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20 papers · 2 filters
The HARPS search for southern extra-solar planets: XXVI: Seven new planetary systems
C. Moutou, M. Mayor, G. Lo Curto +10
We are conducting a planet search survey with HARPS since seven years. The volume-limited stellar sample includes all F2 to M0 main-sequence stars within 57.5 pc, where extrasolar…
A Survey of M Stars in the Field of View of Kepler Space Telescope
Mahmoudreza Oshagh, Nader Haghighipour, Nuno C. Santos
M dwarfs constitute more than 70% of the stars in the solar neighborhood. They are cooler and smaller than Sun-like stars and have less-massive disks which suggests that planets ar…
The HARPS search for southern extra-solar planets: XXVIII. Two giant planets around M0 dwarfs
Thierry Forveille, Xavier Bonfils, Gaspare Lo Curto +11
Fewer giants planets are found around M dwarfs than around more massive stars, and this dependence of planetary characteristics on the mass of the central star is an important obse…
Volatiles and refratories in solar analogs: no terrestial planet connection
J. I. Gonzalez Hernandez, G. Israelian, N. C. Santos +4
We have analysed very high-quality HARPS and UVES spectra of 95 solar analogs, 24 hosting planets and 71 without detected planets, to search for any possible signature of terrestia…
Stellar noise and planet detection. II. Radial-velocity noise induced by magnetic cycles
X. Dumusque, C. Lovis, S. Udry +1
For the 451 stars of the HARPS high precision program, we study correlations between the radial-velocity (RV) variation and other parameters of the Cross Correlated Function (CCF).…
Stellar noise and planet detection. I. Oscillations, granulation and sun-like spots
X. Dumusque, N. C. Santos, S. Udry +2
Spectrographs like HARPS can now reach a sub-m/s precision in radial-velocity (RV) (Pepe & Lovis 2008). At this level of accuracy, we start to be confronted with stellar noise prod…