Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 683, Issue 1, Pages L63-L66Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/587461
Keywords
planetary systems; techniques : radial velocities
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We announce the discovery of a twin of Jupiter orbiting the slightly metal-poor [Fe/H] = -0.1 (d = 18 pc) G8 dwarf HD 154345. This planet has a minimum mass of 0.95 M-Jup and a 9.2 year, circular orbit with radius 4.2 AU. There is currently little or no evidence for other planets in the system, but smaller or exterior planets cannot yet be ruled out. We also detect a similar to 9 year activity cycle in this star photometrically and in chromospheric emission. We rule out activity cycles as the source of the radial velocity variations by comparison with other cycling late G dwarfs.
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