The HARPS survey for southern extra-solar planets

The HARPS search for southern extra-solar planets

We present here the discovery and characterisation of a very light planet around HD 4308. The planet orbits its star in 15.56 days. The circular radial-velocity variation presents a tiny semi-amplitude of 4.1 ms−1 that corresponds to a planetary minimum mass m2 sin i= 14.1 M⊕ (Earth masses). The planet was unveiled by high-precision radial-velocity measurements obtained with the HARPS spectrogr...

Extrasolar planets and brown dwarfs around A–F type stars ? VI. High precision RV survey of early type dwarfs with HARPS

Aims. Systematic surveys to search for exoplanets have been mostly dedicated to solar-type stars sofar. We developed in 2004 a method to extend such searches to earlier A–F type dwarfs and started spectroscopic surveys to search for planets and quantify the detection limit achievable when taking into account the stars properties (Spectral Type, v sin i) and their actual levels of intrinsic vari...

The CORALIE survey for southern extra - solar planets VIII

The CORALIE survey for Southern extra-solar planets

Activity related phenomena can induce radialvelocity variations, which can be very important when dealing with extra-solar planet search programmes requiring highprecision radial-velocity measurements. In this paper we present a new chromospheric activity index, SCOR, based on the Ca ii H line central reemission, and constructed using CORALIE spectra. After one year of measurements, values of S...

The CORALIE survey for southern extra-solar planets

Doppler measurements from the high-resolution CORALIE spectrometer of the stars HD 75289 and HD 130322 reveal 2 new extra-solar giant planets. They are the second and third planetary candidates discovered with CORALIE in less than 1 year, since its installation on the 1.2-m Euler Swiss telescope at La Silla. The minimum mass of the planet around HD 75289 (m2 sin i = 0.42 MJup) is the lightest f...