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X. Delfosse
Researcher at Joseph Fourier University
Publications - 101
Citations - 6386
X. Delfosse is an academic researcher from Joseph Fourier University. The author has contributed to research in topics: Planet & Exoplanet. The author has an hindex of 37, co-authored 101 publications receiving 6069 citations. Previous affiliations of X. Delfosse include Institut Universitaire de France.
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Journal ArticleDOI
The HARPS search for southern extra-solar planets - XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD 47 186 and HD 181 433
François Bouchy,Michel Mayor,C. Lovis,Stéphane Udry,Willy Benz,Jean-Loup Bertaux,X. Delfosse,C. Mordasini,Francesco Pepe,D. Queloz,Damien Ségransan +10 more
TL;DR: In this article, the authors reported the detection of two new multiple planet systems orbiting solar-like stars HD 47 186 and HD 181 433, which increased to 20 the number of close-in low-mass exoplanets (below 0.1 M JUP) and strengthen the fact that 80% of these planets are in multiple planetary systems.
Journal ArticleDOI
Large-scale magnetic topologies of late M dwarfs★: Magnetic topologies of late M dwarfs
TL;DR: In this article, the authors presented the first spectropolarimetric survey of a small sample of active M dwarfs, aimed at providing observational constraints on dynamo action on both sides of the full-convection threshold (spectral type M4).
Journal ArticleDOI
Large-scale magnetic topologies of early M dwarfs
Jean-François Donati,Julien Morin,Pascal Petit,X. Delfosse,T. Forveille,Michel Aurière,Remi A. Cabanac,B. Dintrans,Rim Fares,Thomas Gastine,Moira Jardine,François Lignières,Frédéric Paletou,J. C. Ramirez Velez,S. Théado +14 more
TL;DR: In this article, a small sample of stars ranging from spectral type M0 to M8 was used to investigate how dynamo processes operate in stars on both sides of the full convection threshold (spectral type M4).
Journal ArticleDOI
Metallicity of M dwarfs - I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence
TL;DR: In this paper, high-resolution ELODIE and CORALIE spectra were obtained for both components of 20 wide visual binaries composed of an F-, G- or K-dwarf primary and an M dwarf secondary.
Posted Content
The HARPS search for southern extra-solar planets XXXII. Only 4 planets in the Gl~581 system
T. Forveille,X. Bonfils,X. Delfosse,Roi Alonso,Stéphane Udry,François Bouchy,Michaël Gillon,C. Lovis,V. Neves,M. Mayor,Francesco Pepe,D. Queloz,Nuno C. Santos,D. Segransan,J. M. Almenara,Hans J. Deeg,Markus Rabus +16 more
TL;DR: In this paper, the HARPS spectrograph was used to obtain 121 new radial velocity measurements of Gl 581 with the ESO 3.6 m telescope, and analyzed those together with previous 119 measurements of that star to examine these potential additional super-Earth planets.