spectrograph for the prime focus of the Canada-France-Hawaii Telescope. Such an instrument could ... More Kepler-21b: A rocky planet around a V = 8.25 magnitude starSep 24 2016HD 179070, aka Kepler-21, is a V = 8.25 F6IV star and the brightest exoplanet host discovered by Kepler. An early detailed analysis by Howell et al. (2012) of the first thirteen months (Q0 - Q5) of Kepler light curves revealed transits of a planetary ... More EPIC 247418783$b$: A rocky super-Earth in a 2.2 day orbitJan 14 2019EPIC 247418783 is a solar-type star with a radius of R_star = 0.899 $\pm$ 0.034 R_sun and mass of M_star=0.934 $\pm$ 0.038 M_sun. From K2 C13 data, we found one super-Earth planet (R_p = 1.589+0.095-0.072 R_Earth) transiting this star on a short period ... More PLATO as it is: a legacy mission for Galactic archaeologyJun 12 2017Jul 07 2017Deciphering the assembly history of the Milky Way is a formidable task, which becomes possible only if one can produce high-resolution chrono-chemo-kinematical maps of the Galaxy. Data from large-scale astrometric and spectroscopic surveys will soon provide ... More