Four new wide binaries among exoplanet host stars

Details Four new wide binaries among exoplanet host stars Four new wide binaries among exoplanet host stars

2005-07-05

arxiv.org/abs/astro-ph/0507101v1

Astronomy and Astrophysics

Astrophysics

10 pages, 16 figures, A&A accepted

Scientific paper

10.1051/0004-6361:20042297

In our ongoing survey for wide (sub)stellar companions of exoplanet host stars we have found 4 new co-moving stellar companions of the stars HD114729, HD16141, HD196050 and HD213240 with projected separations from 223 up to 3898AU. The companionship of HD114729B, HD196050B and HD213240C is confirmed by photometry and spectroscopy, all being early M dwarfs. The masses of the detected companions are derived from their infrared JHK magnitudes and range between 0.146 and 0.363 Msun. Our first and second epoch observations can rule out additional stellar companions around the primaries from ~200 up to ~2400 AU (S/N=10). In our survey we have found so far 6 new binaries among the exoplanet host stars. According to these new detections, the reported differences between single-star and binary-star planets with orbital periods short than 40 days remain significant in both the mass-period and eccentricity-period distribution. In contrast, all exoplanets with orbital periods longer than 100 days tend to display similar distributions.

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