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Hunting for the lowest-mass exoplanets

Published online by Cambridge University Press:  10 November 2011

Francesco Pepe ,
Michel Mayor ,
Christophe Lovis ,
Willy Benz ,
François Bouchy ,
Xavier Dumusque ,
Didier Queloz ,
Nuno C. Santos ,
Damien Ségransan  and
Stéphane Udry
Francesco Pepe
Affiliation:
Observatoire Astronomique de l'Université de Genève, 51, ch. des Maillettes, CH-1290 Versoix, Switzerland, email: Francesco.Pepe@unige.ch
Michel Mayor
Affiliation:
Observatoire Astronomique de l'Université de Genève, 51, ch. des Maillettes, CH-1290 Versoix, Switzerland, email: Francesco.Pepe@unige.ch
Christophe Lovis
Affiliation:
Observatoire Astronomique de l'Université de Genève, 51, ch. des Maillettes, CH-1290 Versoix, Switzerland, email: Francesco.Pepe@unige.ch
Willy Benz
Affiliation:
Physikalisches Institut der Universität Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
François Bouchy
Affiliation:
Institut d'Astrophysique de Paris, 98bis, bd Arago, F-75014 Paris, France
Xavier Dumusque
Affiliation:
Observatoire Astronomique de l'Université de Genève, 51, ch. des Maillettes, CH-1290 Versoix, Switzerland, email: Francesco.Pepe@unige.ch
Didier Queloz
Affiliation:
Observatoire Astronomique de l'Université de Genève, 51, ch. des Maillettes, CH-1290 Versoix, Switzerland, email: Francesco.Pepe@unige.ch
Nuno C. Santos
Affiliation:
Centro de Astrofísica da Universidade do Porto (CAUP), Rua das Estrelas, P-4150-762 Porto, Portugal
Damien Ségransan
Affiliation:
Observatoire Astronomique de l'Université de Genève, 51, ch. des Maillettes, CH-1290 Versoix, Switzerland, email: Francesco.Pepe@unige.ch
Stéphane Udry
Affiliation:
Observatoire Astronomique de l'Université de Genève, 51, ch. des Maillettes, CH-1290 Versoix, Switzerland, email: Francesco.Pepe@unige.ch
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Abstract

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In order to understand general planet characteristics and constrain formation models it is necessary to scan over the widest possible parameter range of discovered systems. Due to detection biases, the domain of very-low mass planets had remained poorly explored. Only with improving measurement precision it has been possible to enter in the sub-Neptune mass range. The HARPS planet search program has been particularly efficient in detecting such ice giants and super earths. The present talk will summarize the obtained results and the characteristics of the low-mass population of exoplanets.

Keywords

techniques: radial velocitiesplanetary systems

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