A HARPS RV search for planets around young nearby stars
A. Grandjean, A.-M. Lagrange, M. Keppler, N. Meunier L., Mignon, S. Borgniet, G. Chauvin, S. Desidera F. Galland, S., Messina, M. Sterzik, B. Pantoja, L. Rodet, N. Zicher

TL;DR
This study used HARPS radial velocity measurements to search for planets around 89 young nearby stars, setting upper limits on giant planet occurrence rates despite challenges posed by stellar activity.
Contribution
First comprehensive RV survey of young stars with activity correction, providing new constraints on giant planet occurrence rates at short periods.
Findings
No planetary companions detected in the sample.
Upper limits on giant planet occurrence rate are 2% for periods less than 1000 days.
Detected stellar companions in three systems.
Abstract
Young nearby stars are good candidates in the search for planets with both radial velocity (RV) and direct imaging techniques. This, in turn, allows for the computation of the giant planet occurrence rates at all separations. The RV search around young stars is a challenge as they are generally faster rotators than older stars of similar spectral types and they exhibit signatures of magnetic activity (spots) or pulsation in their RV time series. Specific analyses are necessary to characterize, and possibly correct for, this activity. Our aim is to search for planets around young nearby stars and to estimate the giant planet (GP) occurrence rates for periods up to 1000 days. We used the HARPS spectrograph on the 3.6m telescope at La Silla Observatory to observe 89 A-M young (< 600 Myr) stars. We used our SAFIR (Spectroscopic data via Analysis of the Fourier Interspectrum Radial…
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