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Spectroscopic characterisation of microlensing events Towards a new interpretation of OGLE-2011-BLG-0417
A. Santerne, J. -P. Beaulieu, B. Rojas Ayala +14
The microlensing event OGLE-2011-BLG-0417 is an exceptionally bright lens binary that was predicted to present radial velocity variation at the level of several km/s. Pioneer radia…
Is the activity level of HD 80606 influenced by its eccentric planet?
P. Figueira, A. Santerne, A. Suárez Mascareño +14
Aims: Several studies suggest that the activity level of a planet-host star can be influenced by the presence of a close-by orbiting planet. Moreover, the interaction mechanisms th…
CNO behaviour in planet-harbouring stars. I Nitrogen abundances in stars with planets
L. Suárez-Andrés, G. Israelian, J. I. González Hernández +4
Carbon, nitrogen, and oxygen (CNO) are key elements in stellar formation and evolution, and their abundances should also have a significant impact on planetary formation and evolut…
Ret, its debris disk, and its lonely stellar companion Ret. Different trends for different spectra
V. Adibekyan, E. Delgado-Mena, P. Figueira +8
Several studies have reported a correlation between the chemical abundances of stars and condensation temperature (known as Tc trend). Very recently, a strong Tc trend was reported…
Fundamental stellar parameters for selected T-Tauri stars in the Chamaeleon and Rho Ophiuchus star-forming regions
David James, Alicia Aarnio, Alexander Richert +4
We present the results of an optical photometry and high-resolution spectroscopy campaign for a modest sample of X-ray selected stars in the Chamaeleon and Rho Ophiuchus star formi…
The SOPHIE search for northern extrasolar planets IX. Populating the brown dwarf desert
P. A. Wilson, G. Hébrard, N. C. Santos +20
Radial velocity planet search surveys of nearby Solar-type stars have shown a strong deficit of brown dwarf companions within . There is presently no comprehens…