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A Jupiter-mass companion to a solar-type star

The presence of a Jupiter-mass companion to the star 51 Pegasi is inferred from observations of periodic variations in the star’s radial velocity. The companion lies only about eight million kilometres from the star, which would be well inside the orbit of Mercury in our Solar System. This object might be a gas-giant planet that has migrated to this location through orbital evolution, or from the radiative stripping of a brown dwarf.

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Mayor, M., Queloz, D. A Jupiter-mass companion to a solar-type star. Nature 378, 355–359 (1995). https://doi.org/10.1038/378355a0

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