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Title:
A possible dividing line between massive planets and brown-dwarf companions
Authors:
Sahlmann, Johannes; Ségransan, Damien; Queloz, Didier; Udry, Stéphane
Affiliation:
AA(Observatoire de Genève, Université de Genève, 51 Chemin Des Maillettes, 1290 Sauverny, Switzerland. ), AB(Observatoire de Genève, Université de Genève, 51 Chemin Des Maillettes, 1290 Sauverny, Switzerland), AC(Observatoire de Genève, Université de Genève, 51 Chemin Des Maillettes, 1290 Sauverny, Switzerland), AD(Observatoire de Genève, Université de Genève, 51 Chemin Des Maillettes, 1290 Sauverny, Switzerland)
Publication:
The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution, Proceedings of the International Astronomical Union, IAU Symposium, Volume 276, p. 117-120
Publication Date:
11/2011
Origin:
CUP
Keywords:
brown dwarfs, stars: low-mass, binaries: spectroscopic, stars: statistics, techniques: radial velocities, astrometry
Abstract Copyright:
(c) 2011: Copyright © International Astronomical Union 2011
DOI:
10.1017/S1743921311020047
Bibliographic Code:
2011IAUS..276..117S

Abstract

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.

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