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Detection of Five Brown Dwarfs around Sun-Like Stars

12 Dec 2015, 22:00 UTC
Detection of Five Brown Dwarfs around Sun-Like Stars
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Figure 1: Artist’s impression of a giant planet/brown dwarf.Brown dwarfs are substellar objects with roughly 13 to 80 times the mass of Jupiter. These objects are not massive enough to burn hydrogen in their cores and they span the gap between giant planets and low-mass stars. Bouchy et al. (2015) present the detection of five brown dwarfs with minimum masses between 32 and 83 times the mass of Jupiter. These brown dwarfs orbit Sun-like stars with orbital periods longer than 10 years, and they were detected through radial velocity measurements of Sun-like stars over a relatively long period of roughly 20 years. This discovery doubles the number of known brown dwarfs with orbital periods longer than 10 years.Figure 2: Radial velocity curve of HD10844, a F8V star with 0.98 times the mass of the Sun, located about 170 light years away. The brown dwarf orbiting it has at least 83 times the mass of Jupiter, and its orbit has a period of 32 years and an eccentricity of 0.57. With a minimum mass close to the boundary between the most massive brown dwarfs and the least massive stars, the brown dwarf around HD10844 is quite likely a star and not ...

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