All Figures

$\begin{figure} \par\includegraphics[angle=-90,width=8cm,clip]{2864fig1.eps} \end{figure}$ Figure 1: Radial velocities for a sample of 12 stable stars from the HARPS high-precision programme, observed over about 700 days. For each star, the mean RV has been subtracted. The overall rms of 1.81 m s^-1 is made of different contributions, among which photon noise ( $\sim$ 0.8 m s^-1), calibration noise ( $\sim$ 0.8 m s^-1), guiding errors (0.2-0.6 m s^-1) and stellar acoustic modes (0.5-2.0 m s^-1). Seasonal averages have been computed ( bottom part). The absence of long-term drifts and the dispersion of only 0.64 m s^-1 illustrate the long-term stability of ThAr reference lamps.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{2864fig2.eps} \end{figure}$ Figure 2: CaII H ( $\lambda = 3968.47$ Å) absorption line region for HD 93083 ( top), HD 101930 ( middle) and HD 102117 ( bottom). Reemission peaks are absent or very weak in these three stars, indicating low chromospheric activity.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{2864fig3.eps} \end{figure}$ Figure 3: Phased radial velocities for HD 93083. The best Keplerian fit to the data gives a minimum mass of 0.37 $M_{{\rm Jup}}$ and an orbital period of 143.6 days for the planet.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{2864fig4.eps} \end{figure}$ Figure 4: Phased radial velocities for HD 101930. The planet has a minimum mass of 0.30 $M_{{\rm Jup}}$ and an orbital period of 70.5 days.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{2864fig5.eps} \end{figure}$ Figure 5: Phased radial velocities for HD 102117. The planet has a minimum mass of 0.14 $M_{{\rm Jup}}$ and an orbital period of 20.7 days.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{2864fig2.eps} \end{figure}$	Figure 2: CaII H ( $\lambda = 3968.47$ Å) absorption line region for HD 93083 ( top), HD 101930 ( middle) and HD 102117 ( bottom). Reemission peaks are absent or very weak in these three stars, indicating low chromospheric activity.
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$\begin{figure} \par\includegraphics[width=7.6cm,clip]{2864fig3.eps} \end{figure}$	Figure 3: Phased radial velocities for HD 93083. The best Keplerian fit to the data gives a minimum mass of 0.37 $M_{{\rm Jup}}$ and an orbital period of 143.6 days for the planet.
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$\begin{figure} \par\includegraphics[width=7.6cm,clip]{2864fig4.eps} \end{figure}$	Figure 4: Phased radial velocities for HD 101930. The planet has a minimum mass of 0.30 $M_{{\rm Jup}}$ and an orbital period of 70.5 days.
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$\begin{figure} \par\includegraphics[width=7.6cm,clip]{2864fig5.eps} \end{figure}$	Figure 5: Phased radial velocities for HD 102117. The planet has a minimum mass of 0.14 $M_{{\rm Jup}}$ and an orbital period of 20.7 days.
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