Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2009-07-05
ASP Conf.Ser.398:179,2008
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
4 pages, 3 figures, in Proceedings of the conference "Extreme Solar Systems", ASP Conference Series, Eds. D. Fischer, F. A. Ra
Scientific paper
The presence of a stellar companion closer than ~100 AU is likely to affect planet formation and evolution. Yet, the precise effects and their actual impact on planet occurrence are still debated. To bring observational constraints, we have conducted with VLT/NACO a systematic adaptive optics survey for close stellar companions to 130 solar-type stars with and without planets. In this paper we present observational and preliminary statistical results from this survey. Observational results reveal about 20 true companions, of which 4 are new companions to planet-host stars. As to preliminary statistical results, they suggest that circumstellar giant planets are less frequent in binaries closer than ~100 AU than around single stars, in possible agreement with the theoretical studies that predict a negative impact of stellar duplicity on giant planet formation in binaries closer than ~100 AU. These statistical results will need confirmation, however, as they are severely limited by small sample sizes.
Beuzit Jean Luc
Chauvin Gael
Eggenberger Anne
Lagrange Anne Marie
Mayor Marcel
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