Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-22
Astronomy and Astrophysics
Astrophysics
30 pages, 7 figures, chapter to appear in the book "Planets in Binary Star Systems", ed. N. Haghighipour (Springer Publishing
Scientific paper
Although it is commonly agreed that the presence of a close stellar companion is likely to affect planet formation and evolution, the precise effects and their actual impact on planet occurrence and properties are still debated. In particular, observational constraints are sparse, a consequence of the discrimination against close binaries in Doppler planet searches. To bring observational constraints on the occurrence and properties of planets in binaries and multiple stars, we have been conducting two dedicated observing programs using both adaptive optics imaging and radial-velocity monitoring. In this chapter we explain our approach and present preliminary results from these two programs. A simplified statistical analysis of the data from our VLT/NACO imaging survey brings the first observational evidence that the occurrence of planets is reduced in binaries closer than ~120 AU. On the radial-velocity side, current results confirm that the use of two-dimensional correlation allows to search for circumprimary giant planets in many types of spectroscopic binaries. Definitive results from our ongoing planet search in spectroscopic binaries should yield important constraints on the closest binaries susceptible of hosting circumprimary giant planets.
Eggenberger Anne
Udry Stephane
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