... planets

Based on observations collected at the La Silla Observatory, ESO (Chile), with the CORALIE spectrograph at the 1.2-m Euler Swiss telescope.

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... exoplanets

By October 2001, 71 exoplanets were known having minimum masses below 10 $M_{{\rm Jup}}$.

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... systems

See table at http://obswww.unige.ch/~naef/who_discovered_that_planet.html

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... discovered

These two planets were announced with 9 other systems in an ESO Press-release (4th of April 2001), available at http://www.eso.org/outreach/press-rel/pr-2001/pr-07-01.html

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... dip

See Mayor et al. (1980), Pont (1997) or footnote in Santos et al. (2001) for the description of the technique.

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... measurements

The CORALIE individual radial-velocity measurements presented in this paper for both HD28185 and HD213240 are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/379/999

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... signature

The rotational period of the star is much shorter than the observed period in the radial-velocity data. Furthermore, the activity cycle of a solar-type star is not expected to produce amplitudes higher than a few ms^-1 (McMillan et al. 1993).

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... communication)

Note, however, that these constraints are not very strong, since the expected perturbation of a minimum mass planet is around 10^-4 arcsec, i.e., about 10 times lower than the precision of the Hipparcos astrometry (e.g. Halbwachs et al. 2000). The same is true for HD213240 (see below).

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... analysis

This value is very close to the +0.23 derived from a calibration of the CORALIE cross-correlation function surface, further attesting the precision of this calibration.

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