A5042758375- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Advanced Chemical Physics Studies
- Climate variability and models
- Solar Radiation and Photovoltaics
- Geomagnetism and Paleomagnetism Studies
- Spacecraft Design and Technology
- Spectroscopy and Chemometric Analyses
- Scientific Measurement and Uncertainty Evaluation
- Multidisciplinary Science and Engineering Research
- Nuclear physics research studies
- Scientific Research and Discoveries
- Marine and environmental studies
- Space Exploration and Technology
- Rare-earth and actinide compounds
Max Planck Institute for Solar System Research
2018-2021
Centre National de la Recherche Scientifique
2012-2019
Institut d'Astrophysique Spatiale
2015-2019
Université Paris-Sud
2015-2019
Université Paris Cité
2017
Université Paris-Saclay
2017
Laboratoire d’Astrophysique de Marseille
2011-2016
Aix-Marseille Université
2012-2016
Laboratoire de Mathématiques Nicolas Oresme
2013-2014
Laboratoire de Mathématiques
2013-2014
Aims. We report the discovery as well orbital and physical characterizations of two new transiting giant exoplanets, CoRoT-30 b CoRoT-31 b, with CoRoT space telescope. Methods. analyzed complementary data sets: photometric transit light curves measured by CoRoT, radial velocity HARPS spectrometer. To derive absolute masses radii planets, we modeled stars from available magnitudes spectra. Results. find that is a warm Jupiter on close-to-circular 9.06-day orbit around G3V star semi-major axis...
In this paper we report a new transiting warm giant planet: KOI-1257 b. It was first detected in photometry as planet-candidate by the ${\it Kepler}$ space telescope and then validated thanks to radial velocity follow-up with SOPHIE spectrograph. orbits its host star period of 86.647661 d $\pm$ 3 s high eccentricity 0.772 0.045. The planet transits main metal-rich, relatively old binary system stars mass 0.99 0.05 Msun 0.70 $ \pm 0.07 for primary secondary, respectively. This is constrained...
The oscillations of a slowly rotating star have long been classified into spheroidal and toroidal modes. modes include the well-known 5-min acoustic used in helioseismology. Here we report observations Sun's modes, for which restoring force is Coriolis whose periods are on order solar rotation period. By comparing with normal differentially spherical shell, able to identify many observed These high-latitude inertial critical-latitude equatorial Rossby In model, maximum kinetic energy density...
We report the discovery of a new stellar companion in KOI-13 system. is composed by two fast-rotating A-type stars similar magnitude. One these hosts transiting planet discovered Kepler. obtained radial velocity measurements using SOPHIE spectrograph at Observatoire de Haute-Provence that revealed an additional this This has mass between 0.4 and 1 Msun orbits one main with period 65.831 \pm 0.029 days eccentricity 0.52 0.02. The velocities were derived model line profiles. From residuals, we...
We assess the importance of tidal evolution and its interplay with magnetic braking in population hot-Jupiter planetary systems. By minimizing total mechanical energy a given system under constraint stellar angular momentum loss, we rigorously find conditions for existence dynamical equilibrium states. estimate their duration, particular when wind torque spinning down star is almost compensated by it up. introduce dimensionless variables to characterize observed hot Jupiter systems discuss...
The masses and radii of extrasolar planets are key observables for understanding their interior, formation evolution. While transit photometry Doppler spectroscopy used to measure the respectively relative those host star, estimates true values these quantities rely on theoretical models star which known suffer from systematic differences with observations. When a system is composed more than two bodies, extra information contained in radial velocity data. Velocity (finite speed-of-light,...
We report the detection of Doppler shadow transiting hot Jupiter CoRoT-11b. Our analysis is based on line-profile tomography time-series, Keck/HIRES high-resolution spectra acquired during transit planet. measured a sky-projected, spin-orbit angle 0.1 +/- 2.6 degrees, which consistent with very low-inclined orbit respect to stellar rotation axis. refined physical parameters system using Markov chain Monte Carlo simultaneous fitting available photometric and spectroscopic data. An tidal...
We report the discovery of a transiting brown dwarf companion to KOI-205, K0 main-sequence star, in 11.720125-day period orbit. The transits were detected by Kepler space telescope, and reflex motion star was measured using radial velocity observations obtained with SOPHIE spectrograph. atmospheric parameters host stars determined from analysis high-resolution, high signal-to-noise ratio ESPaDOns spectra for this purpose. Together spectrophotometric measurements recovered literature, these...
We report the discovery by CoRoT space mission of a new giant planet, CoRoT-20b. The planet has mass 4.24 ± 0.23 MJup and radius 0.84 0.04 RJup. With mean density 8.87 1.10 g cm-3, it is among most compact planets known so far. Evolutionary models for suggest heavy elements order 800 M⊕ if embedded in central core, requiring revision either formation or both evolution structure models. note however that smaller amounts are expected more realistic which they mixed throughout envelope. orbits...
We report the validation and characterization of three new transiting exoplanets using SOPHIE radial velocities: KOI-614b, KOI-206b, KOI-680b. KOI-614b has a mass $2.86\pm0.35~{\rm M_{Jup}}$ radius $1.13^{+0.26}_{-0.18}~{\rm R_{Jup}}$, it orbits G0, metallic ([Fe/H]=$0.35\pm0.15$) dwarf in 12.9 days. Its are familiar compatible with standard planetary evolution models, so is one few known planets this range to have an orbital period over ten With equilibrium temperature $T_{eq}=1000 \pm 45$...
We present the radial-velocity follow-up of two Kepler planetary transiting candidates (KOI-189 and KOI-686) carried out with SOPHIE spectrograph at Observatoire de Haute Provence. These data promptly discard these objects as viable planet show that are in regime very low-mass stars, where a strong discrepancy between observations models persists for mass radius parameters. By combining spectra light curve photometric measurements found literature, we obtain full characterization companions,...
The objective of this work is to determine what fraction red-giant (RG) stars shows photometric rotational modulation, and understand its origin. One the underlying questions role close binarity in population, standing upon fact that RGs short-period binary systems (<150 days or so) have been observed display strong modulation. We select a sample about 4500 relatively bright by Kepler, show 370 them (8%) Almost all oscillation amplitudes below median sample, while 30 are not oscillating at...
We present the detection and characterization of two new transiting, close-in, giant extrasolar planets KOI-200b KOI-889b. They were first identified by Kepler team as promising candidates from photometry satellite, then we established their planetary nature thanks to radial velocity follow-up jointly secured with spectrographs SOPHIE HARPS-N. Combined analyses whole datasets allow systems be characterized. The planet has mass radius 0.68 +/- 0.09 M_Jup 1.32 0.14 R_Jup; it orbits in 7.34...
Brown dwarfs straddle the mass range transition from planetary to stellar objects. There is a relative paucity of brown companions around FGKM stars compared exoplanets for orbital periods less than few years, but most short-period dwarf fully characterised by transits and radial velocities are found F-type stars. We examine hypothesis that could not survive on close orbit with important convective envelopes because tides angular momentum loss through magnetic breaking should lead rapid...
Kepler-419 is a planetary system discovered by the Kepler photometry which known to harbour two massive giant planets: [...] Here we present new radial velocity (RV) measurements secured over more than years with SOPHIE spectrograph, where both planets are clearly detected. The RV data modelled together using photodynamical model. inclusion of information breaks $MR^{-3}$ degeneracy inherent in timing alone, allowing us measure absolute stellar and radii masses. With uncertainties 12% 13%...