The HARPS search for southern extra-solar planets: XXXIII. Super-Earths around the M-dwarf neighbors Gl 433 and Gl 667C

M dwarfs have often been found to have super-Earth planets with short orbital periods. These stars are thus preferential targets in searches for rocky or ocean planets in the solar neighborhood. Our research group recently announced the discovery of one and two low-mass planets around the M1.5V star...

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Published in:Astronomy and astrophysics (Berlin) 2013-05, Vol.553, p.1-15
Main Authors: Delfosse, X, Bonfils, X, veille, T, Udry, S, Mayor, M, Bouchy, F, Gillon, M, Lovis, C, Neves, V, Pepe, F, Perrier, C, Queloz, D, Santos, N C, Segransan, D
Format: Article
Language:English
Subjects:
Astrophysics
Correlation
Extrasolar planets
Orbitals
Planetary systems
Planets
Sciences of the Universe
Searching
Spectrographs
Stars
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Summary:M dwarfs have often been found to have super-Earth planets with short orbital periods. These stars are thus preferential targets in searches for rocky or ocean planets in the solar neighborhood. Our research group recently announced the discovery of one and two low-mass planets around the M1.5V stars Gl 433 and Gl 667C, respectively. We found these planets with the HARPS spectrograph on the ESO 3.6-m telescope at La Silla Observatory, from observations obtained during the guaranteed time observing program of that instrument. We obtained additional HARPS observations of those two stars, for a total of 67 and 179 radial velocity measurements for Gl 433 and Gl 667C, respectively, and present here an orbital analysis of these extended data sets and our main conclusions about both planetary systems. This reinforces the recent conclusion that the occurrence of super-Earth planets does not strongly correlate with the stellar metallicity.
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361/201219013