Planet Detection Statistics From the HARPS Low-Precision, Volume Limited Sample, After 8 Years of Data Taking.

Astronomy and Astrophysics – Astronomy

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Scientific paper

The HARPS volume limited sample targets main sequence stars within a shell around Earth from 50pc to 57.5pc. From the still ongoing low precision (2-3m/s) survey started 8 years ago, we detected up to now 46 planets, of which 11 in multiple systems. The giant planet yield from our data is of more than 10% when considering only the stars observed with enough data points to reconstruct an orbit. Among those, 15% show long term drifts which are compatible with a signal from an orbiting companion, and 70% have a large, but yet unexplained radial velocity signal. I will describe the original sample and compare it with the subsample of our target stars with detected planets. Finally I will discuss our detections in the context of all the planet candidates to date.

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