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A possible dividing line between massive planets and brown-dwarf companions

Published online by Cambridge University Press:  10 November 2011

Johannes Sahlmann
Affiliation:
Observatoire de Genève, Université de Genève, 51 Chemin Des Maillettes, 1290 Sauverny, Switzerland. email: [email protected]
Damien Ségransan
Affiliation:
Observatoire de Genève, Université de Genève, 51 Chemin Des Maillettes, 1290 Sauverny, Switzerland. email: [email protected]
Didier Queloz
Affiliation:
Observatoire de Genève, Université de Genève, 51 Chemin Des Maillettes, 1290 Sauverny, Switzerland. email: [email protected]
Stéphane Udry
Affiliation:
Observatoire de Genève, Université de Genève, 51 Chemin Des Maillettes, 1290 Sauverny, Switzerland. email: [email protected]
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Abstract

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Brown dwarfs are intermediate objects between planets and stars. The lower end of the brown-dwarf mass range overlaps with the one of massive planets and therefore the distinction between planets and brown-dwarf companions may require to trace the individual formation process. We present results on new potential brown-dwarf companions of Sun-like stars, which were discovered using CORALIE radial-velocity measurements. By combining the spectroscopic orbits and Hipparcos astrometric measurements, we have determined the orbit inclinations and therefore the companion masses for many of these systems. This has revealed a mass range between 25 and 45 Jupiter masses almost void of objects, suggesting a possible dividing line between massive planets and sub-stellar companions.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

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